OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
May 2, 2013
Chapter 1-1
Page 17
Figure 8: Engine Interface PC Board
(4) Digital Control PC Board [CTL] (A3)
The digital control PC board is the center for all communications throughout the entire control
system. This board monitors the push-button switches on the control panel and issues
appropriate commands to the other PC boards in the control system. The digital control PC
board also controls the real time clock, monitors the over/under voltage and overload protection,
controls the push-button panel indicator lights, controls the generator output meters, monitors the
EF bypass switches, and communicates with the optional service tool.
EF Bypass switches (located on CTL)
The EF bypass switches,
EF1 BYPASS
for
OUTPUT 1
(or
EF2 BYPASS
for
OUTPUT 2
, if
applicable),
provide a means of bypassing the 28 VDC interlock circuit for the contactor when
supplying power to a load bank or to an aircraft not equipped with a plug interlock system.
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