Hardware and Installation Manual

Transcription

Outdoor Modular Solar Inverter - HEC-UL & HEC-UL+ Series
Outdoor Modular Solar Inverter – HEC-UL & HEC-UL+ Series
HEC_v2
Edition: September 2014
FSMTHW05EI Rev. E
FREESUN HEC-UL & HEC-UL+ SERIES
POWER ELECTRONICS
About this guide
PURPOSE
This manual contains important instructions for the installation and maintenance of Power Electronics
FREESUN HEC-UL and HEC-UL+ inverters.
INTENDED USERS
This manual is intended for qualified customers who will install, operate and maintain Power
Electronics FREESUN HEC-UL inverters.
Only trained electricians approved by the responsible energy supply company may
install and commission the inverters. The instructions assume that the installer is
familiar with electrical installation rules and regulations.
REFERENCE MANUALS
The following reference guides are available for the Freesun Inverters:


Freesun Programming and Software Manual.
Freesun Hardware and Installation Manual.
POWER ELECTRONICS CONTACT INFORMATION
Power Electronics USA Inc.
th
505 Montgomery Street, 11 Floor
San Francisco
CA 94111
UNITED STATES OF AMERICA
US Sales: 1-415-874-3668
Fax: (415) 874-3001
Email: [email protected]
Website: www.power-electronics.us
2
POWER ELECTRONICS
SAFETY SYMBOLS
Always follow safety instructions to prevent accidents and potential hazards from occurring.
WARNINGS IN THIS DOCUMENT
WARNING
CAUTION
The warning symbol indicates conditions or actions that could result in
personal injury or death. A qualifier, such as “Hazardous Voltage”, may
follow the warning title.
The Caution symbol Identifies conditions or actions that could result in
damage to the inverter or equipment. Particular attention should be given
because dangerous voltage may be present. Maintenance operation should
be done by qualified personnel.
SAFETY SYMBOLS
3
POWER ELECTRONICS
Revision History
Date
Revision
Description
13 / 03 / 2013
14 / 01 / 2014
14 / 03 / 2014
06 / 06 / 2014
A
B
C
D
24 / 09 / 2014
E
First Edition
HEC_V2
Disconnecting Unit
Disconnecting Unit, Important Safety Instructions, Technical
Characteristics
Inverter dimensions without Disconnecting Unit
The equipment and technical documentation are periodically updated. Power Electronics reserves the right to modify all or part of the
contents of this manual without previous notice. To consult the most updated information of this product you might access through our
website www.power-electronics.us where the latest version of this manual can be downloaded.
4
POWER ELECTRONICS
TABLE OF CONTENTS
About this guide.........................................................................................................................
Purpose ..................................................................................................................................
Intended Users .......................................................................................................................
Reference Manuals ................................................................................................................
Power Electronics Contact Information ..................................................................................
Safety Symbols ......................................................................................................................
Revision History .....................................................................................................................
2
2
2
2
2
3
4
IMPORTANT SAFETY INSTRUCTIONS .....................................................................................
Important ................................................................................................................................
Safety Standards ....................................................................................................................
Personal Protection Equipment (PPE) Requirements ............................................................
Operator Safety ......................................................................................................................
Integrated Electrical Safety Features .....................................................................................
System Repair and Troubleshooting ......................................................................................
Lockout / Tagout.....................................................................................................................
Ground Fault Warning ............................................................................................................
Marks, Symbols and Controls on the inverter .........................................................................
7
7
8
8
8
12
12
12
13
13
1.
INTRODUCTION ....................................................................................................................
15
2.
CONFIGURATION TABLE & STANDARD RATINGS ..........................................................
2.1. Configuration Table ......................................................................................................
2.2. Standard ratings ...........................................................................................................
16
16
17
3.
TECHNICAL CHARACTERISTICS .......................................................................................
3.1. Environmental Specifications .......................................................................................
3.2. Control Interface Specifications ....................................................................................
3.3. Undervoltage, Overvoltage and Frequency Ride Through Characteristics ..................
3.4. Freesun 390Vac, 1000Vdc, 300kVA to 1250kVA .........................................................
3.7. Freesun 208Vac, 600Vdc, 160kVA to 640kVA .............................................................
3.8. Operational Diagram ....................................................................................................
19
19
19
19
20
21
22
23
24
4.
DIMENSIONS AND WEIGHTS ..............................................................................................
4.1. HEC-UL+ Series .........................................................................................................
4.2. HEC-UL Series ...........................................................................................................
4.3. HEC-UL Series with External Disconnecting Unit .......................................................
25
25
26
27
5.
HANDLING, TRANSPORTATION AND INSTALLATION .....................................................
5.1. Delivery and Storage ....................................................................................................
5.2. Handling and Transportation ........................................................................................
5.3. Installation requirements ..............................................................................................
5.4. Suggested Foundations ...............................................................................................
5.5. Disconnecting Unit Assembly for HEC-UL Inverters ....................................................
5.6. Cooling System ............................................................................................................
5.7. Noise Levels.................................................................................................................
28
28
28
31
32
33
34
36
6.
WIRING ACCESS AND CONNECTIONS ..............................................................................
6.1. Ground connection .......................................................................................................
6.2. DC connections ............................................................................................................
6.2.1 DC connection for HEC-UL+ Inverters .....................................................................
6.2.2 DC connection for HEC-UL Inverters .......................................................................
6.3. AC connection ..............................................................................................................
6.4. Overvoltage protections ...............................................................................................
6.5. Ground Fault protections ..............................................................................................
6.6. Main circuit protections.................................................................................................
6.7 Installation protection ...................................................................................................
6.8. Auxiliary Power Source ................................................................................................
6.9. External Control Connections.......................................................................................
6.9. Control connection .......................................................................................................
37
37
39
39
41
43
45
46
46
47
48
49
49
INDEX
5
POWER ELECTRONICS
7.
COMMISSIONING .................................................................................................................
7.1. Initial Conditions ...........................................................................................................
7.2. First Time Switch On ....................................................................................................
7.3. Switch Off .....................................................................................................................
51
51
51
53
8.
PREVENTIVE MAINTENANCE .............................................................................................
54
Figure 0.1 Inverter controls .............................................................................................................. 14
Figure 1.1 General view of the frame 3 FREESUN HEC-UL+ Series inverter .................................15
Figure 3.1 Operational Diagram HEC-UL & HEC-UL+ Series.......................................................... 24
Figure 4.1 HEC-UL+ Frame 3 .......................................................................................................... 25
Figure 4.2 HEC-UL Frame 3 ............................................................................................................ 26
Figure 4.3 HEC-UL Frame 3 with external Disconnecting Unit ........................................................ 27
Figure 5.1 Inverter crane transport recommendations [mm/in] ........................................................ 29
Figure 5.2 Disconnecting Unit crane transport recommendations ................................................... 30
Figure 5.3 Floor fixation [mm/in]....................................................................................................... 31
Figure 5.4 Inverter clearances [mm/in] ............................................................................................. 31
Figure 5.5 Assembly kit.................................................................................................................... 33
Figure 5.6 Cabinet assembly kit connections ................................................................................... 33
Figure 5.7 Connection busbars fixation ............................................................................................ 34
Figure 5.8 Mating flange connection ................................................................................................ 34
Figure 5.9 Cooling system ............................................................................................................... 34
Figure 5.10 Filter clean/replacement ................................................................................................ 35
Figure 5.11 Filter clean/replacement ................................................................................................ 35
Figure 6.1 PE connections [mm/in] .................................................................................................. 38
Figure 6.2 HEC-UL+ DC cables access ........................................................................................... 39
Figure 6.3 DC input connection in the Disconnecting Unit module .................................................. 40
Figure 6.4 HEC-UL DC cables access [mm/in] ................................................................................ 41
Figure 6.5 DC input connection in the Disconnecting Unit cabinet................................................... 42
Figure 6.6 AC module cabinet cables access .................................................................................. 43
Figure 6.7 AC output connection busbars [mm/in] ........................................................................... 44
Figure 6.8 DC overvoltage protection .............................................................................................. 45
Figure 6.9 Control wiring restrictions................................................................................................ 49
Figure 6.10 Control terminals for the user ........................................................................................ 50
Figure 7.1 FREESUN internal view. Inverter modules rear view (left), front view (center) and AC
module (right) ................................................................................................................................... 52
6
POWER ELECTRONICS
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important instructions for FREESUN HEC-UL and HEC-UL+ by Power Electronics
that shall be followed during installation and maintenance of the solar inverter.
IMPORTANT!
Read this manual carefully to maximize the performance of this product and to ensure its safe use and
installation.
In order to properly use the FREESUN inverter, follow all instructions described in the installation manual
referred to transport, installation, electrical connection and commissioning of the equipment.
Power Electronics accepts no responsibility or liability for any and all damage resulting from inappropriate
use of the equipment.
The information contained in the installation guide must be observed when installing the inverter.
WARNING
The Freesun inverter system presents a SHOCK HAZARD. Read and retain the Installation Manual for
future reference. Before installing the Freesun inverter, read all instructions, cautionary markings and other
appropriate sections of this manual. Failure to follow these warnings could result in severe shock or even
death. Exercise extreme caution at all times to prevent possible accidents.
These instructions are not meant to cover every safety situation nor replace any local or site specific safety
procedure. The information in this section is intended as a supplement to local or site specific procedures.
Power Electronics does not assume responsibility for the compliance or noncompliance of any code,
national or local of the proper installation of the Freesun inverter. A potential for personal injury and/or
equipment damage exists if the electrical codes and these instructions are not followed.
CAUTION
Adhere to local site regulation.
Perform all electrical work in accordance with local, national and/or international electrical codes.
Use insulate tools to reduce the chance of short-circuits while working with the equipment.
Keep all doors closed during equipment operation.
Always follow proper lockout/tagout procedures.
7
POWER ELECTRONICS
SAFETY STANDARDS
The following standards apply to the components:






UL-1741 – UL (Underwriters Laboratory) Standard for Safety for Inverters, Converters, Charge
Controllers, and Interconnection System Equipment (ISE) for Us in Utility Interactive (grid
connected) Power Systems.
IEEE-1547.
IEEE-519 IEEE Recommended Practices and Requirements for Harmonic Control in Electric
Power Systems.
NEC (National Electric Code)/NFPA-70E.
CSA 22.2 No.107.1-01.
CSA 22.1-12.
PERSONAL PROTECTION EQUIPMENT (PPE) REQUIREMENTS
PPE is required for repair and maintenance of a Freesun inverter. PPE includes but is not limited to:







Hard Hat.
Safety Glasses.
100% cotton, long pants (no shorts, no synthetic materials).
Electrical Hazard (EH) rated safety shoes.
Leather work gloves.
FR long sleeve shirt, no synthetic materials.
Ear protection.
Refer to OSHA 29CFR 1910.137 for Personal Protection Equipment (PPE) for working with high voltage
electrical equipment.
OPERATOR SAFETY
CAUTION
The inverter operates at a high voltage (1,000Vdc maximum). Do not touch the DC input terminals
or cables. Touching the DC terminals may result in personal injury or death.
The system has sufficient energy to sustain an arc flash. De-energize the equipment prior to any
maintenance procedure. Always wear Personal Protective Equipment (PPE) while maintaining
equipment that is exposed and energized. Always use insulated tools. Always follow proper
lockout/tagout procedures. Operating or maintaining energized equipment without appropriate PPE
and insulated tools and without following proper lockout/tagout procedures may result in personal injury
or death.
8
POWER ELECTRONICS
WARNING
Do not remove the protective panels except for periodic inspections or wiring, even if the input
power is not applied. Otherwise, you may access the charged circuits and get an electric shock.
Do not open the doors while the inverter is working.
Otherwise, you may get an electric shock.
Do not open the doors when it is raining or when humidity exceeds 95%.
Otherwise, you may get an electric shock and the equipment could be damaged.
Operate the switches with dry hands.
Do not use cables with damaged insulation.
Do not subject the cables to abrasions, excessive stress, heavy loads or pinching.
CAUTION
Install the inverter on a non-flammable surface. Do not place flammable material nearby.
Otherwise, fire could occur.
Disconnect the input power if the solar inverter gets damaged.
Otherwise, it could result in a secondary accident or fire.
After the input power is applied or removed, the inverter will remain hot for a couple of minutes.
Touching internal hot parts may result in skin burns.
Do not apply power to a damaged inverter or to an inverter with parts missing even if the
installation is complete.
Do not allow lint, paper, wood chips, dust, metallic chips or other foreign matter into the inverter.
Otherwise, fire or accident could occur.
9
POWER ELECTRONICS
CAUTION
SAFETY












Before operating the solar inverter, read this manual thoroughly to gain an understanding of the
unit. If any doubt exists then please contact POWER ELECTRONICS, (1-415-874-3668) or
your nearest agent.
Handle the solar inverter with care according to its weight.
Install the inverter according to the instructions within this manual.
Do not place heavy objects on the inverter.
Ensure that the mounting orientation is correct.
Do not drop the inverter or subject it to impact.
The Freesun inverters contain static sensitive printed circuits boards. Use static safety
procedures when handling these boards.
Avoid installing the inverter in conditions that differ from those described in the Technical
Characteristics section.
The cabinet doors must only be opened for commissioning, maintenance and troubleshooting,
as well as for data query and parameter setting.
The device is equipped with several fans for cooling. To perform any work on the fans is
required that the equipment is switched off as explained in the correspondent section. This
procedure should be taken into account for commissioning, maintenance and repair work.
The device fans and the power unit create significant levels of operating noise. In addition to
this, a fault in the device can lead to very high sound levels. We recommend the use of ear
protection when in the vicinity of the device for extended periods.
Immediately after isolating the device, depending on the operating conditions, certain
components can be very hot (e. g. fuses, transformer core, sine wave filter, heatsinks, etc.).
Safety gloves should always be worn when working near components that can be expected to
be very hot. We recommend using safety gloves and glasses during all work on the inverter.
TRIAL RUN


Verify all parameters before operating the inverter.
Always apply voltage and current signals to each terminal that are within levels indicated in this
manual. Otherwise, damage to the inverter may result.
OPERATION PRECAUTIONS

10
Do not modify or alter anything within the inverter.
POWER ELECTRONICS
CAUTION
SPECIAL HAZARDS OF PHOTOVOLTAIC SYSTEMS
Photovoltaic systems have special characteristics that can represent special hazards:







An active power source is connected. This means that, regardless to the operating mode of the
inverter, there may be voltage present, either from the photovoltaic generator and/or the
FREESUN. This is especially important to consider when disconnecting particular parts of the
system.
Very high DC voltages are present (no zero-crossing) which, in case of a fault or inappropriate
use of fuses or plugs, may lead to arcing.
The short-circuit current of the photovoltaic generator is dependent on the level of solar
irradiation and only slightly more than the maximum operating current.
A highly branched generator array may be difficult to disconnect if a fault develops (e. g. short
circuit). We recommend the extra use of an external DC disconnect and fuses for disconnecting
the inverter to meet the requirements of NEC 690. These components are included in the
Power electronics optional disconnecting unit.
Fuses should be allocated to each DC input of the FREESUN inverter as it is required by NEC
690. Power Electronics covers this requirement with the Disconnecting Unit included in HEC-UL
and HEC-UL+ Series inverters. The Freesun HEC-UL+ integrates the Disconnecting Unit in the
same inverter’s cabinet and the Freesun HEC-UL integrates it in an annexed cabinet.
Power Electronics must be informed about the grid operator requirements.
The device contains capacitors on the AC and DC sides. The discharge time of the capacitors is
5 minutes. Wait until the capacitors have been discharged before carrying out any maintenance
task.
11
POWER ELECTRONICS
INTEGRATED ELECTRICAL SAFETY FEATURES
Freesun inverters have the following integrated electrical safety features:






Software protection controls (See section 3.3 and the Programming and Software manual).
On/Off switch (Reference 1 of the figure 0.1).
DC Disconnect Switch (Reference 3 of the figure 0.1).
AC Circuit breaker (Reference 2 of the figure 0.1).
Anti-islanding protection (See the Programming and Software Manual).
LED/Front panel display when unit is operational.
SYSTEM REPAIR AND TROUBLESHOOTING
CAUTION
Always follow established Lockout/Tagout procedures. Failure to comply can result in serious injury
or death to personnel.
LOCKOUT / TAGOUT
Lockout/tagout standards establish procedures to protect personnel from hazardous energy sources on
equipment during service and maintenance. OSHA 29 CFR, part 1910.333 gives flexibility for facility
operators to design a lockout/tagout program that suits site specific needs.
Lockout/tagout disables equipment producing hazardous amounts of electrical energy allowing servicing
and maintenance personnel to safely perform their jobs. Employees must be trained to understand and
follow the hazardous energy control procedures.


Use only lockout/tagout devices authorized for particular equipment.
Lockout/tagout devices must be durable, standardized and substantial.
Lockout/tagout tags must identify authorized users to ensure the procedures are strictly adhered to. In
order to reduce the chance of inadvertent system energization, the individual identified on the
lockout/tagout notices should be the only personnel in possession of keys that can be used to unlock the
lockout devices.
12
POWER ELECTRONICS
GROUND FAULT WARNING
If your installation has the positive or negative pole of the photovoltaic system earth
connected, the following instructions must be followed:
The only point in the installation where the positive or the negative pole should be
grounded is in the inverter (through the Ground Fault Detector Interrupter -GFDI- that
is added to that effect). It is important to note that if there was another grounded
connection (pole) elsewhere in the installation (in the panels themselves, in the String
Supervisor, etc...) the protection provided by the additional GFDI would NOT be
effective.
Therefore, as part of scheduled maintenance, it is recommended to inspect the insulation between
the grounded pole and the earth. This will prevent the GFDI from providing inappropriate protection
due to uncontrolled ground leakage.
MARKS, SYMBOLS AND CONTROLS ON THE INVERTER
CAUTION
Do not ignore safety warnings.
Failure to follow all safety warnings and caution could result in equipment damage or injury to personnel.
Inverter CAUTION labels are listed in the following table:
TEXT
LOCATION
Utility interactive
CAUTION - Risk of electric shock. Normally grounded conductors may be ungrounded and energized when a
ground-fault is indicated.
AC SWITCH
Rainproof
CAUTION – For Proper Circuit Connection. Connect a minimum ______ kVA rated isolating transformer between
the output of the unit and the utility powerline connections. The transformer is to be an isolation type having
separate primary and secondary windings.
CAUTION – Risk Of Electric Shock. Both AC and DC voltage sources are terminated inside this equipment. Each
circuit must be individually disconnected before servicing.
When the photovoltaic array is exposed to light, it supplies a DC voltage to this equipment.
Use Copper, Copper-Clad Aluminum or Aluminum conductor.
WARNING – To maintain safety certification, replace only with the same type and ratings of fuse.
CAUTION – Risk of electric shock from energy stored in capacitor. Stop the inverter feeding into the grid and wait 5
minutes before the AC supply disconnection. Do not remove the cover before the AC and DC disconnection.
Door.
Front part of each module.
AC module cabinet.
Door.
Rear part of the door.
Door.
Cable connections.
Close to the fuses.
Front part of each module.
The following symbols can be found in the inverter and used in this manual:
DC current
AC current
Grounding electrode terminal
Grounding point inside the inverter
On position
Off position
13
POWER ELECTRONICS
The following figure shows the location of the inverter control features:
Figure 0.1 Inverter controls
Note: For inverters with the AC module located in their left side, the previous image is inverted.


Inverter modules switch
(Inverter’s ON/OFF switch)
Main AC circuit breaker
It allows the connection and disconnection of
all the inverter modules.
the AC grid.
The following table represents an example of the name plate located on the inverter:
Model / Modèle:
FS1200CU10R0
DC INPUT / ENTRÉE DC
Max. Input DC Voltage / Tension d’entrée DC Max.:
1000V
Min. Voltage MPP / Tension MPP Min.:
585V
Max. Voltage MPP / Tension MPP Max.:
820V
Max. Input DC current / Courant d’entrée DC Max.:
2000A
AC OUTPUT / SORTIE AC
Nominal output voltage / Tension nominale de sortie:
390V
Frequency / Fréquence:
60Hz
Nominal Power / Puissance Nominale:
1200kW
Max. Output Current / Courant de Sortie Max.:
1776A
Ambient Temperature / Température Ambiante:
50ºC
NEMA 3R
MADE IN SPAIN
14

Disconnecting unit disconnects
(Internal in HEC-UL+ Series or external
in HEC-UL)
the DC grid. The inside components and
distribution must be configured by the user.
POWER ELECTRONICS
1 INTRODUCTION
The Freesun HEC-UL and HEC-UL+ Series inverters are the latest advance in solar inverter technology
2 2
2 2
based on Automatic Redundant Modular Master-Slave System (ARM S ). ARM S technology creates a
redundant solar inverter by automatically bypassing a faulted inverter module and restarting the inverter
2 2
making production losses a problem of the past. The Freesun Series ARM S Technology product line is
made of 80kVA to 150kVA individual module inverters with powerful dual microprocessors per module,
interconnected with a dedicated communication system for synchronization, and with both AC/DC
protections. These building blocks are used to design inverter systems from 160kVA to 1200kVA nominal
output power and with 1 to 4 MPPT windows.
FREESUN accessories fulfill all the solar installations requirements such as disconnecting unit, power
control interface (PCI), string monitoring (SFS), datalogger, remote inverter monitoring (FSDC),
meteorology stations and additional electric protections.
The Freesun HEC-UL and HEC-UL+ are the North American outdoor, UL-1741 approved versions of the
HE series. This system reduces the overall photovoltaic plant wiring and transportation costs.
The Power Electronics Disconnecting Unit is a cabinet that integrates DC input protection and dedicated
disconnects in the Freesun inverter. The Disconnecting Unit allows HEC-UL & HEC-UL+ inverters to
comply with NEC 2011 Article 690 Section III Disconnecting Means section 690.13.
For the compliance of the section 690.13 of the National Electric Code ANSI/NFPA 70 it is mandatory that
“Means shall be provided to disconnect all current-carrying dc conductors of a photovoltaic system from all
other conductors in a building or other structure”.
The Freesun HEC-UL+ integrates the Disconnecting Unit in the same inverter’s cabinet and the Freesun
HEC-UL can integrate it in an annexed cabinet.
STANDARD FEATURES
OPTIONS
Max. Efficiency PAC, nom (η) 98.6%.
Multiple and user friendly monitoring solutions.
AC and DC contactors in each module, and AC circuit breaker.
Grid operator control by the Power Control Interface.
High accuracy MPPT over a wide voltage range.
Integrated Meteo Stations and video camera.
Engineered for compliance with international grid connection codes.
(IEEE1547, BDEW, CEI 0-16, PO12.3, …)
Uninterruptible Power Supply (UPS).
Automatic Redundant Modular Master-Slave System (ARM2S2).
Disconnecting Unit monitoring system.
Efficient cooling system with variable speed drive control.
Alphanumeric Display.
Internal DC fuse protections.
Figure 1.1 General view of the frame 3 FREESUN HEC-UL+ Series inverter
CONFIGURATION TABLE & STANDARD RATINGS
15
POWER ELECTRONICS
2 CONFIGURATION TABLE & STANDARD
RATINGS
2.1 Configuration Table
The Freesun inverter series has 4 different frame sizes with up to 2 modules per frame. HEC-UL and
HEC-UL+ series inverters are specified using the following configuration table:
EXAMPLE.
CODE: FS 0880 C U 10 A V 2 N A 1
0160
0250
...
1250
C
P
K
U
06
10
A
N
P
HEC-UL & HEC-UL+ SERIES
FREESUN SERIES
160kVA
250 kVA
...
1250kVA
Outdoor NEMA 3R (HEC-UL SERIES)
Outdoor with input protection and disconnection cabinet NEMA 3 (HEC-UL+ SERIES)
Power Skid w/ HEC-UL
UL High Efficiency Inverter
600VDC
1000VDC
Ungrounded system, Isolation monitoring between (+), (-) and earth
Grounded PV array Negative pole (with GFDI)
Grounded PV array Positive pole (with GFDI)
V
With AC and DC overvoltage protection
R
With AC and DC overvoltage protection and lightning protection
FS
0880
Output Power
C
Inverter Location
U
Inverter Topology
Maximum input
voltage
10
A
Isolating
monitoring
V
Lightning and
overvoltage
protections
0
2
Maximum power
point tracker range
(MPPt)
1
2
6
N
Auxiliary supply
A
Humidity Control
1
MPPT
Configuration
-
Other
...
N
N
R
A
1
2
3
4
I
…
From 585-820V
Transformer connection to 390 VAC
From 540-820V
From 500-820V
From 330-600V
Under request [1]
Not included
Not included
With heating
Active Heating
1MPPT
2MPPT
3MPPT
4MPPT
Left side – AC module
Under request [1]
[1] For other configuration consult with Power Electronics.
16
POWER ELECTRONICS
The Disconnecting Unit is specified using the following configuration table:
EXAMPLE.
FSDU
Product
Family
CODE: FSDU 1 25 5 08 F 1 I
1
25
1
1 Disc.
25
250A
5
# Fuses per
Disconnect
and Pole [2]
1
1 Fuse
07
70A
F
2
2 Disc.
40
400A
2
2 Fuses
08
80A
P
3
3 Disc.
70
700A
3
3 Fuses
09
90A
N
4
4 Disc.
12
1250A
4
5
6
7
8
9
0
4 Fuses
5 Fuses
6 Fuses
7 Fuses
8 Fuses
9 Fuses
10 Fuses
10
12
16
20
25
30
35
40
100A
125A
160A
200A
250A
300A
350A
400A
# DC
Disconnect
Disconnects [1]
Size
08
F
-
1
I
Fuse
Rating
String
Configuration
String Monitoring
#MPPT [3]
Type [4]
-
1
1 MPPt
E
External
2
2 MPPt
I
Internal
3
3 MPPt
4
4 MPPt
Floating Array
Positive Pole
grounded
Negative Pole
grounded
M
No Monitoring
String current
Monitoring
[1] Maximum 3 units for 1250A disconnects.
[2] Maximum 5 fuses per pole for floating array PV plant configurations.
[3] Consult availability. In grounded PV installations the inverter can only be configured with one MPPt.
[4] External in HEC-UL or internal in HEC-UL+.
2.2 Standard Ratings
The following table summarizes the available Freesun inverters based on frame size.
FRAME
0
1
REFERENCE
Max. PV Power
(PPV)
FS0160฀U฀฀฀6฀฀
FS0250฀U฀฀฀2฀฀
FS0280฀U฀฀฀1฀฀
FS0300฀U฀฀฀0฀฀
FS0240฀U฀฀฀6฀฀
FS0380฀U฀฀฀2฀฀
FS0420฀U฀฀฀1฀฀
FS0450฀U฀฀฀0฀฀
FS0320฀U฀฀฀6฀฀
FS0500฀U฀฀฀2฀฀
FS0560฀U฀฀฀1฀฀
FS0600฀U฀฀฀0฀฀
FS0400฀U฀฀฀6฀฀
192kWp
300kWp
334kWp
360kWp
INPUT
DC Voltage
Range MPPt
(VDC) [2]
330V-600V
500V-820V
540V-820V
585V-820V
288kWp
450kWp
500kWp
540kWp
384kWp
600kWp
667kWp
720kWp
480kWp
750kWp
FS0630฀U฀฀฀2฀฀
FS0700฀U฀฀฀1฀฀
2
FS0751฀U฀฀฀0฀฀
FS0480฀U฀฀฀6฀฀
FS0750฀U฀฀฀2฀฀
FS0830฀U฀฀฀1฀฀
FS0900฀U฀฀฀0฀฀
3
FS0560฀U฀฀฀6฀฀
FS0880฀U฀฀฀2฀฀
FS0970฀U฀฀฀1฀฀
FS1050฀U฀฀฀0฀฀
FS0640฀U฀฀฀6฀฀
FS1000฀U฀฀฀2฀฀
FS1110฀U฀฀฀1฀฀
FS1200฀U฀฀฀0฀฀
FS1250฀U฀฀฀0฀฀
500A
500A
500A
500A
Nominal AC
Output Power
(PAC) [1]
160kVA
250kVA
280kVA
300kVA
OUTPUT
Operating
Grid Voltage
±10% (VAC)
208V
330V
360V
390V
Nominal AC
Current
(IAC, nom)
444A
438A
444A
444A
330V-600V
500V-820V
540V-820V
585V-820V
330V-600V
500V-820V
540V-820V
585V-820V
330V-600V
500V-820V
750A
750A
750A
750A
1000A
1000A
1000A
1000A
1250A
1250A
240kVA
380kVA
420kVA
450kVA
320kVA
500kVA
560kVA
600kVA
400kVA
630kVA
208V
330V
360V
390V
208V
330V
360V
390V
208V
330V
666A
656A
667A
666A
888A
875A
889A
888A
1250A
1230A
834kWp
900kWp
540V-820V
585V-820V
1250A
1250A
700kVA
750kVA
360V
390V
1111A
1110A
576kWp
900kWp
330V-600V
500V-820V
1500A
1500A
480kVA
750kVA
208V
330V
1332A
1313A
1001kWp
1080kWp
672kWp
1050kWp
1168kWp
1260kWp
768kWp
1200kWp
1334kWp
1440kWp
1500kWp
540V-820V
585V-820V
330V-600V
500V-820V
540V-820V
585V-820V
330V-600V
500V-820V
540V-820V
585V-820V
585V-820V
1500A
1500A
1750A
1750A
1750A
1750A
2000A
2000A
2000A
2000A
2000A
830kVA
900kVA
565kVA
880kVA
970kVA
1050kVA
640kVA
1000kVA
1110kVA
1200kVA
1250kVA
360V
390V
208V
330V
360V
390V
208V
330V
360V
390V
390V
1333A
1332A
1554A
1532A
1555A
1554A
1776A
1750A
1778A
1776A
1850A
Max. DC
current (A)
17
POWER ELECTRONICS
Freesun Rated Available Power based on AC Output Voltage and Number of Power Modules:
MPPt Range (VDC) [2]
330V-600V
500V-820V
540V-820V
585V-820V
2
160
250
280
300
3
240
380
420
450
4
320
500
560
600
5
400
630
700
750
6
480
750
830
900
7
560
880
970
1050
8
640
1000
1110
1200 / 1250
AC Output
Voltage
208Vac
330Vac
360Vac
390Vac
[1] Values at 50ºC.
[2] Values at 1.00·Vac nom and cos Φ= 1.
18
AC Output Power (kVA) [1]
Nº Modules
POWER ELECTRONICS
3 TECHNICAL CHARACTERISTICS
3.1 Environmental Specifications
ENVIRONMENT
The following table summarizes the environmental specifications for the Freesun HEC-UL and HEC-UL+
inverter series.
Degree of protection
Permissible Ambient Temperature [1]
Relative Humidity
Max. Altitude (above sea level) [1]
Noise level [2]
Pollution degree
Painting
NEMA 3R
-4ºF to +122ºF (-20ºC to +50ºC)
4% to 100%
1000m; >1000m power derating 1% Sn (kVA) per 100m
< 70 dBA
PD3
RAL 7035
[1] Other characteristics consult with Power Electronics.
[2] Sound pressure level at a distance of 1m from the rear part.
3.2 Control Interface Specifications
CONTROL
INTERFACE
The following table summarizes the control and communication specifications for the Freesun HEC-UL
and HEC-UL+ inverter series.
Interface
Communication
Analogue Inputs
Digital Outputs
Alphanumeric display
RS232 / RS485 / USB / Ethernet, (Modbus RTU Protocol, Modbus TCP/IP)
1 programmable and differential inputs; (0-20mA or ± 10mV to ± 10V) and PT100
2 electrically-isolated programmable switched relays (250VAC, 8A or 30 VDC, 8A)
3.3 Undervoltage, Overvoltage and Frequency Ride Through
Characteristics
PROTEC
TIONS
The following table summarizes the voltage and frequency ride through capabilities of the Freesun HECUL and HEC-UL+ inverter series.
SW Low Voltage
SW High Voltage
SW Low Frequency
SW High Frequency
Fast: 50%·Vn (0.1s) and Slow: 88%·Vn (2s)
Fast: 120%·Vn (0.1s) and Slow: 110%·Vn (1s)
Fast: 57.00Hz (0.1s) and Slow: 58.00Hz (20s)
Fast: 60.50Hz (0.1s)
Note: The values shown in the previous table are set as standard in the inverter and are in accordance
with the regulation IEEE 1547. Modifying these values could result in IEEE1547 regulation noncompliance. This cannot happen without the utility and local authorities consent.
TECHNICAL CHARACTERISTICS
19
POWER ELECTRONICS
3.4 Freesun 390Vac, 1000Vdc, 300kVA to 1250kVA
390VAC - MPPt range 585Vdc-820Vdc
3
4
5
6
7
FREESUN HE
0300_U
0450_U
0600_U
0751_U
0900_U
1050_U
300
330
444
450
495
666
600
660
888
OUTPUT
Frame 0
2
Nominal AC Output Power(kVA)
Rated Output Power (+10%) (kVA) [2]
Nominal Output AC Current (A)
Operating Grid Voltage(VAC)
Operating Range, Grid Frequency
Voltage Ripple, PV Voltage
Current Harmonic Distortion (THDi)
Power Factor (cosine phi)
Power Curtailment (kVA)
INPUT
Number of Modules
DC Voltage Range MPPT (VDC) [3]
Max. permissible DC voltage
Max. continuous DC current (A)
Max. short circuit DC current (A)
[1]
EFFICIENCY &
AUX. SUPPLY
Max. Efficiency PAC, nom (η)
Weighted CEC Efficiency (η)
Max. Standby Consumption (Pnight)
CABINET
HEC-UL+
Dimensions
[WxDxH] [4]
mm
HEC-UL
Dimensions
[WxDxH] [4]
mm
inches
inches
HEC-UL with external
mm
Disconnecting Unit
Dimensions
inches
[WxDxH] [4]
[4]
HEC-UL+ Weight (kg/lbs)
HEC-UL Weight (kg/lbs) [4]
HEC-UL with DU Weight (kg/lbs) [4]
Air Flow
Type of ventilation
1000A
1300A
98.6%
98.0%
98.6%
98.0%
98.6%
98.0%
920W
PROTECTIONS
8
1200_U
1250_U
585V-820V
1000V
1250A
1500A
1625A
1950A
1750A
2275A
98.6%
98.6%
98.6%
98.6%
98.0%
98.0%
98.0%
98.0%
< approx. 40W per module
Built-in internal transformer as standard
(Optional external 3x208Vac power supply and UPS backup system)
1380W
1840W
2300W
2760W
3220W
3680W
1250
1350
1850
2000A
2600A
98.6%
98.0%
3680W
2900 x 1020 x
3900 x 1020 x 2400
4900 x 1020 x 2400
5900 x 1020 x 2400
2400
11411/64 x
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
2329/32 x 405/32 x 9431/64
405/32 x 9431/64
1900 x 1020 x
2900 x 1020 x 2400
3900 x 1020 x 2400
4900 x 1020 x 2400
2400
51/64
5/32
74 x 40
11411/64 x 405/32 x 9431/64
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
x 9431/64
3200 x 1020 x
4200 x 1020 x 2400
5200 x 1020 x 2400
6200 x 1020 x 2400
2400
5/32
126 x 40 x
16523/64 x 405/32 x 9431/64
20423/32 x 405/32 x 9431/64
2443/32 x 405/32 x 9431/64
9431/64
2470/3450
3220/7100
3530/7780
4290/9460 4600/10140 5340/11770
5650/12460
1720/3800
2470/3450
2780/6130
3540/7800
3850/8500 4590/10120
4900/10800
2490/5490
3240/7140
3550/7830 5310/11710 4620/10190 5360/11820
5670/12500
Intake through rear lower part blown out through upper side
Forced
Heating Resistors
Emergency Stop
General AC Circuit Breaker
AC Contactor
AC Circuit Breaker
DC Contactor
DC Fuses
General DC Protection
Overvoltage Protection
Protection class
Lightning Protections
Safety
Utility Interconnect
Grid support (optional)
Floating PV array: Isolation Monitoring per MPP
Grounded PV array (Positive pole and negative pole): GFDI protection
Standard
Optional
Standard; External Operation
standard in each module
Optional External Disconnecting Unit Cabinet
(DC fuse protection and no load disconnect with external operating handle)
DC and AC Inverter sides (Type 4) and Auxiliary Supply type 2- Internal Standard
Class I
Optional (Integrated in the inverter)
UL 1741; CSA 22.2 No.107.1-01
IEEE 1547
LVRT, Active & Reactive Power Control, etc. [5]
[2] Maximum ambient temperature 40ºC.
[4] These values can be changed depending on the order. Consult Power Electronics for more details.
[5] Consult Power Electronics for the full list of grid support capabilities.
20
Frame 3
750
900
1050
1200
825
990
1155
1320
1110
1332
1554
1776
390Vac (± 10%)
60Hz
< 3%
< 3% at nominal power
0.0 leading … 0.0 lagging / 0.90 leading … 0.90 lagging (adjustable)
0...110%/0.1% Steps
750A
975A
Ground Fault Protection
REGULATIONS
Frame 2
500A
650A
Control Power Supply
Avg. Power Consumption
Frame 1
POWER ELECTRONICS
3
4
5
6
7
8
FREESUN HE
0280_U
0420_U
0560_U
0701_U
0830_U
0970_U
1110_U
280
310
444
420
460
667
560
610
889
Nominal AC Output Power(kVA) [1]
DC Voltage Range MPPT (VDC)[3]
CABINET
EFFICIENCY &
AUX. SUPPLY
OUTPUT
Frame 0
2
INPUT
Number of Modules
PROTECTIONS
98.6%
98.0%
920W
HEC-UL+
Dimensions
[WxDxH] [4]
mm
HEC-UL
Dimensions
[WxDxH] [4]
mm
inches
inches
mm
Disconnecting Unit
Dimensions
inches
[WxDxH] [4]
[4]
Air Flow
Type of ventilation
Heating Resistors
Emergency Stop
AC Contactor
AC Circuit Breaker
DC Contactor
DC Fuses
Protection class
REGULATIONS
500A
650A
Safety
2900 x 1020 x
2400
11411/64 x 405/32
x 9431/64
1900 x 1020 x
2400
7451/64 x 405/32 x
9431/64
3200 x 1020 x
2400
126 x 405/32 x
9431/64
2470/3450
1720/3800
2490/5490
Frame 1
Frame 2
Frame 3
700
830
970
760
920
1070
1111
1333
1555
360Vac (± 10%)
60Hz
< 3%
0...110%/0.1% Steps
750A
975A
1000A
1300A
540V-820V
1000V
1250A
1625A
1500A
1950A
1750A
2275A
1110
1220
1778
2000A
2600A
98.6%
98.0%
98.6%
98.6%
98.0%
98.0%
1380W
1840W
2300W
2760W
3220W
3680W
3900 x 1020 x 2400
4900 x 1020 x 2400
5900 x 1020 x 2400
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
2329/32 x 405/32 x 9431/64
2900 x 1020 x 2400
3900 x 1020 x 2400
4900 x 1020 x 2400
11411/64 x 405/32 x 9431/64
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
4200 x 1020 x 2400
5200 x 1020 x 2400
6200 x 1020 x 2400
16523/64 x 405/32 x 9431/64
20423/32 x 405/32 x 9431/64
2443/32 x 405/32 x 9431/64
3220/7100
3530/7780
4290/9460
4600/10140
5340/11770
2470/3450
2780/6130
3540/7800
3850/8500
4590/10120
3240/7140
3550/7830
5310/11710
4620/10190
5360/11820
Forced
5650/12460
4900/10800
5670/12500
Standard
Optional
Class I
UL 1741; CSA 22.2 No.107.1-01
IEEE 1547
21
POWER ELECTRONICS
3
4
5
6
7
8
FREESUN HE
0250_U
0380_U
0501_U
0630_U
0750_U
0880_U
1001_U
250
280
438
380
410
656
500
550
875
OUTPUT
Frame 0
2
INPUT
Number of Modules
EFFICIENCY &
AUX. SUPPLY
500A
650A
98.6%
98.0%
920W
CABINET
HEC-UL+
Dimensions
[WxDxH] [4]
mm
HEC-UL
Dimensions
[WxDxH] [4]
mm
inches
inches
mm
Disconnecting Unit
Dimensions
inches
[WxDxH] [4]
HEC-UL+ Weight (kg/lbs) [4]
Air Flow
Type of ventilation
2900 x 1020 x
2400
11411/64 x 405/32
x 9431/64
1900 x 1020 x
2400
7451/64 x 405/32 x
9431/64
3200 x 1020 x
2400
126 x 405/32 x
9431/64
2470/3450
1720/3800
2490/5490
PROTECTIONS
Heating Resistors
Emergency Stop
AC Contactor
AC Circuit Breaker
DC Contactor
DC Fuses
Protection class
REGULATIONS
Safety
Frame 1
Frame 2
630
750
880
690
830
960
1230
1313
1532
330Vac (± 10%)
60Hz
< 3%
0...110%/0.1% Steps
750A
975A
1000A
1300A
500V-820V
1000V
1250A
1625A
1500A
1950A
1750A
2275A
1000
1100
1750
2000A
2600A
98.6%
98.0%
98.6%
98.6%
98.0%
98.0%
1380W
1840W
2300W
2760W
3220W
3680W
3900 x 1020 x 2400
4900 x 1020 x 2400
5900 x 1020 x 2400
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
2329/32 x 405/32 x 9431/64
2900 x 1020 x 2400
3900 x 1020 x 2400
4900 x 1020 x 2400
11411/64 x 405/32 x 9431/64
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
4200 x 1020 x 2400
5200 x 1020 x 2400
6200 x 1020 x 2400
16523/64 x 405/32 x 9431/64
20423/32 x 405/32 x 9431/64
2443/32 x 405/32 x 9431/64
3220/7100
3530/7780
4290/9460
4600/10140
5340/11770
2470/3450
2780/6130
3540/7800
3850/8500
4590/10120
3240/7140
3550/7830
5310/11710
4620/10190
5360/11820
Forced
Standard
Optional
Standard; External Operating Handle
Class I
UL 1741; CSA 22.2 No.107.1-01
IEEE 1547
22
Frame 3
5650/12460
4900/10800
5670/12500
POWER ELECTRONICS
3
4
5
6
7
8
FREESUN HE
0160_U
0240_U
0320_U
0400_U
0480_U
0560_U
0640_U
160
176
444
240
264
666
320
352
888
CABINET
EFFICIENCY &
AUX. SUPPLY
OUTPUT
Frame 0
2
INPUT
Number of Modules
PROTECTIONS
98.6%
98.0%
920W
HEC-UL+
Dimensions
[WxDxH] [4]
mm
HEC-UL
Dimensions
[WxDxH] [4]
mm
inches
inches
mm
Disconnecting Unit
Dimensions
inches
[WxDxH] [4]
[4]
Air Flow
Type of ventilation
Heating Resistors
Emergency Stop
AC Contactor
AC Circuit Breaker
DC Contactor
DC Fuses
Protection class
REGULATIONS
500A
650A
Safety
2900 x 1020 x
2400
11411/64 x 405/32
x 9431/64
1900 x 1020 x
2400
7451/64 x 405/32 x
9431/64
3200 x 1020 x
2400
126 x 405/32 x
9431/64
2470/3450
1720/3800
2490/5490
Frame 1
Frame 2
Frame 3
400
480
560
440
528
616
1250
1332
1554
208VAC (± 10%)
60Hz
< 3%
0...110%/0.1% Steps
750A
975A
1000A
1300A
330V-600V
600V
1250A
1625A
1500A
1950A
1750A
2275A
640
704
1776
2000A
2600A
98.6%
98.0%
98.6%
98.6%
98.0%
98.0%
1380W
1840W
2300W
2760W
3220W
3680W
3900 x 1020 x 2400
4900 x 1020 x 2400
5900 x 1020 x 2400
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
2329/32 x 405/32 x 9431/64
2900 x 1020 x 2400
3900 x 1020 x 2400
4900 x 1020 x 2400
11411/64 x 405/32 x 9431/64
15335/64 x 405/32 x 9431/64
19229/32 x 405/32 x 9431/64
4200 x 1020 x 2400
5200 x 1020 x 2400
6200 x 1020 x 2400
16523/64 x 405/32 x 9431/64
20423/32 x 405/32 x 9431/64
2443/32 x 405/32 x 9431/64
3220/7100
3530/7780
4290/9460
4600/10140
5340/11770
2470/3450
2780/6130
3540/7800
3850/8500
4590/10120
3240/7140
3550/7830
5310/11710
4620/10190
5360/11820
Forced
5650/12460
4900/10800
5670/12500
Standard
Optional
Class I
UL 1741; CSA 22.2 No.107.1-01
IEEE 1547
23
3.8 Operational Diagram
Figure 3.1 Operational Diagram HEC-UL & HEC-UL+ Series
24
POWER ELECTRONICS
POWER ELECTRONICS
4 DIMENSIONS AND WEIGHTS
The inverter is a heavy cabinet unit. Select the transport method adequately. Follow the
transport recommendations of this manual and ensure the compliance with the safety regional
regulations.
Danger of tipping during transport. The cabinet must always be transported upright.
4.1 HEC-UL+ Series
The HEC-UL+ series has the input cabinet integrated in the left side of the inverter. The dimensions and
weight are defined in the following table:
INVERTER
FRAMES
0
1
2
3
REFERENCE
FS0160PU฀฀฀6฀฀, FS0250PU฀฀฀2฀฀,
FS0280PU฀฀฀1฀฀, FS0300PU฀฀฀0฀฀
FS0400PU฀฀฀6฀฀, FS0630PU฀฀฀2฀฀,
FS0700PU฀฀฀1฀฀, FS0751PU฀฀฀0฀฀
FS0480PU฀฀฀6฀฀, FS0750PU฀฀฀2฀฀,
FS0830PU฀฀฀1฀฀, FS0900PU฀฀฀0฀฀
FS0400PU฀฀฀6฀฀, FS0630PU฀฀฀2฀฀,
FS0700PU฀฀฀1฀฀, FS0751PU฀฀฀0฀฀
FS0480PU฀฀฀6฀฀, FS0750PU฀฀฀2฀฀,
FS0830PU฀฀฀1฀฀, FS0900PU฀฀฀0฀฀
FS0560PU฀฀฀6฀฀, FS0880PU฀฀฀2฀฀,
FS0970PU฀฀฀1฀฀, FS1050PU฀฀฀0฀฀
FS0640PU฀฀฀6฀฀, FS1000PU฀฀฀2฀฀,
FS1110PU฀฀฀1฀฀, FS1200PU฀฀฀0฀฀
DIMENSIONS in mm / in
WIDTH
DEPTH
HEIGHT
(W)
(D)
(H)
2900/11411/64
1020/405/32
2400/9431/64
3900/15335/64
1020/405/32
2400/9431/64
WEIGHT
(kg/lbs)
2470/3450
3220/7100
3530/7780
4290/9460
4900/19229/32
1020/405/32
2400/9431/64
4600/10140
5340/11770
5900/2329/32
1020/405/32
2400/9431/64
5650/12460
Figure 4.1 HEC-UL+ Frame 3
Note: For inverters with the AC module located on the left side, the previous image is inverted.
DIMENSIONS AND WEIGHTS
25
POWER ELECTRONICS
4.2 HEC-UL Series
The HEC-UL series don’t integrate an input cabinet. The dimensions and weight are defined in the
following table:
INVERTER
FRAMES
0
1
2
3
WIDTH
DEPTH
HEIGHT
(W)
(D)
(H)
REFERENCE
FS0160CU฀฀฀6฀฀, FS0250CU฀฀฀2฀฀,
FS0280CU฀฀฀1฀฀, FS0300CU฀฀฀0฀฀
FS0240CU฀฀฀6฀฀, FS0380CU฀฀฀2฀฀,
FS0420CU฀฀฀1฀฀, FS0450CU฀฀฀0฀฀
FS0320CU฀฀฀6฀฀, FS0500CU฀฀฀2฀฀,
FS0560CU฀฀฀1฀฀, FS0600CU฀฀฀0฀฀
FS0400CU฀฀฀6฀฀, FS0630CU฀฀฀2฀฀,
FS0700CU฀฀฀1฀฀, FS0751CU฀฀฀0฀฀
FS0480CU฀฀฀6฀฀, FS0750CU฀฀฀2฀฀,
FS0830CU฀฀฀1฀฀, FS0900CU฀฀฀0฀฀
FS0560CU฀฀฀6฀฀, FS0880CU฀฀฀2฀฀,
FS0970CU฀฀฀1฀฀, FS1050CU฀฀฀0฀฀
FS0640CU฀฀฀6฀฀, FS1000CU฀฀฀2฀฀,
FS1110CU฀฀฀1฀฀, FS1200CU฀฀฀0฀฀
1900/7451/64
1020/405/32
2400/9431/64
2900/11411/64
1020/405/32
2400/9431/64
WEIGHT
(kg/lbs)
1720/3800
2470/3450
2780/6130
3540/7800
3900/15335/64
1020/405/32
2400/9431/64
3850/8500
4590/10120
4900/19229/32
1020/405/32
2400/9431/64
4900/10800
Figure 4.2 HEC-UL Frame 3
26
POWER ELECTRONICS
4.3 HEC-UL Series with External Disconnecting Unit
The HEC-UL Series has a separate cabinet for the input cabinet. The dimensions and weight are defined
in the following table:
INVERTER
FRAMES
0
1
2
3
REFERENCE
WIDTH
DEPTH
HEIGHT
(D)
(H)
W1
W2
FS0160CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0250CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
3200/126
FS0280CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0300CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
FS0240CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0380CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0420CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0450CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
4200/16523/64
FS0320CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0500CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0560CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0600CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
FS0400CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0630CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0700CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0751CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
5200/20423/32
FS0480CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0750CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0830CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0900CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
FS0560CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0880CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS0970CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS1050CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
6200/2443/32
FS0640CU฀฀฀6฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS1000CU฀฀฀2฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS1110CU฀฀฀1฀฀+FSDU฀฀฀฀฀฀฀฀E,
FS1200CU฀฀฀0฀฀+FSDU฀฀฀฀฀฀฀฀E
1135/4411/16
1020/405/32
2400/9431/64
WEIGHT
(kg/lbs)
2490/5490
3240/7140
1135/4411/16
1020/405/32
2400/9431/64
3550/7830
5310/11710
1135/4411/16
1020/405/32
2400/9431/64
4620/10190
5360/11820
1135/4411/16
1020/405/32
2400/9431/64
5670/12500
Figure 4.3 HEC-UL Frame 3 with external Disconnecting Unit
27
POWER ELECTRONICS
5 HANDLING, TRANSPORTATION AND
INSTALLATION
CAUTION
Carefully read the following transportation and installation instructions.
Failure to follow transportation and installation instructions could result in equipment damage or injury to
personnel.
5.1 Delivery and Storage
The Freesun Inverters are carefully tested and packed for shipment. In the event of transport damage,
please ensure that you notify the transport agency and Power Electronics (International +34 96 136 65
57) or your nearest agent, within 24hrs from receipt of the goods.
Make sure model and serial number of the Inverter are the same on the delivery note and unit.
The inverter should be stored in a location that is protected from direct sun and excess moist. The
storage temperature rating for the inverter is -25°C and +55°C.
5.2 Handling and Transportation
Only the transport methods described in this document or in the delivery notes are approved. Follow the
transport requirements here described. Any other transport method or system could damage the unit.
The inverter and the Disconnecting Unit cabinets are designed to be lifted with a crane. Power
Electronics provides eight lifting eye bolts for the inverter. Furthermore, in the event of having an HEC-UL
inverter, Power Electronics provides four lifting eye bolts for the Disconnecting unit. These lifting eye
bolts must be installed in the top part of the inverter as shown in the next figures. Make sure the lifting
capacity of all the equipment is greater than the cabinets’ weight.
A crane is required for the onsite unloading of the inverter. It is the customer’s responsibility to ensure
unimpeded access to the final place or location, taking into account the movement and handling of these
vehicles in the field where the unloading is going to take place.
Additionally the crane must meet the following requirements.



The crane must be independent from the truck.
The crane must be equipped with an eight-point chain or two four-point chains (one four-point chain
for the Disconnecting Unit).
The crane and the transport items must have a greater load capacity than the inverter weight.
Customer must provide an 8 points or two 4 points lifting chains and rig the inverter as it is shown in the
next figure (one four-point chain for the Disconnecting Unit).
28
HANDLING, TRANSPORTATION AND INSTALLATION
POWER ELECTRONICS
The following scheme illustrates the transport recommendations of the inverter cabinet.
Figure 5.1 Inverter crane transport recommendations [mm/in]
The inverter’s center of gravity is located as the following coordinates from the left bottom side:
INVERTER
HEC-UL Frame 3
Ix (mm/in)
2495 / 9815/64
Iy (mm/in)
1286 / 505/8
Iz (mm/in)
435 / 171/8
29
POWER ELECTRONICS
The following scheme illustrates the transport recommendations of the Disconnecting Unit cabinet for
HEC-UL inverters.
Figure 5.2 Disconnecting Unit crane transport recommendations
The Disconnecting Unit center of gravity is located as the following coordinates from the left bottom side:
Ix (mm/in)
566 / 229/32
30
Iy (mm/in)
1266 / 4927/32
Iz (mm/in)
423 / 1621/32
POWER ELECTRONICS
During transportation it is mandatory to manipulate it carefully and as close to the floor as possible.
CAUTION
If the maximum tonnage of cranes cannot meet the requirement (refer to section 4), it could cause
damage to the equipment and lead to injury to people.
Avoid brusque movements and shocks during lifting. Pause before lowering it to the floor and
then slowly lower it on the floor to avoid any shock. Otherwise, the equipment can be damaged.
Once the inverter is placed on the foundations, the installer must secure the inverter to the concrete
using a M14 (7/16) hot dip galvanized bolts of at least 10.9 quality, applying a torque of 73.75lb/ft
(100Nm). There is an L shape in each point of support that fixes the inverter to the floor. User must use a
bolt per point of support.
Figure 5.3 Floor fixation [mm/in]
5.3 Installation requirements
The inverter has been designed with an isolated cabinet that ensures the optimum outdoor performance
under the ambient conditions specified. Nevertheless it is recommended for locations with an ambient
2
temperature higher than 40ºC and an incident radiation higher than 1100 W/m to orient the inverter front
part facing north and use a canopy to keep direct sun off the unit.
For an adequate inspection and cooling capacity the following minimum distance should be considered.
Figure 5.4 Inverter clearances [mm/in]
The inverter needs no side clearance but it is necessary to leave a walkway in the rear part of it.
31
POWER ELECTRONICS
5.4 Suggested Foundations
The foundation must guarantee a solid, plain and leveled surface to the inverter, a minimum working
space around it and a smoothly AC and DC cable access. The foundations should provide at least the
following specifications.

The foundation and soil should stand at least the inverter weight.

The concrete surface should be honed to ensure a correct positioning of the inverter.

The surface should avoid water pools and favor rain water evacuation with a slope below 1%.

The foundations must guarantee enough space for maintenance equipment and personnel.

The foundations must have a 150mm step.
LETTER
Distance
INVERTER
HEC-UL+
HEC-UL
mm
in
B
2900
11411/64
C
500
1911/16
FRAME
A - DIMENSIONS (mm/in)
3
2
1
0
3
2
1
0
6900 / 27121/32
5900 / 2329/32
4900 / 19229/32
3900 / 15335/64
7200 / 28315/32
6200 / 2443/32
5200 / 20423/32
4200 / 16523/64
D
1100
435/16
E
1400
551/8
F
1000
393/8
G
1300
513/16
FOOTINGS
Nº
DIMENSIONS
LOAD (kg)
1&7
2 to 6
890 x 150
890 x 120
850
850
Figure 4.6 HEC-UL foundations [mm]
The cables must be routed smoothly into the inverter from below, where the DC and AC busbars are
allocated. The input and output dimensions are described in point “6. Wiring access and connections”.
To ensure neither animals, insects, dust nor moisture could enter through the canalization, it is
recommended to fill the canalization with polyurethane foam.
32
POWER ELECTRONICS
5.5 Disconnecting Unit Assembly for HEC-UL Inverters
The Disconnecting Unit cabinet of the HEC-UL inverter is delivered separately. The DC power
connections between the DC disconnecting unit and the inverter cabinet must be done during installation.
The following table indicates the number of components that are contained in the union:
Component
Mating flanges for busbar transits (HxWxD
mm/in)=(240/929/64 x 730/2847/64 x 200/77/8)
Positive connection busbar
Negative connection busbar
M8 (1/4) screws
M8 (1/4) bolts
M8 (1/4) spring washers
M8 (1/4) fender washers
M6 (12) screws
M6 (12) Neoprene washers
Units
Piece of the figure 5.4
1
1
1
1
16
16
16
32
22
22
2
3
The following figure identifies all the pieces described in the previous table:
Figure 5.5 Assembly kit
Follow the steps in this section to connect the Disconnecting Unit to the
inverter cabinet.




Unscrew the 10 M6 (12) screws and neoprene washers of the
cabinets’ removable panels in the union sides; keep the screws and
the fender washers in a safe place for future use.
Apply a conductive paste in the union of the connection busbars.
Use the M8 (1/4) screws, bolts, spring washers and fender washers
to fix the busbars (piece 2 of the figure 5.4) in one of the two
cabinets that will be joined.
Use the removed M6 (12) screws and neoprene washers to fix the
mating flange (piece 1 of the figure 5.4).
The following figure shows the result of the previous steps.
Figure 5.6 Cabinet assembly kit connections
33
POWER ELECTRONICS
Next, join the cabinets and screw the M8 screws, bolts, spring washers and fender washers to fix the
connection busbars in the other cabinet. The following figure illustrates this action:
Figure 5.7 Connection busbars fixation
Finally, fix the mating flange to the other cabinet using the remaining M6 (12) screws. The following figure
illustrates this action:
Figure 5.8 Mating flange connection
5.6 Cooling System
The inverter has an independent IGBT variable speed cooling system1. The air enters through the inlet
hood located in the bottom part and exits through the outlet hood placed at the top part of the inverter
thanks to the cabinets’ fans.
Figure 5.9 Cooling system
1
34
Check software and programming manual to configure the cooling system.
POWER ELECTRONICS
Each internal module of the inverter requires 1400m³/h of fresh air. For example, an inverter with 4
modules requires 5600m³/h). Check the technical characteristics of the selected inverter to determine the
number of modules.
If the inverter is installed in a metal or concrete cabinet, ensure that the enclosure is equipped with
adequate exhaust air vents and inlet dampers. The HVA system must be designed to ensure the ambient
ratings of the inverters with sufficient capacity to dissipate the internal heat generated.
The inverter module electronics and the AC module are cooled through a cooling system installed in each
electronics compartment that moves the fresh and clean air from the bottom, through the dust filters and
fans, to the top dust filters and exhaust fans. Each fan presents a cooling capacity of 75m³/h.
The dust filters located in the inlet and outlet grating of the cabinet must be cleaned or replaced as part of
the regularly scheduled maintenance. The inverter can integrate two types of grating. The frequency of
maintenance should be according to the environmental site conditions.
To replace the type 1 inlet and outlet filters, follow the next steps:




Pull from the top right corner to unclip the grating.
Remove and clean/replace the filter.
Place again the filter.
Clip again the grating pressing smoothly.
Figure 5.10 Filter clean/replacement
To replace the type 2 inlet and outlet filters, follow the next steps:






Unscrew the three bolts that fix the grating to the electronics module.
Unscrew the two bolts that fix both parts of the grating.
Remove and clean/replace the filter.
Place again the filter.
Screw again the grating parts.
Screw again the grating to the electronics module.
Figure 5.11 Filter clean/replacement
Maintain clearance distances around the inverter to ensure adequate cooling capacity for the inverter.
Install the inverter in such a way that it is not possible for intake and exhaust air from the inverter to be
drawn into the air intake and exhaust of other devices (e.g., the transformer or other inverter).
35
POWER ELECTRONICS
5.7 Noise Levels
The Freesun inverter series are designed to be installed in an industrial environment. The inverter noise
level is below 70dBA2 at a distance of 1m from the rear part. Noise attenuation occurs as distance from
the source increases.
2
It is possible to reduce the sound level reducing the fan speed, only when the inverter is operating with lower ambient
conditions. For additional information consult Software and Programming manual.
36
POWER ELECTRONICS
6 WIRING ACCESS AND CONNECTIONS
All cable connections to the Freesun HEC-UL and HEC-UL+ must be installed with conduit hubs or fittings
rated as 3, 3S, 4, 4X, 6 or 6P according to UL 514B that ensure that moisture and dust does not enter the
inverter.
The inverter is designed for either floating or grounded PV installations. If the
photovoltaic field installation is designed with either positive or negative poles
connected to the ground, the pole ground connection must be connected within the
inverter, specifically by means of the GFDI. For grounded arrays, do not connect the
PV array to ground at any other point in the system (i.e. Photovoltaic panels, String
Supervisor, etc...). Otherwise, the GFDI overcurrent monitoring will be compromised.
Fastening hardware is not provided by Power Electronics. The following tables summarize the
recommended fastening hardware.
Terminal lug material
Terminal lug diameter
Bolts and nuts metric
Tightening torque
Ground connection
DC connection
Tightening torque
Tightening torque
AC connection
Copper, Copper-Clad Aluminum
or Aluminum
11mm/0.43in
M8 (1/4)
8.11lb/ft (11Nm)
2-NEMA Copper, Copper-Clad
Aluminum or Aluminum
14mm/01/2in (13mm/01/2in with
external Disconnecting Unit)
M12 (3/8)
25.81lb/ft (35Nm)
2-NEMA Copper, Copper-Clad
Aluminum or Aluminum
14mm/01/2in
M12 (3/8)
25.81lb/ft (35Nm)
Paralleled conductors (AC phase, DC input, neutral, grounded circuit conductor,
equipment grounding conductor, or equipment bonding jumper) shall comply with all
of the following:





Be the same length.
Consist of the same conductor material.
Be the same size in circular mil area.
Have the same insulation type.
Be terminated in the same manner.
WIRING ACCESS AND CONNECTIONS
37
POWER ELECTRONICS
6.1 Ground connection
Before connecting the AC and DC power connections, be sure that the chassis of the inverter is
connected to ground through the dedicated terminals. The ground terminals are located in the right side
and in the left side of the inverter. Ground terminals are labeled with the appropriate ground connection
symbol.
For safety reasons, measure the ground resistance of the plant itself. The
ground resistance must be determined prior to the first start up of the
Plant.
It is installer’s responsibility to provide code compliant grounding
conductor.
WARNING
When connecting the earth grounding electrode, ensure that all connected
cables are securely tight with adequate strain relief. The specified torque
for the M8 (1/4) PE terminals is 8.11lb/ft (11Nm).
System grounding, as required by sections 690.41, 690.42 and 690.43 of
the National Electric Code is the responsibility of the installer. Input and
output circuits are isolated from the enclosure and the system grounding.
The following picture shows the PE connection of the inverter:
LETTER
Distance
mm
in
A
365
143/8
B
100
315/16
C
90
335/64
D
180
73/32
E
390
1523/64
Figure 6.1 PE connections [mm/in]
38
POWER ELECTRONICS
6.2 DC connections
An active power source is connected. This means that, regardless of the operating mode
of the inverter, there may be voltage present, either from the photovoltaic generator
and/or the FREESUN. This is especially important to consider when disconnecting
particular parts of the system. The Disconnecting Unit offers the possibility to isolate all
the inverter from the DC voltage.
As standard the isolation monitoring system is set at 1kΩ, this value is adjusted to
compliance with UL 1741.
In both the HEC-UL and HEC-UL+ inverters, the DC cables will be routed through the metallic panel
situated in the bottom part of the inverter Disconnecting Unit and connected to the input plate. Each cable
must be routed in the inverter only with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to
UL 514B. Cables must be brought from beneath the inverter.
6.2.1 DC connection for HEC-UL+ Inverters
The metallic panel measurements for cable access are:
LETTER
Distance
mm
in
A
330
13
B
130
51/8
C
250
927/32
D
650
2519/32
Figure 6.2 HEC-UL+ DC cables access
The removable panels are delivered NOT pre-drilled or pre-marked. The installer is responsible
for installing the proper knockouts and water tight fittings in the glad plates.
Use only the bottom removable panel to route the DC cables.
The input configuration and the fuses value must be selected according to the PV
installation characteristics and meet all code requirements. It is the responsibility
of the installer to select the proper overcurrent values.
39
POWER ELECTRONICS
The next figure illustrates the DC connection of the inverter.
LETTER
Distance
mm
in
LETTER
Distance
mm
in
A
375
1449/64
G
300
1113/16
B
350
1325/32
H
108
41/4
C
325
1251/64
I
45
13/4
D
275
1053/64
J
45
13/4
E
50
2
K
Ø14
Ø035/64
F
90
335/64
Figure 6.3 DC input connection in the Disconnecting Unit module
The DC busbars are aluminum. The connections should be made based on the
following recommendations.
 The maximum number of cables per fuse holder is two, one per side.
 Before connecting the cables, clean the contact surfaces with a clean cloth
and ethanol cleaner.
1/2
 It is recommended to use Ø14/0 copper, aluminum or copper-clad aluminum
2-NEMA terminal lugs.
 Use M12 (3/8) bolts and nuts, and apply a torque of 25.81lb/ft (35Nm).
 Use a spring washer and a fender washer between the nuts or bolts head and
the busbar or terminal lug.
 Use copper, aluminum or copper-clad aluminum 90°C min cables with a
minimum rated voltage of 1000V.
The voltage on each of the main DC cables should be identical and the PV
generator must never exceed the maximum permissible inverter input voltage of
1000Vdc. Otherwise the inverter could be damaged when connected.
Refer to NEC section 310 for proper cable sizing based on maximum current, maximum ambient
temperature and cable placement.
40
POWER ELECTRONICS
6.2.2 DC connection for HEC-UL Inverters
The metallic panel measurements for cables access are:
Figure 6.4 HEC-UL DC cables access [mm/in]
The removable panels are delivered NOT pre-drilled or pre-marked. The installer is responsible
for installing the proper knockouts and water tight fittings into the glad plates.
Use only the bottom removable panel to route the DC cables.
The input configuration and the fuse values must be selected according to the PV
installation characteristics and meet all code requirements. It is the responsibility
of the installer to select the proper overcurrent values.
Up to 1,000Vdc may be present on the solar array. Use LOTO procedures to
ensure the system is safely deenergized prior to making connections
41
POWER ELECTRONICS
The next figure illustrates the DC connection of the inverter.
LETTER
Distance
mm
in
LETTER
Distance
mm
in
A
160
619/64
I
150
529/32
B
220
821/32
J
450
1723/32
C
280
11
K
490
1919/64
D
430
1659/64
L
108
41/4
E
1580
6213/64
M
45
13/4
F
1040
41
N
45
13/4
G
500
1911/16
O
Ø13
Ø033/64
H
300
1113/16
Figure 6.5 DC input connection in the Disconnecting Unit cabinet
The DC busbars are aluminum. The connections should be done as the following
recommendations.
 The maximum number of cables per fuse holder is two, one per side.
 Before connecting the cables, clean the contact surfaces with a clean cloth and
ethanol cleaner.
1/2
NEMA-2 terminal lugs.
 Use a spring washer and a fender washer between the nuts or bolts head and
the busbar or terminal lug.
 Use copper, aluminum or copper-clad aluminum 90°C min cables with a
minimum rated voltage of 1000V.
The voltage on each of the main DC cables should be identical and the PV
generator must never exceed the maximum permissible inverter input voltage of
1000Vdc. Otherwise the inverter could be damaged when connected.
Refer to NEC section 310 for proper cable sizing based on maximum current, maximum ambient
temperature and cable placement.
42
POWER ELECTRONICS
6.3 AC Connection
The main AC circuit inside the inverter is configured to connect a Dy11 transformer. For
proper operation, do not connect the transformer neutral (Xo) to ground.
High voltages may be present in the voltage-carrying components of the low-voltage and
medium-voltage grids. The installer is responsible to work under the all locally applicable
safety regulations and LOTO procedures for low-voltage and medium-voltage operation.
• Ensure that the AC module circuit breakers are disconnected and safely lockedout/tagged out.
• Disconnect the inverter from the DC sub-combiners.
• Ensure that system is deenergized prior to making connections.
The AC cables will be routed through the metallic panels situated in the bottom part of the AC module
cabinet. All of the AC cables must be routed in the inverter only with conduit hubs or fittings rated as 3,
3S, 4, 4X, 6 or 6P according to UL 514B.
LETTER
A
B
C
D
DISTANCE
mm
in
420
1617/32
240
929/64
120
423/32
130
51/8
Figure 6.6 AC module cabinet cables access
The cable length between the AC termination points must not exceed a maximum of 15 m (49ft) and the
cables must be the same type to avoid unexpected operation.
The cables for the three phase AC connection must have sufficient ampacity to prevent overheating and
voltage drops. AC cables must meet all applicable local codes. Only the use of copper, aluminum or
copper clad aluminum cables is permitted.
43
POWER ELECTRONICS
The AC busbars are aluminum. The connections should be made with the following
recommendations.
 Before connecting the cables, clean the contact surfaces with a clean cloth and
ethanol cleaner.
1/2
NEMA-2 terminal lugs.
 Use a spring washer and a fender washer between the nuts or bolts head and the
busbar or terminal lug.
 Use copper, aluminum or copper-clad aluminum 90°C min cables with a minimum
rated voltage of 1000V.
Use only the bottom removable panel to route the AC cables.
Figure 6.7 AC output connection busbars [mm/in]
The AC voltage from the inverter is configurable (208Vac, 330Vac, 360Vac or 390Vac) depending on the
maximum output power and the MPPt voltage range. The installer is responsible for the selection of a
power transformer considering the local regulations and the following recommendations:





Recommended transformer configuration is Dy11.
Input Voltage according to the rated output voltage of the inverter.
Output voltage according to the connection point at the medium voltage side.
Transformer Rated Power according to the delivered rated output power of the inverter.
Environmental ratings according to installation requirements.
The maximum number of cables that can be connected to the AC module busbars is 6 cables per phase.
44
POWER ELECTRONICS
6.4 Overvoltage protections
The Freesun HEC-UL and HEC-UL+ series inverters, as shown in the functional diagram, are equipped
with internal AC and DC overvoltage protection. Optionally, the inverter can also be equipped with
lightning protection.
The AC main circuit overvoltage protection is equipped as standard with three surge suppression
fuses (refer to figure 7.1 for location in the inverter). The main characteristics are shown in the following
tables:
AC OVERVOLTAGE
PROTECTION
SURGE SUPPRESSION
FUSES
Nominal Voltage
(Un)
Voltage
Protection
Level (Up)
Nominal
Discharge
Current
8/20 µsec
(In)
1000Vac
4.2kV
15kA
Type
Voltage
Rating (Vac)
8/20 µsec
Surge Rating
VSP
Size: 10x38mm
600V
15kA
The DC overvoltage protection is installed in the inverter. The DC surge suppression is built-in
removable modules that include a fault indication window. The DC surge suppression modules can be
replaced using the top and bottom pushbuttons as shown in the following figure.
Figure 6.8 DC overvoltage protection
The main characteristics of the modules are shown in the following table:
DC OVERVOLTAGE
PROTECTION
Nominal Voltage
(Un)
Voltage
Protection
Level (Up)
8/20 µsec
Surge Rating
1000Vdc
4kV
40kA
Furthermore, auxiliaries include an overvoltage protection. The main characteristics of the auxiliaries
overvoltage protection are shown in the following table:
AUXILIARIES
OVERVOLTAGE
PROTECTION
Nominal Voltage
(Un)
Voltage
Protection
Level (Up)
8/20 µsec
Surge Rating
275Vac
1.5kV
12.5kA
45
POWER ELECTRONICS
6.5 Ground Fault protections
For ungrounded PV installations, the inverter is equipped with an insulation monitor as standard. This
detector monitors the insulation resistance of the array to ground, providing early indication of faults
before leakage current may even be present. If the inverter is configured with two or more MPPt, the DC
overvoltage and insulation monitor protection will be replicated in each MPPt. For more information,
consult Power Electronics. The main features of the insulation monitor are shown in the next table:
Rated Voltage
(V)
Set response
value
1100Vdc
2kΩ
INSULATION MONITOR
For grounded PV installations, the inverter is equipped with a GFDI as standard. Do not connect to
ground any other equipment (Eg. Photovoltaic panels, String Supervisor, neutral terminal of the inverter,
etc...). Otherwise, the 5A overcurrent protection provided by the GFDI would not be effective. In
grounded PV installations the inverter can only be configured with one MPPt.
6.6 Main circuit protections
HEC-UL and HEC-UL+ inverters include AC mains circuit software and hardware protections. For more
information about software protections consult the Programming and software manual.
Each inverter includes a circuit breaker in the AC side. The circuit breaker rating is described in the
following table:
Rated Current
(A)
Breaking
Capacity
(kA)
2500A
100kA
AC MODULE CIRCUIT
BREAKER
Each inverter module includes a circuit breaker in the AC side. The circuit breaker rating is described in
the following table:
Rated Current
(A)
Breaking
Capacity
(kA)
300A
65kA
MODULES AC CIRCUIT
BREAKER
Each inverter module includes two DC fuses in their DC input. The main characteristics are shown in the
following table.
MODULE DC FUSES
Type
Rated Current
(A)
Breaking
Capacity (kA)
Screw to blade
SPFJ300
Size: Class J
300A
10kA
Each inverter module includes four DC measure protection fuses (located in figure 7.1, number 8). Two
for panels DC voltage measure and two for DC bus voltage measure. The main characteristics are shown
in the following table.
DC MEASURE
PROTECTION FUSES
46
Type
Rated Current
(A)
PV
amp rating: A10F
Size: 10x38mm
1A
Breaking
Capacity (kA)
10 to 30kAdc
depending on
the fuse model
POWER ELECTRONICS
6.7 Installation protection
For the compliance of the section 690.13 of the National Electric Code ANSI/NFPA 70 it is mandatory
that “Means shall be provided to disconnect all current-carrying dc conductors of a photovoltaic system
from all other conductors in a building or other structure”. Power Electronics offers a Disconnecting Unit
integrated in HEC-UL+ and external in HEC-UL Series inverters that includes upstream DC fuses and
circuit breakers with the following characteristics:
NEC’s Max. PV current (A) [1]
#Fuse /
Disc.
Rating
Disconnect
#1 Disc.
Rating (A)
Fuse (A)
& pole
1250
10
160
1600
1250
10
125
1000
1250
10
100
800
1250
10
90
720
1250
9
200
1250
1250
9
160
1152
1250
9
125
900
1250
9
100
720
1250
8
200
1250
1250
8
160
1024
1250
8
125
800
1250
7
250
1250
1250
7
200
1120
1250
7
160
896
1250
7
125
700
1250
6
300
1250
1250
6
250
1200
1250
6
200
960
1250
6
160
768
1250
5
350
1250
1250
5
300
1200
1250
5
250
1000
1250
5
200
800
1250
4
400
1250
1250
4
350
1120
1250
4
300
960
1250
4
250
800
1250
3
400
960
1250
3
350
840
1250
3
300
720
700
9
100
700
700
9
90
648
700
9
80
576
700
9
70
504
700
8
125
700
700
8
100
640
700
8
90
576
700
8
80
512
700
8
70
448
700
7
160
700
700
7
125
700
700
7
100
560
700
7
90
504
700
7
80
448
700
6
160
700
700
6
125
600
700
6
100
480
700
5
200
700
700
5
160
640
700
5
125
500
700
5
100
400
700
4
400
700
700
4
350
700
700
4
300
700
700
4
250
700
700
4
200
640
#2 Disc.
#3 Disc.
2500
2000
1600
1440
2500
2304
1800
1440
2500
2048
1600
2500
2240
1792
1400
2500
2400
1920
1536
2500
2400
2000
1600
2500
2240
1920
1600
1920
1680
1440
1400
1296
1152
1008
1400
1280
1152
1024
896
1400
1400
1120
1008
896
1400
1200
960
1400
1280
1000
800
1400
1400
1400
1400
1280
3750
3000
2400
2160
3750
3456
2700
2160
3750
3072
2400
3750
3360
2688
2100
3750
3600
2880
2304
3750
3600
3000
2400
3750
3360
2880
2400
2880
2520
2160
2100
1944
1728
1512
2100
1920
1728
1536
1344
2100
2100
1680
1512
1344
2100
1800
1440
2100
1920
1500
1200
2100
2100
2100
2100
1920
NEC’s PV Continuous current (A) [2]
#4 Disc. #1 Disc.
2800
2592
2304
2016
2800
2560
2304
2048
1792
2800
2800
2240
2016
1792
2800
2400
1920
2800
2560
2000
1600
2800
2800
2800
2800
2560
1250
1000
800
720
1250
1152
900
720
1250
1024
800
1250
1120
896
700
1250
1200
960
768
1250
1200
1000
800
1250
1120
960
800
960
840
720
700
648
576
504
700
640
576
512
448
700
700
560
504
448
700
600
480
700
640
500
400
700
700
700
700
640
#2 Disc.
#3 Disc.
2500
2000
1600
1440
2500
2304
1800
1440
2500
2048
1600
2500
2240
1792
1400
2500
2400
1920
1536
2500
2400
2000
1600
2500
2240
1920
1600
1920
1680
1440
1400
1296
1152
1008
1400
1280
1152
1024
896
1400
1400
1120
1008
896
1400
1200
960
1400
1280
1000
800
1400
1400
1400
1400
1280
3750
3000
2400
2160
3750
3456
2700
2160
3750
3072
2400
3750
3360
2688
2100
3750
3600
2880
2304
3750
3600
3000
2400
3750
3360
2880
2400
2880
2520
2160
2100
1944
1728
1512
2100
1920
1728
1536
1344
2100
2100
1680
1512
1344
2100
1800
1440
2100
1920
1500
1200
2100
2100
2100
2100
1920
Disconnecting Unit
Max. continuous current (A) [3]
#4 Disc. #1 Disc.
2100
1944
1728
1512
2100
1920
1728
1536
1344
2100
2100
1680
1512
1344
2100
1800
1440
2100
1920
1500
1200
2100
2100
2100
2100
1920
1000
800
640
576
1000
922
720
576
1000
819
640
1000
896
717
560
1000
960
768
614
1000
960
800
640
1000
896
768
640
768
672
576
560
518
461
403
560
512
461
410
358
560
560
448
403
358
560
480
384
560
512
400
320
560
560
560
560
512
#2 Disc.
#3 Disc.
#4 Disc.
2000
1600
1280
1152
2000
1843
1440
1152
2000
1638
1280
2000
1792
1434
1120
2000
1920
1536
1229
2000
1920
1600
1280
2000
1792
1536
1280
1536
1344
1152
1120
1037
922
806
1120
1024
922
819
717
1120
1120
896
806
717
1120
960
768
1120
1024
800
640
1120
1120
1120
1120
1024
2000
2000
1920
1728
2000
2000
2000
1728
2000
2000
1920
2000
2000
2000
1680
2000
2000
2000
1843
2000
2000
2000
1920
2000
2000
2000
1920
2000
2000
1728
1680
1555
1382
1210
1680
1536
1382
1229
1075
1680
1680
1344
1210
1075
1680
1440
1152
1680
1536
1200
960
1680
1680
1680
1680
1536
1680
1555
1382
1210
1680
1536
1382
1229
1075
1680
1680
1344
1210
1075
1680
1440
1152
1680
1536
1200
960
1680
1680
1680
1680
1536
47
NEC’s Max. PV current (A) [1]
#Fuse /
Disc.
Rating
Disconnect
#1 Disc.
Rating (A)
Fuse (A)
& pole
700
4
160
512
700
4
125
400
700
3
400
700
700
3
350
700
700
3
300
700
700
3
250
600
700
3
200
480
700
2
400
640
700
2
350
560
700
2
300
480
700
2
250
400
400
7
80
400
400
7
70
392
400
6
90
400
400
6
80
384
400
6
70
336
400
5
100
400
400
5
90
360
400
5
80
320
400
4
125
400
400
4
100
320
400
3
200
400
400
3
160
384
400
2
300
400
400
2
250
400
400
2
200
320
250
4
80
250
250
4
70
224
250
3
125
250
250
3
100
240
250
3
90
216
250
3
80
192
250
3
70
168
250
2
160
250
250
2
125
200
250
2
100
160
250
2
90
144
250
2
80
128
250
2
70
112
#2 Disc.
#3 Disc.
1024
800
1400
1400
1400
1200
960
1280
1120
960
800
800
784
800
768
672
800
720
640
800
640
800
768
800
800
640
500
448
500
480
432
384
336
500
400
320
288
256
224
1536
1200
2100
2100
2100
1800
1440
1920
1680
1440
1200
1200
1176
1200
1152
1008
1200
1080
960
1200
960
1200
1152
1200
1200
960
750
672
750
720
648
576
504
750
600
480
432
384
336
POWER ELECTRONICS
NEC’s PV Continuous current (A) [2]
#4 Disc. #1 Disc.
2048
1600
2800
2800
2800
2400
1920
2560
2240
1920
1600
1600
1568
1600
1536
1344
1600
1440
1280
1600
1280
1600
1536
1600
1600
1280
1000
896
1000
960
864
768
672
1000
800
640
576
512
448
512
400
700
700
700
600
480
640
560
480
400
400
392
400
384
336
400
360
320
400
320
400
384
400
400
320
250
224
250
240
216
192
168
250
200
160
144
128
112
#2 Disc.
#3 Disc.
1024
800
1400
1400
1400
1200
960
1280
1120
960
800
800
784
800
768
672
800
720
640
800
640
800
768
800
800
640
500
448
500
480
432
384
336
500
400
320
288
256
224
1536
1200
2100
2100
2100
1800
1440
1920
1680
1440
1200
1200
1176
1200
1152
1008
1200
1080
960
1200
960
1200
1152
1200
1200
960
750
672
750
720
648
576
504
750
600
480
432
384
336
Disconnecting Unit
Max. continuous current (A) [3]
#4 Disc. #1 Disc.
1536
1200
2100
2100
2100
1800
1440
1920
1680
1440
1200
1200
1176
1200
1152
1008
1200
1080
960
1200
960
1200
1152
1200
1200
960
750
672
750
720
648
576
504
750
600
480
432
384
336
410
320
560
560
560
480
384
512
448
384
320
320
314
320
307
269
320
288
256
320
256
320
307
320
320
256
200
179
200
192
173
154
134
200
160
128
115
102
90
#2 Disc.
#3 Disc.
#4 Disc.
819
640
1120
1120
1120
960
768
1024
896
768
640
640
627
640
614
538
640
576
512
640
512
640
614
640
640
512
400
358
400
384
346
307
269
400
320
256
230
205
179
1229
960
1680
1680
1680
1440
1152
1536
1344
1152
960
960
941
960
922
806
960
864
768
960
768
960
922
960
960
768
600
538
600
576
518
461
403
600
480
384
346
307
269
1229
960
1680
1680
1680
1440
1152
1536
1344
1152
960
1280
941
960
922
806
960
864
768
960
768
960
922
960
960
768
600
538
600
576
518
461
403
600
480
384
346
307
269
[1] NEC’s Maximum PV current = Icc • 1.25 • 1.25.
[2] NEC’s PV continuous current = Icc • 1.25.
[3] The FSDU is intended to be connected to FS___CU units with the maximum continuous current indicated in the table. Differences between
NEC’s PV Continuous current and Disconnecting unit maximum continuous current are caused by the different DC:AC ratios required in PV
fields.
The input configuration and the fuses value must be selected according to the PV installation design
requirements. It is responsibility of the installer to select the correct value. The breaking capacity of the
fuses is 10kA and the rated voltage 1000Vdc. For more information about a correct sizing of the fuses
consult Power Electronics.
Note: The solar panels short-circuit current is significantly below these values.
The backfeed short-circuit currents available from the inverter are below the rated currents of the DC
fuses and AC circuit breakers.
6.8 Auxiliary Power Source
The HEC-UL and HEC-UL+ inverters have as standard an internal power transformer (situated in the AC
module), that provides 3x400Vac 60Hz internal power supply for control and ventilation circuit. The
internal supply is not available for customer equipment.
Power Electronics inverters also have 3x208Vac 60Hz supply for external loads which provide up to
2kVA to an external system (Lighting, String supervisors, MeteoStation and others).
48
POWER ELECTRONICS
6.9 External Control Connections
It is possible to command the inverter prepared for external power supply. In this case, the installer
should route the cables together through the wiring conduit, then route the cables as close as possible to
the right side chassis to reduce the internal interference emission. Finally, drill the bottom panel of the AC
module and protect it only with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL
514B. For more information, consult Power Electronics.
6.10 Control connection
This section includes general information and recommendations about the inverter communication wiring.
For further information about accessories connection (Power Control Interface, String Supervisor, Ripple
control receiver, Freesun Data Center, Meteo Stations, ...), please consult the appropriate user manual.
Consider the following recommendations prior to the control wiring installation:






It is recommended to use shielded twisted cable with the shield connected to ground on one side
only.
The installer should route the cables through the bottom panel of the AC module cables access
plate and protect them with conduit hubs or fittings rated as 3, 3S, 4, 4X, 6 or 6P according to UL
514B to ensure the inverter degree of protection.
The installer should route the cables through the wiring duct up to the module control board.
Control wiring should be installed as far as possible from the power wiring.
If it is necessary to cross power cables and control cables, these crossings must be done in a
perpendicular way.
Do not use control voltages of 24VDC and 208/120VAC over the same multiple wire cable or
cable gutter.
Figure 6.9 Control wiring restrictions
Internally, each inverter module communicates with the master through CAN communication and
synchronizes by cable.
Externally, the modules can communicate with other devices through RS232 / RS485 / USB / Ethernet
(Modbus RTU, Ethernet TCP/IP protocols).
To connect and power Power Electronics accessories, follow the installation instructions of the respective
manufacturers (ripple control receiver, router, meteorological stations …).
49
POWER ELECTRONICS
Information about digital I/O and analog I/O is described below. Two analog sensors and one PT100
temperature sensor can be connected to each module of the Freesun HEC-UL and HEC-UL+. The
maximum section for the control cables is 2.5mm² and the tightening torque is 0.4Nm.
Figure 6.10 Control terminals for the user
For further information about setting the input and output signals, please refer to the Freesun
Programming and Software manual.
50
POWER ELECTRONICS
7 COMMISSIONING
Before commissioning, all work performed on the device should be thoroughly checked. Verify that the DC
and AC voltages conform to the limits allowed on the inverter.
7.1 Initial Conditions
WARNING
Before starting the inverter, ensure that the grounding resistance is within site
specified limits.
Otherwise, the operator may be at risk of an electric shock.
Use safety glasses and adequate PPE during operation with the door
opened.
7.2 First Time Switch On
Verify all connections have been made according to the previous “Wiring Access and Connection”
section.
Auxiliary control voltage switches on:
1.
Switch on the auxiliary circuit breakers of each inverter module. These circuit breakers
include the ones for the fans, soft load, input and output voltage measurement, auxiliary
control voltage protection, etc. (See figure below 1).
2.
Verify that the main AC circuit breaker of each inverter module is switched on. The main
circuit breaker is located in the rear of the inverter module. (See figure below 2).
3.
Switch on the following breakers located in the AC module

Auxiliary control voltage circuit breaker.

Auxiliary power source circuit breaker.

RCD circuit breaker.

Main auxiliary circuit breaker.
4.
When all the breakers are switched ON, the inverter is powered with the auxiliary control
voltage and the display unit is illuminated, indicating the state of each inverter module. (See
figure below 3, 10).
Voltage measurement:

Check that the AC voltage corresponds with the output AC voltage configured in the inverter.

Check that the AC phase sequence corresponds with the inverter phase sequence.

Check that the DC voltage is below the maximum DC voltage in each MPPT.
Power switch on:
5.
Close the inverter’s doors.
6.
Remove Lockout/Tagout locks and safeties.
7.
For the compliance of the section 690.13 of the National Electric Code ANSI/NFPA 70 it is
mandatory to use additional DC switches or fuses to disconnect the inverter from the PV
installation. These DC switches are located in the Disconnecting Unit. Connect all of them
and check that DC voltage is present in the input DC busbar of each MPPT of the inverter.
In case the installation is equipped with String Supervisors by Power Electronics, ensure
that the DC switches are connected.
8.
Check that the medium voltage switchgear is switched on, so that the AC output of the
inverter is connected to the grid.
9.
Open the AC module window and switch on the main circuit breaker located in the output of
the AC module of the inverter. (See figure below 4).
COMMISSIONING
51
POWER ELECTRONICS
10. Finally, turn on the AC module switch key by selecting the “ON” position, allowing the
beginning of the plate connection process (shown in the display as BSC status).
11. After the appropriate delay (300 seconds minimum per UL-1741), the DC contactor (6) of the
modules will close, connecting the inverter to the DC side.
12. If the voltage (UAC), frequency (fAC) and DC input voltage (UPV) are within the acceptance
range, the AC soft charge contactor (7) will be activated. After a short period of time, the
main AC contactor (5) will be activated. In this way, the MPPT of the inverter selected is
completely connected in both AC and DC sides, injecting power to the grid.
13. Inverters with multiple MPPT, please repeat steps from 10 to 12.
Figure 7.1 FREESUN internal view. Inverter modules rear view (left), front view (center) and AC module (right)
NUMBER
1
2
3
4
5
6
7
8
9
10
52
COMMISSIONING
DESCRIPTION
Auxiliary circuit Breakers
Main module AC circuit breaker
Auxiliary control power supply and auxiliary power
source circuit breakers
Main AC Circuit Breaker
AC Module contactor
DC contactor
Soft charge contactor
DC measure protection fuses
Main circuit surge arrester and fuses
Main auxiliary circuit breaker
POWER ELECTRONICS
7.3 Switch Off
FREESUN inverter maintenance and operation tasks may be only performed by qualified personnel. To
safely deenergize the inverter, follow the next steps.
Standard Switch off:
Turn off the AC module switch key by selecting the “OFF” position. The AC contactor (5), the DC
circuit breaker (6) of the modules will switch off and the bus discharge process is enabled during 30
seconds.
Wait 5 minutes for the bus caps to discharge.
Maintenance tasks switch off:
1. Turn off the AC module switch key by selecting the “OFF” position. The AC contactor (5), the DC
circuit breaker (6) of the modules will switch off and the bus discharge process is enabled during 30
seconds. Wait 5 minutes for the bus caps to discharge.
2. Disconnect the main AC circuit breaker (4) using its specific window.
3. Disconnect main DC switch (Disconnecting Unit). Do not leave the inverter DC busbar energized.
Use site approved LOTO procedures.
4. Open the inverter’s doors and disconnect Auxiliary circuit breakers (3, 10).
CAUTION
Voltage present on the DC bus.
DC busbars and fuses of the Disconnecting Unit remain connected to the photovoltaic cables.
Hazard voltages may be present.
The Freesun inverter contains capacitors on the AC and DC sides that must discharge once the device
has been switched off. After switching off, there are dangerous accidental-contact voltages present within
the device, the discharge time of the capacitors is 5 minutes.
COMMISSIONING
53
POWER ELECTRONICS
8 PREVENTIVE MAINTENANCE
Freesun HEC-UL inverter requires minimum maintenance and supervision during its lifetime. Nevertheless
the inverter consists of advanced semiconductor, electric and electronic devices. The temperature,
humidity, dust, vibration, pollution and normal wear can reduce system efficiency.
Ambient
conditions
Module
ALL
Input and
output power
Power
connections
Are the ambient temperature
and the humidity within
specification?
Are there any abnormal
noises or vibrations?
Is the input and output power
correct?
Are the Power terminals
correctly fastened?
Conductor/
Cable
Fuses
LOW VOLTAGE MAIN CIRCUIT
IGBT's module
Correct
capacitor
Inductances
Transformer
AC contactor
and circuit
breakers
Insulation
resistance in
grounded
installations
54
CRITERION
INSTRUMENT OF
MEASUREMENT
Thermometer,
Temperature:
Hygrometer,
-4ºF to +122ºF (-20ºC to +50ºC).
Datalogger.
o
Visual and audible.
There are no anomalies.
o
Measure the displayed
voltage between terminals
L1, L2, L3 and between
positive (+) and negative (-)
DC poles.
o
Verify power connections one
week after start-up.
Annually check that the power
Measure the temperature and
Infrared
connections temperatures are
torque of the power
thermometer.
homogeneous and below 70ºC.
connections.
Torque key.
Check that the bolts are torqued
properly as indicated in the
manual.
Digital multimeter.
Tester.
Display.
o
Visual check.
No anomaly.
o
Visual check.
If the cabinet paint is scratched
or removed, it could appear
oxide and corrosion.
o
Visual check.
No anomaly.
Visual check.
No anomaly.
Visual check.
Disconnect the output power
cables of the inverter and
measure the resistance value
between: L1,L2,L3  DC(+),
DC(-) with a tester > 10k
No anomaly.
o
Check cabinet paint for
visual damage or corrosion.
Check the bottom connection
metal panels for pools, dust
or rubbish.
Is the conductor corroded?
Is the isolation of the cable
damaged?
Is there any fuse melted?
INSPECTION METHOD
External measurement.
o
Check sealing on the doors.
Check doors, gratings and
cabinet for visual damages.
Cabinet
Integrity and
cleanness
2 years
INSPECTION
3 months
PERIOD
INSPECTION
ELEMENT
Weekly
INSPECTION
SITE
For maximum equipment usage, follow the recommended maintenance procedures summarized in the
next table.
o
o
o
Check the resistance value
between each one of the
terminals
Have fluid leaks been
observed? Is the capacitor
well fastened? Is any dilation
or retraction sign observed?
Measure the capacitance
Is there any liquid leak?
Is there any overheated
point?
Check for visual damage.
point?
Is the contactor damaged?
Are the circuit breakers
placed in each module
damaged?
Is there any earth leakage?
Is the grounded pole
conductor damaged?
PREVENTIVE MAINTENANCE
o
Digital multimeter.
Analog tester.
o
Visual check.
No anomaly
Instrument for
Measure the capacitance with Capacitance higher than 85% of measuring
a proper instrument.
rated capacitance.
capacity.
o
Visual check.
Measure the surface and
connectors’ temperature.
Visual check.
Measure the surface and
connectors’ temperature.
No anomaly.
Check that the temperature is
No anomaly.
Check that the temperature is
Disconnect the power supply.
Reset the circuit breaker with
the test button.
No anomaly.
Disconnect the GFDI fuse.
Measure the resistance
between the grounded phase
and earth.
The resistance value is above
1kΩ.
o
o
o
o
o
o
Infrared
thermometer.
Infrared
thermometer.
Digital multimeter.
Analog tester.
DISPLAY
COOLING SYSTEM
Cooling fans
Are there any abnormal
noises or oscillations?
module?
Inlet and Outlet Are the gratings clogged by
Gratings
plastics or rubbish?
2 years
INSPECTION
3 months
PERIOD
INSPECTION
ELEMENT
Weekly
INSPECTION
SITE
POWER ELECTRONICS
INSPECTION METHOD
CRITERION
o
Disconnect the power supply
(OFF) and rotate the fans
manually.
Check the connections.
Check IGBT temperature.
Fan should rotate effortlessly.
No anomaly.
o
Visual check.
No anomaly.
Dust filters
Are the dust filters
obstructed?
o
Visual check.
No anomaly.
Measurement
Are the voltage and current
displayed values correct?
o
Check the reading instrument
with an external
measurement.
Check the specified values and
the control values.
INSTRUMENT OF
MEASUREMENT
Voltage meter /
Current meter etc.
Note: Long life of the main components is based on a continuous operation for the stipulated load. These conditions
can change based on the environmental conditions.
CAUTION
Voltage present on the DC bus.
It should be taken into account that the DC busbars and fuses of the Disconnecting Unit remain
connected to the photovoltaic cables.
The device contains capacitors on the AC and DC sides that must discharge once the device has been
switched off. After switching off, there are dangerous accidental-contact voltages present within the
device, the discharge time of the capacitors is 5 minutes.
PREVENTIVE MAINTENANCE
55
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Hardware and Installation Manual

Transcription

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