Unitron UDC-420M 28V DC Aircraft Rectifier (GPU)

The new and reliable way to power your aircraft is the Unitron UDC-420M. It is a 28V DC rectifier with 425 amps continuous and 1600 amps max for use in the hangar or ramp environment. This unit operates on 3 phase input voltage (50 hz or 60 hz).

Highlights and Benefits

• Digital touchscreen display
• Over voltage protection
• Under voltage protection
• Voltage regulation to 28.5V DC +/- 0.5 V at all times
• Output amperage can be limited to as low as 150 amps - fully adjustable
• Line drop compensation - accounts for voltage drop in supply cable
• Only unit to meet 18" fire code regulations
• Half the weight of competitors

Standard Features

• P55
• Certified to UL 1012
• Indoor/Outdoor (Hangar/Ramp)
• Use Automatic Input Line Monitoring
• 8000 Event Log / Diagnostics
• TCP/IP/Ethernet Interface (Modbus)
• 10% Power Regulation
• Internal Communication Ports - USB, RJ45 (Ethernet), RS485 (Modbus), & RS232
• External Communication Ports - RJ45 (Ethernet) & USB
• Emergency Power "OFF" Switch
• 18-Inch Hazard Area Clearance
• Voltage and Current Monitoring
• Elapsed Time Meter Access
• Front Panel Voltage Adjust
• Front Panel Summary Fault Indicators
• Input & Output Cable handle
• Input High Voltage Transient Protection
• Output Current Limit Adjust from 150 to full rated current
• Multi Language (Romanization) Display - English, French, German, Italian, Portuguese, Russian and Spanish, Others - Specify

Input

• Voltage: 208-240V and 380-480V, +/- 10%, 3 or 4 wire plus ground (Specify manual tap position at time of order)
• Frequency: 50 - 60 Hz +/- 10%
• Phase Rotation: Any
• Protection: Over/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

Output

• Full Rated Load: 425 amps continuous
• Engine Start Capacity (10% duty cycle): Adjustable up to 1600 amps for 35 seconds or 2000 amps for 30 seconds
• Overload (10% duty cycle): 600 amps for 1 hour 1000 amps for 1 minute
• Voltage: 28 VDC, 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; AW ISO 6858 and 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, over voltage and safety disconnect
• Power Regulation: 10%

Environmental

• Acoustical Noise: 65 dBA maximum at 5 feet (1.5m)
• Temperature Range: -40 degrees C to +55 degrees C
• EMI/RFI: Compatible with aircraft systems
• Relative Humidity: 10 - 95%, Non-Condensing
• Ingress of Water: Type 3RX, IP55

Mechanical Specs

• Dimensions: See image on listing.
• Weight: 340 lbs (154kg)
• Enclosure: NEMA 3RX Corrosion Resistant
• Cooling: Forced Convection

Standards

• ISO 461-1/2 - Aircraft - Connectors for Ground Electrical Supplies
• ISO 1540 - Characteristics of aircraft electrical system
• ISO 6858 - Aircraft ground support electrical supplies
• MIL-STD-704F - Aircraft electric power characteristics
• MIL-STD-1472 - Human Engineering Design Criteria

Add-On Top Cable Rack Options Available for Longer Cable Lengths

• CR 1-12 (12" cable rack) - 180' max (option) of combined cable
• CR 1-9 (9" cable rack) - 120' max (option) of combined cable
• Cable handle (standard in unit) 120' of combined cable