28VDC Ground Power Units

28VDC GUP on legs
28VDC Mobile GPU

Solid State 28VDC Ground Power Units

PCTI’s 28VDC Power Supplies are designed for use on airports and airfields, where power needs to be run out to planes in the hangar and over the tarmac.  Various aircraft need these supplies to start up their engines, so they can take off and travel to their destination. Our mobile version has wheels that make them easy to maneuver around obstacles and bring to wherever the customer needs to supply power.  Our Vertical Freestanding cabinets are perfect for maintenance bays, where mobility is not the issue.  These units are designed to take the standard 480VAC 60HZ or 380VAC 50Hz and convert it to 28VDC at various amperages for standard aircraft use.

We have also created brochures on these products, for your viewing pleasure:

Following are our standard specifications for 50KW-100KW power supplies.

Contact us for options not listed here or for assistance regarding your particular application.

Service: 380V-480VAC + 10%, 3 Phase, 4 Wire
Frequency: 50/60 Hz
Efficiency: 85% at full load
Power Factor: 0.8 to unity at full load and nominal input

Service: 28VDC adjustable 90% to 110%
Voltage Regulation:    + 1%
Nominal Current: 600Amps adjustable from front panel
Current Range: 0-600A
Current Limit: adjustable from 0- to 2000A
Current Regulation: ± 1%
Power Factor: 0.8 lead to 0.8 lag.  Continuous zero lead to zero lag at full rated output without damage to the unit.
Engine Start Capacity: 600A continuous, 2000A for 30 seconds every 30 minutes for aircraft starting
Overload Capacity: 110% for 30 minutes,125% for 5 minutes, 300% for 6 seconds

  • Output Analog Voltmeter +2% Accuracy
  • Output Analog Ammeter +2% Accuracy
  • Hour Meter
  • Start/Stop Pushbutton
  • Emergency Stop Pushbutton
  • On-Off Reset Pushbuttons
  • Audible Alarm
  • Alarm Silence
  • Alarm Reset
  • Power On Indicator
  • Output Electronic Shutdown
  • Input MOV, Output MOV
  • Phase Loss (shutdown)
  • Overtemperature (shutdown)
  • Overvoltage
  • Undervoltage
  • Input Circuit Breaker
  • Output Contactor
  • Temperature Range:
    • Ambient: -40°C to 55°C
    • Storage: -40°C to 65°C
  • Altitude up to 1000 meters
  • Humidity to 98% 40°C, noncondensing
  • Enclosure: NEMA 3R, Outdoor, Suitable for hangar/ramp use
  • Mounting: mobile with pneumatic tires or vertical freestanding
  • 18” Hazard Clearance

Computer interface:
• Ethernet/IP
• Modbus TCP
• CANbus,
• IEEE 488.2 / GPIB
• RS232
• RS485
• Start/stop
• Reset
• Fault
• Inhibit
• Current adjust
• Voltage adjust
• Fault indication (UV, OV, OC, other)
Analog signals:
• 4mA - 20mA
• 0V - 5V
• 0V - 10V

  • MIL-STD-704F (Aircraft Electrical Power Characteristics)
  • ANSI
  • NEC
  • IEEE

28VDC Mobile Cart: DC28-600-430-01
28VDC Vertical Freestanding: DC28-600-460-01

• Increased performance
• One programmable chip with the functionality of conventional control components
• SCR preregulator to achieve high efficiency, low ripple, precise regulation, and low output noise
• Coarse and fine adjustments are available for both current and voltage
• Event and data logging to continuously monitor equipment operating status as well as internal control parameters

  • 30’ Input cable jacketed 3-conductor with ground, pigtailed and plug ready
  • 30' 28VDC output power cable (3 Pole 28V DC Cable Assembly with 2-4/0 cables)
  • Ethernet communication port with static IP web interface
  • Digital or HMI displays
  • Controls in a NEMA 4X enclosure
  • Output Circuit Breaker
  • Tow Bar
  • Pneumatic or rubber tires
  • Custom Paint and decals (base color, industrial gray)
  • Certification options
    • UL1012
    • CSA certification
    • CE Mark certification

• Forced air
• Direct water
• Closed loop water to water heat exchanger
• Heatpipe
• Natural convection
• Water-cooled
• Liquid-cooled
• Water system protection: low flow, temperature, resistivity, leak detection, low level