Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 106

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
d) Operation Monitoring
While applying power to an aircraft, the GPU continually monitors all critical circuits and operating
electrical values.
During 400 Hz AC and 28.5 VDC (if supplied) operations, the GPU continually performs Command 70
(Engine Run Mode). When a fault is detected during operation, this Command and the detected
Fault are indicated in the FAULT CODE display.
By referencing the Command and Fault Code chart, the GPU state and exact fault can be
determined. When the fault is reset and the GPU restarted, the GPU may often detect the fault again
revealing additional information. This method yields a high degree of troubleshooting accuracy.
Fault meter display example shown above: If the engine shuts down with the above fault code, 70.67,
the engine ceases operation due to high coolant temperatures in the engine. The 70 represents the
command the GPU was executing at the time of the fault and shutdown (Command 70 indicates an
Engine Run Mode command.). The 67 represents the fault code that indicates the action taken by
the control system upon faulting (Fault 67 indicates a Stop Mode fault which shuts the GPU down.).
e) Extracting Fault Code Information
In the event the GPU fault code history information is required for troubleshooting, all fault codes
stored in the control system's memory (i.e. data records) can be extracted and viewed on the Fault
Meter Display (starting with the last fault code and scrolling backward through all previous fault
codes). The following are the procedures for extracting the fault code information:
(1) Pull the EMERGENCY STOP button out.
(2) Press the LAMPS pushbutton to turn on the control box lights.
(3) Press the TEST/RESET pushbutton and hold for 2 to 3 seconds until the data record number
appears on the display (See Figure 2).
May 2, 2013
Revision 2
Command
70.67
Fault Codes
Fault Meter Display
Fault
Figure 1
Chapter 2-4
Page 6