Hobart 120CU20, Operation And Maintenance Manual With Illustrated Parts List

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OM-2228 / Operation and Maintenance Manual
120CU20 / Series 500120 / 400 Hz. Generator Set
October 15, 2013 Chapter 2-4
Page 4
(3) Engine Idle Mode
When the engine has been started, the engine will begin in the idle mode. The “ENGINE
START” push-button will flash indicating the engine is in the idle mode.
(4) Engine Run Mode
After the engine has been warmed up properly in the Engine Idle Mode, pressing the “ENGINE
START” push-button again brings the GPU up to rated speed. The “ENGINE START” push-
button light no longer flashes, but instead becomes continuously illuminated. The GPU is now
ready for aircraft loading.
(5) Engine Shutdown Mode
When shutting the GPU down, pressing the “ENGINE STOP” push-button starts the 3-5 minutes
delayed shutdown period. The “ENGINE STOP” push-button flashes and the engine returns to
idle speed. The shutdown period is required to cool the engine’s turbocharger.
(6) Engine Stop Mode
After the 3-5 minutes delayed shutdown period, the engine stops running.
(7) System Off Mode
The power is removed from the GPU’s entire control system.
b) Faults
Faults result when any of the fault limits are exceeded, when an internal problem occurs, or under
certain conditions that would cause injury to personnel or damage to an aircraft or the GPU. Faults
are also stored in memory as event records. The fault limits and conditions are preset at the factory.
Faults
.01
\
.09
Warning (no operation changes)
.10
\
.39
Run Mode (minor fault)
.40
\
.59
Idle Mode (moderate fault)
.60
\
.79
Stop Mode (major fault)
.80
\
.99
Special Configuration (reserved)
Table 2 Fault Codes