TRU-28 28V Transformer Rectifier Unit
delivery time
upon request
The TRU–28 transformer rectifier unit will start and power all known 28V DC aircraft. Environmentally clean and easy to use, the unit offers users significant operating benefits. Designed in collaboration with Powervamp and built to the highest industry standards (MILSTD 704, ISO 6858), it produces the highest quality output signal with minimal AC ripple and is guaranteed to be accepted by all DC aircraft. The 12 pulse rectification technology used ensures a low input total harmonic distortion at nominal loads, adding to the efficiency of the system. The TRU–28 produces a regulated 28V DC output and can deliver a constant current of 600A with engine starting peaks of up to 2400A. The current limiting feature enables the user to limit the output current to the aircraft and can be accessed and set via the digital display. The user can access the line drop compensation feature via the display menu to increase/decrease the output voltage at the plug within the limits of ISO 6858. The TRU–28 is a compact solid state module built to IP55 protection, designed for internal/external fixed or mobile use. With its weather-resistant, stainless steel case with large caster wheels, the unit can be easily moved by hand over uneven surfaces. Power consumption is reduced by the unique ‘wake/sleep’ feature which powers down the TRU–28 after sensing that there has been no current draw for a pre-set time.
Input
Voltage: 208-230-240-380-440-460- 480V AC three-phase (field adjustable)
Frequency: 50/60Hz
Rectification: 12 pulse
Power factor: > 0.80 @ nominal load
Line current: 26A – 62A @ nominal load (voltage dependent)
Output
Voltage: 28 V DC
Curren:t 600 amps continuous
Engine start capacity: 2400 A selectable
Ripple: Less than 1% at full load
Line drop compensation: Up to 15%
Overload Ratings
2400 A: 2 seconds
2100 A: 10 seconds
1800 A: 30 seconds
1200 A: 40 seconds
Efficiency
Overall efficiency: Typically > 0.92 % @ nominal load
Stand by losses: 250 W (Electronics)
No load losses: 500 W (Output on)
Environmental
Acoustic noise: 59 dB (A) @ 1 m
Temperature range: -40°C to +50°C (-40°F to +122°F)
Water ingress: IP55
Protections
Over/under voltage at the output
Over/under voltage at the Input
Reverse current at the output
Reverse polarity at the output
Phase sequence at the input
Over temperature
Internal PSU voltage monitoring
Short circuit at the output
Over/under voltage trip in the case that
U<20 VDC for more than 4 seconds
U>32 VDC for more than 4 seconds
U<40 VDC for more than 1 second
Standards
ISO 6858: Aircraft ground support electrical supplies
MIL-704E: Aircraft electric power characteristics
BS 2G 219: General requirements for ground support equipment
EN 62040-1-1 LVD: Safety standards
EN 61558-2-6 LVD: Safety standards
EN 61000-6-2 EMC: Immunity standard
EN 61000-6-4 EMC: Emission standards
BS 2G 219: General requirements for ground support equipment