Operation Manual – ITW GSE 6400 Tier 3
1) 28V
Voltage
This Setup submenu allows the 28-volt output voltage to be adjusted between 19.0 VDC and 33.0 VDC
using the UP and DOWN navigation buttons. (Please note that the acceptable voltage range for all
commercial DC powered aircraft is 26V to 29V.
Enter the Setup Menu and scroll up or down to the 28V Voltage submenu. Press the center
●
button to
enter the submenu, and 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.
2) 28V
Compensation
DC voltage drops quickly as the current increases over a given length of cable. This Setup submenu allows
the 28-volt output to be automatically adjusted as the load increases. The allowed setting is between 0.0
and 3.0 VDC per 600 amps. Note that the maximum output voltage of the unit is 33 VDC.
Enter the Setup Menu and then scroll up or down to the 28V Compensation 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.
3) Current Limit Step Size
If too much current is supplied to an aircraft engine, it is possible for the engine to shear the propeller shaft.
The Current Limit should be set to the maximum current the aircraft to be powered can take (per the aircraft
manufacturers recommendations). The Current Limit is set using the UP and Down arrows on the Operators
Panel. This submenu is used to set the step size the current limit is changed by every time the UP or Down
button is pressed. The current limit settings are from 300 amps to 2000 amps in steps of 50/100/200/300
amps. This menu selects the size of the steps that the operator uses to adjust the current limit before
turning on the 28 VDC to the aircraft.
Enter the Setup Menu and then scroll up or down to the Current Limit Step Size 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.
4) 28V Interlock
a) The 28V interlock is a personnel and equipment safety feature. This 28VDC signal will not be
present until the GPU closes its output contactor and provides power to the aircraft connector. The
connector typically has a split “C” socket with +28VDC on one side and a jumper to the return wire
on the other side of the socket. The GPU will not keep the output contactor closed if this voltage is
not detected on the return wire in the cable. (This option requires a special cable such as the
JB2840-30CS, JB2840-40CS or JB2840-50CS.)
Note! The value will be automatically reset to Active if the unit detects 28 volts on the "F" pin input of
the I/O board.
b) Go into the Setup Menu and then scroll up or down to the 28V Interlock 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.
OM2254 Rev A
Page 43 of 103
