Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 33

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
(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.
May 2, 2013
Figure 8: Engine Interface PC Board
Chapter 1-1
Page 17