Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 53

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
WARNING
NEVER disconnect the output cable while power is being delivered. Output
contactors must be open prior to removal of the cable from the aircraft.
CAUTION
The generator set must be shut down so that the failed power delivery problems can
be diagnosed. Only licensed technicians should work on this generator set.
e) Failed Power Delivery
If the contactor indicating light goes out approximately two seconds after the output pushbutton switch
is released, and the fault code meter shows an EF1 or EF2 fault code, this indicates that the aircraft is
not supplying the 28.5 VDC interlock signal to the plug interlock circuit. Correct the condition and
again press the output pushbutton switch.
The "REGULATED/DIAGNOSTIC" switch (located on the voltage regulator PC board) must be set to
"NORMAL" for power delivery.
If the aircraft (or load bank) does not have the 28.5 VDC signal, set the EF Bypass ON/OFF switch
(located on the digital control PC board) to the "ON" position.
See "Load Contactor Operating Circuits" in Section 2-4 for other for additional troubleshooting
procedures.
f) Discontinue Power Delivery with Unit Shutdown
(1) Normal conditions
a Push the "OUTPUT" (No. 1 or No. 2) pushbutton switch to open the output load contactor.
The indicating light (yellow or orange depending on the contactor used) on that switch will go
OFF immediately to indicate that the load contactor has opened and power is no longer being
delivered to the aircraft. The engine will remain at rated speed.
b Push the red "ENGINE STOP" pushbutton switch once to bring the engine down to idle
speed. This will begin the automatic shutdown sequence to shut off the engine, gauges,
lights, etc., after approximately 3 - 5 minutes.
c Disconnect output cable from aircraft after engine is at idle speed only.
(2) Emergency conditions
a Depress the "EMERGENCY STOP BUTTON" located on the control box door to the right of
the control panel. When pushed this button instantly shuts the generator set off. Pull the
button back out to reset it before restarting the generator set.
CAUTION
Do not use the "EMERGENCY STOP BUTTON" button as a normal shutdown device.
Damage to the engine turbo charger may result without proper cooling time. Use the
"ENGINE STOP" push-button for all normal engine shutdowns.
May 2, 2013 Chapter 1-3
Page 5