
Operation Manual – ITW GSE 4400 Tier 4
Appendix A Active Rectifier Unit (ARU)
All ITW GSE 4400 units can be equipped with a 28 VDC
A
ctive
R
ectifier
U
nit (ARU) output.
Both 400 Hz & 28 VDC outputs can be used simultaneously. The total continuous amount of power from
the unit is calculated as the sum of 400 Hz and 28 VDC output and cannot exceed the total 400 Hz power
rating of the unit.
A.1 General
Description
A-1-1 Principle of 28 VDC ARU
The 28 VDC module is an Active Rectifier Unit which is supplied from the 400 Hz generator, where the 28
VDC output voltage is controlled regardless of the 400 Hz output voltage. The DC output current is
calculated very precisely on the basis of the 400 Hz parameters using the current transformer T20,
located on phase A at the power input.
Input Contactor (Q3):
The 400 Hz input power to the ARU is supplied and controlled via Q3. When this contactor is closed, 28.5
VDC power is supplied to the aircraft.
Power Supply (PS1):
The power to the ARU control board (A20) is isolated from the unit using a DC/DC power supply (PS1)
which is rated at 24 VDC / 1 A. This module receives its power from the PC1 interface board, terminal X42.
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