GFC SERIES Low ProFileTM 400 Hz AND 28 VDC

GFC SERIES Low ProFileTM
400 Hz AND 28 VDC
GROUND POWER UNIT
APPLICATION:
Since its beginning in 1960, Unitron has specialized in the design
and development of reliable solid-state power systems. Through
an innovative design, advanced self-diagnostic systems (BITE) and
modular construction, Unitron products assure maximum power
availability and minimal repair time.
The Low ProFileTM Series includes 400 Hz and 28 VDC converters
designed to provide aircraft ground power in “low profile” applications, such as under passenger boarding bridges, in maintenance
hangars, or on flight lines. The dual output AC/DC GPU provides
simultaneous AC and DC power from a single unit. Because a
single unit can do the work of two, Unitron’s AC/DC GPU reduces
operating and maintenance costs, and saves valuable space in
the hangar or on the ramp.
In addition to fixed GPUs, Unitron offers 400 Hz, 28 VDC and
combination AC/DC units in towable, mobile and bridge-mounted
configurations.
HORIZONTAL CONFIGURATION
OPTIONS:
STANDARD FEATURES:
 MIL-STD-704F, ARP 5015, DFS 400 and
ISO 6858 Compliant
 Indoor/Outdoor (Hangar/Ramp) Use
 Automatic Input Line Monitoring
 Automatic Line Drop Compensation
(ALDC)
 Emergency Mushroom “OFF” Switch
 Dual Output with Individual Safety
Disconnect
 Alternate Input Voltages Available (specify)
 Input Frequency 50 Hz
 AC Output Power Cable with Plug (30 or 60 foot lengths)
 DC Output Power Cable with Plug (20, 30 or 60 foot
lengths)
 Front Panel AC and DC Voltage Adjust (± 15%)
 No Break Power Transfer (NBPT) Compatible
 Low Input Current Distortion (12-pulse)
 300% Overload (dependent on rating)
 Alternate Mounting Configurations Available
 Built-in Maintenance Diagnostics
 Analog Control Panel
MECHANICAL SPECIFICATIONS:
 Output Voltage and Current Monitoring
Size:
See Figure 1
Weight:
37.5 kVA = 865 lbs. (392 kgs.)
60.0 kVA = 950 lbs. (431 kgs.)
75.0 kVA = 995 lbs. (451 kgs.)
90.0 kVA = 1075 lbs. (487 kgs.)
Construction:
Indoor/Outdoor
Cooling:
Forced Convection
 Internal Elapsed Time Meter
 Front Panel Summary Fault Indicators
**This product was manufactured in a plant
whose quality management system is registered
to ISO 9001:2000.
GENERAL SPECIFICATIONS
AC INPUT:
Voltage
Frequency
Phase Rotation
Protection
Inrush Current
480 volts, +10%, -15%, 3Ø, 3 wire plus ground
60 Hz ± 10%
Any
Over/undervoltage, loss of phase,
overcurrent, short circuit
No greater than 100% of full load current
37.5, 60, 75 or 90 kVA (specify)
150% for 5 min., 200% for 20 sec.
115/200 volts, 3Ø, 4 wire,
grounded neutral
± 1.0% under all conditions of line, balanced loads and temperature
IAW MIL-STD-704E
400 Hz ± 0.01% under all conditions
of line, load and temperature
None
± 2° for balanced loads
2.0% maximum
Overload, short circuit, over/under
voltage and safety disconnect
ENVIRONMENTAL:
Acoustical Noise
Temperature Range
Full Rated Load
Overload
Engine Start Capacity
Voltage
Voltage Regulation
450 amps continuous
600 amps for 30 minutes at 20% duty cycle
Adjustable up to 2000 amps for 20 seconds at 10% duty cycle
28 VDC, 2 wire, grounded
negative
 100% continuous rated
AC OUTPUT:
Power Rating
Overload
Voltage
Voltage Regulation
Voltage Transients
Frequency Regulation
Frequency Transients
Phase Angle Regulation
Harmonic Distortion
Protection
DC OUTPUT:
65 dBA maximum at 5 feet
-40°C to +55°C
load and ± 10%
input voltage ± 0.05%
 No load to rated load
with nominal input voltage IAW ISO 6858
 Overload with nominal
input voltage Voltage Adjust
See Start Mode literature for Model 420RDC
28 VDC ± 10%
Current Limit Adjust
Protection
200 to 2000 amps
Overload, short circuit, overvolt-
age and safety disconnect
ENERGY FACTORS:
Efficiency
Energy Efficiency Ratio
95% typical at full load,
93% typical at half load;
varies depending on
configuration and rating
20.0 typical
FIGURE 1
REV NC
GFC SERIES Low ProFileTM
AC/DC GROUND POWER UNIT (GPU)
REV. C