Creation:03.09 — 2009 1-1-14
Description
The following instruments and control switches are mounted on the instrument panel.
(1) Idle / Rated Speed Switch
The engine idle / rated speed switch is a three position toggle switch identical to the
output contactor switches. The lower position of the switch is for idle engine speed and
the center position of the switch is for full engine speed. Both of these positions are
maintained contacts.
The top position of the switch is a momentary contact and is used to turn on the
generator control module which then allows the generator to build up voltage. At this
point, 400 Hz power is available at the generator side of the output load contactor(s),
but no further. When the switch is released, it will automatically return to the rated
speed position.
In the OFF position, the switch opens the AC circuit to the rectifier bridge, thereby
cutting the DC power to the contactor coil. This causes the output load contactor to
open.
(2, 3) Output Contactor Switches
The output contactor switches are three position toggle switch identical to the idle/rated
speed switch. When held in the momentary CLOSE position, it provides 400 Hz power
directly to a rectifier bridge, which supplies DC power to the respective contactor coils
for closing the output contactors. When released, it returns to the normal ON position
and continues to allow power to go to the rectifier bridge, but in this switch position, AC
power must pass through the plug interlock relay contacts, K11 & K13, and the
generator control module, VR1.
(4) 28.5 VDC Contactor Switch (optional)
The 28.5 VDC contactor switch functions the same way as the 400 Hz output contactor
switches except it controls the 28.5 VDC output load contactor.
(5) Ignition Switch
The ignition switch is used to turn the GPU on and off by controlling power to the
engine’s Electronic Control Module (ECM).
(6) Emergency Stop Switch
The emergency stop switch cuts battery power to the engine ECM and the Generator
Control Module, and will shut the GPU off.
THE EMERGENCY STOP SWITCH MUST ONLY BE USED IN AN EMERGENCY
SITUATION AND NOT FOR NORMAL GPU USE.
(7) #1 Output Light
The #1 output light will illuminate whenever 400 Hz power is traveling accross the #1
output load contactor.
(8) Spare
(9) 28.5 VDC Output Light (optional)
The 28.5 VDC output light will illuminate whenever 28.5 VDC travels accross the 28.5
VDC output load contactor.
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