OM-2245 / Operation and Maintenance Manual
ITW GSE 4400 / 400 Hz. Generator Set
March 15, 2015
Chapter 1-3
Page 14
4.1
Output Voltage:
This Setup submenu allows the output voltage to be adjusted between 80.0 VAC and 135 VAC using the
UP and DOWN navigation buttons. (Please note that the acceptable voltage range for all commercial
aircraft is 115V ±3V. This range is even tighter for some aircraft.)
Enter the Setup Menu and then scroll up or down to the Output Voltage submenu. Press the
FHQWHUƔ
button to enter the submenu, and then press the
Ɣ
button again to allow the value to be changed. Press
the up or down arrow buttons to change the selection. Press the center
Ɣ
button to record the new value.
Press the LEFT arrow button to exit the submenu and return to the submenu list.
4.2
Output 1 Compensation:
The output voltage is increased in proportion to the load current (Volt / 100 A).
1.
Apply full load to output 1.
2.
Enter the “OUTPUT 1 COMPENSATION” submenu. Press the center button to allow the value to be
adjusted.
3.
Adjust the compensation using the vertical arrow buttons until the voltage at the aircraft connector
equals the no load value. Press
FHQWHUƔEXWWRQ
to accept and record this value. Press the LEFT arrow
button to exit the submenu and return to the submenu list.
4.3
Output 2 Compensation:
The output voltage is increased in proportion to the load current (Volt / 100 A).
1.
Apply full load to output 2.
2.
Enter the “OUTPUT 2 COMPENSATION” submenu. Press the center button to allow the value to be
adjusted.
3.
Adjust the compensation using the vertical arrow buttons until the voltage at the aircraft connector
equals the no load value. Press c
HQWHUƔEXWWRQ
to accept and record this value. Press the LEFT arrow
button to exit the submenu and return to the submenu list.
4.4
400 Hz EF Interlock
The EF interlock is a personnel and equipment safety feature that is found in all commercial aircraft. This
28VDC signal will not be present until the GPU closes its output contactor and provides 400 Hz power to
the aircraft. The aircraft will evaluate the 400 Hz power and if it is within the aircrafts tolerance limits it will
then close a relay in the aircraft to provide a 28VDC signal to the “F” pin/wire in the power connector
plug/cable.
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