Operation Manual – ITW GSE 6400 Tier 3
5) Check Connections and Leads
ALWAYS
check connections and leads to a component suspected of being faulty. Generally, it is
assumed that connections and wiring have been checked first and that power has not been lost as a
result of defective wiring or connections.
6) Engine Troubleshooting
Remember that the ability of the engine to start and run properly depends upon the following:
An adequate supply of 12 VDC power reaching a good starter and control board
An adequate supply of air, compressed to a sufficiently high pressure
The injection of the correct amount of clean fuel at the proper time
7) GPU Control Monitoring
The GPU control system performs complete diagnostic testing and continuous monitoring of all critical
circuits and operating electrical values. If the control system senses a problem with one of the circuits
or if any of the electrical values exceeds its safe operating limit, the control system will shut the GPU
down, or may allow the GPU to continue operation depending on the severity of the condition.
a)
Operating Modes
1) Self-Test
Mode
When power is first applied to the control circuit, the GPU performs complete self-diagnostics
of the internal circuitry. If a fault is detected during the self-test, the Alert/Failure LED will be lit
and the first (if there are more than one) failure will be displayed on the LED display.
2) Engine
Run
Mode
When the
ENGINE
pushbutton is pressed, the blue power indicator LED and the Operating
Beacon will start flashing. The starter will engage when the engine is ready. After the engine
reaches its idle speed (1000 rpm) the GPU is ready to supply power to the aircraft. (Note that the
engine will make three 15 second attempts to start the engine. If the engine doesn’t successfully
start after the third attempt, the fault LED will be lit and an Engine Start Failure message will be
displayed.)
3) Engine Shutdown Mode
Pressing the
ENGINE
pushbutton starts the 30 second delayed shutdown period. If any
output contactors are closed, they will open before starting the countdown. The shutdown period
is required to cool the engine’s turbocharger.
4) Automatic Engine Shutdown
Automatic Shutdown mode will turn off the engine after 10 minutes when all contactors are
open or if they are closed and the total generator current is less than 5 amps. (This timer is
internal and not visible.) After 10 minutes, it puts the engine in shutdown mode. (All
contactors are opened and the generator is no longer regulating voltage.) A visible 30 second
timer is displayed and the engine will turn off when the timer expires. The Automatic Engine
Shutdown mode is changed in the Setup menu and the choices are enabled or disabled.
5) Engine
Stop
Mode
After the 30 seconds delayed shutdown period, the engine stops running.
6) System Off Mode
The power is removed from the GPU’s entire control system when the battery disconnect is
opened.
OM2254 Rev A
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