The Unitron UDC-420M is the new and reliable way to power your aircraft. This 28V DC rectifier produces 425 amps continuous and 1,600 amps maximum, making it ideal for use in the hangar or ramp environment. This unit operates on 3-phase input voltage (50 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 the supply cable
The only unit to meet 18" fire code regulations
Half the weight of the competitor's model
 
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 the full rated current
Multi-Language (Romanization) Display – English, French, German, Italian, Portuguese, Russian and Spanish, Others - Specify
 
Input
Voltage: 208V to 240V and 380V to 480V, +/- 10%, 3 or 4 wire plus ground (Specify manual tap position at the time of order)
Frequency: 50 to 60 Hz +/- 10%
Phase Rotation: Any
Protection: Over/under-voltage, 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 1,600 amps for 35 seconds or 2,000 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 the full rated current
Protection: Overload, short circuit, over-voltage and safety disconnect
Power Regulation: 10%
 
Environmental
Acoustical Noise: 65 dBA maximum at 5 ft. (1.5 m)
Temperature Range: -40°C to 55°C
EMI/RFI: Compatible with aircraft systems
Relative Humidity: 10% to 95%, Non-Condensing
Ingress of Water: Type 3RX, IP55
 
Mechanical Specs
Dimensions: See image on listing.
Weight: 340 lbs. (154 kg)
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