Operation Manual – ITW GSE 7400 Battery Powered GPU
90 kVA
Setup Lock / Output Mode / Compensation
Document No. 575.410DB Page 85 of 195
7.4 Manual Compensation
This is the traditional method of cable compensation. The output voltage is increased in proportion to
the load current (voltage / 100 A). This method is used where the impact of asymmetrical cables,
unbalanced loads and varying power factors may be neglected, or the auto-calibration tool isn’t
available. Manual compensation is typically used for ground power units equipped with two outputs that
are used at the same time.
1. Apply full load to output 1.
2. Enter the Compensation Type submenu and select “MANUAL”.
3. Enter the “OUTPUT 1 COMPENSATION” submenu. Press the center button to allow the value
to be adjusted.
4. Adjust the compensation using the vertical arrow buttons until the voltage at the aircraft
connector equals the no-load value. Press the ● button to accept this value.
Note
If the unit is equipped with a second output, repeat the above steps for “OUTPUT 2” (2 x 400 Hz).
Note
For units with 28 VDC ARU, please refer to section 7.23 / 7.24 / 7.25 / 7.26 & 12.3 for further
information.
7.5 Output Mode
When the unit has 2 outputs, the “Output Mode” submenu is used to set either “Individual” or
“Simultaneous” mode of operation.
If the output mode has been set to “Individual”, the outputs can be used individually and the unit uses
Plug & Play compensation if it has been set up (See paragraph 7.3).
If the output mode has been set to “Simultaneous”, both outputs can be used at the same time. If only
1 output is used, the unit uses Plug & Play compensation. When both outputs are used at the same
time, the unit uses manual compensation.
To obtain the correct operation of the voltage compensation, it is essential that both types of
compensation (Plug & Play and Manual Compensation) have been set beforehand - and for each
output.
Note
An aircraft requires an input voltage of 115V ±3V. The unit can only compensate for a maximum
voltage drop of 14 V since the highest output voltage is limited to 129 V. When extremely long 400 Hz
distribution cables are used, it might be necessary to use parallel output cables to stay within the
required aircraft voltage. Enter the Setup menu and then scroll up or down to the Output Mode
submenu. Press the center ● button to enter the submenu and then press the ● button again to allow
the value to be changed. Press the up or down arrow buttons to change the selection. Press the center
● button to record the new value. Press the LEFT arrow button to exit the submenu and return to the
submenu list.
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