Unitron UFC-90M-28VDC Dual-Output AC & DC GPU – 90 kVA (AC) & 28V DC – 3-Phase Input Voltage
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The Unitron 90 kVA with 28V DC PwrKart series is a lightweight AC/DC mobile GPU for aircraft ground power applications in the hangar or ramp area. The dual-output AC/DC PwrKart provides simultaneous AC and DC power from a single unit.
Features
- IP55
- Certified to UL 1012
- Indoor/outdoor (hangar/ramp) use
- Less than or equal to 5% input current distortion at maximum load
- Automatic input line monitoring
- Advanced Integrated Display (AID) console
- 8000 event log/diagnostics
- TCP/IP/Ethernet interface (Modbus)
- Internal communication ports – USB, RJ45 (Ethernet), RS485 (Modbus), & RS232
- External communication ports – RJ45 (Ethernet) & USB
- 15% automatic line drop compensation
- Emergency power "OFF" switch
- 18" hazard area clearance
- Voltage, current, and frequency monitoring
- Front panel voltage adjust
- Elapsed time meter
- Sleep mode
- Front panel summary fault indicators
- Output current limit adjust from 150A to full rated current
- Input & output cable racks
- Input high-voltage transient protection
- Multi-language (Romanization) display – English, French, German, Italian, Portuguese, Russian, and Spanish, Others - Specify
AC Input
- Input Current Distortion: less than/equal to 5%, typically 3%
- Voltage: 380 to 480 volts, +10%, -15%, 3O, 3 or 4 wire plus ground (Alternate voltages -208V-240V 3 PH)
- Frequency: 50 – 60 Hz +/- 10%
- Phase Rotation: Any
- Protection: Overvoltage/undervoltage, loss of phase, overcurrent, short circuit. Voltage transient protection IAW IEEE C62.41.1, Location Cat. B/C
- Inrush Current: No greater than 100% of full load current
DC Output – Option 1 – UDC-420
- Full Rated Load: 425 amps continuous
- Engine Start Capacity (10% duty cycle): Adjustable up to 1,600 amps for 35 seconds, 2,000 amps for 30 seconds
- Overload (10% duty cycle): 600 amps for 1 hour, 1,000 amps for 1 minute
- Voltage: 28V DC, 2-wire, grounded negative
- Voltage Regulation:
- 100% continuous rated load and +/-10% input voltage: +/- 0.5%
- No load to rated load with nominal input voltage: IAW ISO 6858 & MIL-STD-704F
- Overload with nominal input voltage: See start mode curves
- Voltage Adjust: 28 VDC +/- 10%
- Current Limit Adjust: 150A to full rated current
- Protection: Overload, short circuit, overvoltage, and safety disconnect
- Automatic Line Drop Compensation (ALDC): 10%
DC Output – Option 2 – UDC-620
- Full Rated Load: 600 amps continuous
- Engine Start Capacity (10% duty cycle): Adjustable up to 1,600 amps for 1 minute or 2000 amps for 30 seconds
- Overload (10% duty cycle): 1,000 amps for 10 minutes
- Voltage: 28V DC, 2-wire, grounded negative
- Voltage Regulation:
- 100% continuous rated load and +/-10% input voltage: +/- 0.5%
- No load to rated load with nominal input voltage: IAW ISO 6858 & MIL-STD-704F
- Overload with nominal input voltage: See start mode curves
- Voltage Adjust: 28V DC +/- 10%
- Current Limit Adjust: 150A to full rated current
- Protection: Overload, short circuit, overvoltage, and safety disconnect
- Automatic Line Drop Compensation (ALDC): 10%
AC Output
- Power Rating: 90 kVA
- Power Factor Range: 0.5 lagging to 0.8 leading
- Overload: 100% continuous, 110% for 60 min, 125% for 10 min, 150% for 2 min, 200% for 20 sec
- Crest Factor: 1.414 +/- 3%
- Voltage: 115/200 volts, 3O, 4-wire, grounded neutral
- Voltage Adjust +/- 15% on 380-480V, 208 VAC, adjustable +/-10%
- Voltage Regulation: +/- 1.0% under all conditions of line, balanced loads, and temperature
- Voltage Transients: IAW MIL-STD-704F
- Frequency Regulation: 400 Hz +/- 0.01% under all conditions of line, load, and temperature
- Frequency Transients: None
- Phase Angle Regulation: +/- 1 degree for balanced loads; +/- 2 degree for unbalanced loads
- Harmonic Distortion: 2.0% maximum
- Protection: Overload, short circuit, overvoltage/undervoltage, and safety disconnect
- Automatic Line Drop Compensation (ALDC): 15%
Environmental
- Acoustical Noise: < 65 dBA maximum at 5 feet (1.5m)
- Temperature Range: -40°C to +55° C
- Relative Humidity: 10% to 95%, Non-Condensing
- Ingress of Water: Type 3RX, IP55
Mechanical Specifications
- Size: See images on listing.
- Weight: 90 kVA = 1,227 lbs (557 kg)
- Enclosure: NEMA 3RX corrosion-resistant
- Cooling: Forced convection
Standards
- EN 61000-6-2,4*: Electromagnetic compatibility Immunity & Emission standards for industrial environments
- 2006/95/EC *: Low Voltage Directive
- ISO 1540: Characteristics of aircraft electrical system
- ISO 6858: Aircraft ground support electrical supplies
- SAE ARP 5015: Ground equipment 400Hz ground power performance requirement
- MIL-STD-704F: Aircraft electric power characteristics
- MIL-STD-1472: Human Engineering Design Criteria
- DFS-400: Specification for 400Hz aircraft power supply
*Defined Basis of CE Mark Certification
| Alternate Models | |
|---|---|
| UFC-90M-UDC420 | Alternative Model Number |
| UFC-90M-UDC620 | Alternative Model Number |
| General Information | |
|---|---|
| Part # | UFC-90M-28VDC |
| Manufacturer | Unitron |
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QUESTIONS & ANSWERS
The Unitron UFC-90M-28VDC is designed to support a wide range of commercial, military, and business aircraft that require both 400Hz AC power and 28VDC output. Its dual-output capability makes it suitable for mixed fleets and maintenance environments where different aircraft power requirements are common. This versatility helps reduce the need for multiple ground power units on the ramp or in the hangar.
Yes, the UFC-90M-28VDC is engineered to deliver simultaneous 400Hz AC and 28V DC outputs from a single ground power unit. This allows technicians to power avionics and perform engine start operations without switching equipment. Total output remains limited to the unit’s rated capacity to ensure safe and reliable operation.
The UFC-90M-28VDC is built for indoor and outdoor operation, making it suitable for both hangar maintenance and ramp environments. Its rugged enclosure and environmental protection help it withstand temperature extremes, moisture, and debris commonly encountered during ground operations. This flexibility supports year-round use across varied operating conditions.
The integrated self-diagnostic system continuously monitors system performance and records fault data in an onboard event log. This allows technicians to quickly identify issues, reduce troubleshooting time, and minimize aircraft downtime. Diagnostic visibility also helps maintenance teams plan service more efficiently and proactively address potential problems.
The unit includes multiple safety protections, such as overload, short-circuit, over- and under-voltage protection, and emergency power-off capability. Automatic line monitoring and safety interlock options further enhance protection for both aircraft and ground personnel. These safeguards are especially important during engine start and high-load operations.
Automatic line-drop compensation helps maintain a stable output voltage by compensating for voltage loss along long cable runs. This ensures consistent power delivery even when the GPU is positioned farther from the aircraft. Stable voltage improves avionics protection and reduces the risk of power-related faults during servicing.
The UFC-90M-28VDC supports multiple communication interfaces, including USB, Ethernet, RS-232, and RS-485. These connections allow for system monitoring, data logging, and integration with maintenance networks. Network connectivity helps operators track usage, diagnostics, and service history more efficiently.
By combining AC and DC power in a single unit, the UFC-90M-28VDC can replace two separate ground power units. This reduces equipment acquisition costs, simplifies maintenance, and frees up valuable ramp space. Fewer units also mean less congestion around the aircraft during ground operations.
Yes, the unit is designed to meet or exceed multiple aviation and electrical standards, including UL certification and international power specifications. It is also manufactured in an ISO 9001:2015-certified facility, supporting consistent build quality and reliability. Compliance helps ensure acceptance across global aviation operations.
The UFC-90M-28VDC can be configured with optional input and output cable lengths, aircraft safety interlocks, and alternate mounting configurations. These options allow the unit to be tailored to specific operational needs and facility layouts. Customization helps ensure efficient deployment in both fixed and mobile ground power setups.
