Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 87

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
c) Testing the No. 1 Output Circuit
(1) Place EF Bypass switch in "BYPASS / OFF" position turn the EF signal "ON" on the load bank.
Then press the yellow No. 1 load contactor push button switch to close contactor, which is
indicated when its internal indicating light glows.
(2) Place EF switch on the load bank in the off position. The No. 1 load contactor should open
immediately, and the indicating light within the push button switch should go off. The fault code
display should also read "EF 1", indicating an EF warning. This is because the interlock circuit of
the control PC board is not receiving 28.5 VDC signal from an outside source. It indicates that
the No. 1 interlock circuit is OPEN, as it should be when the interlock circuit is not receiving a 28
VDC signal. Reset the fault by pressing the "TEST/RESET" push button.
(3) Verify that when the EF Bypass switch is in the "BYPASS / ON" position or the "BYPASS / OFF"
position that the appropriate LED indication on the control panel display is correct.
(4) Place EF bypass switch in "BYPASS / ON" position. Press the No. 1 load contactor push button
switch. The No. 1 contactor power indicating light within the push button switch should glow and
remain on when the push button switch is released. This indicates that EF bypass switch is
functioning correctly. The corresponding LED should also indicate the bypass mode.
May 2, 2013
Figure 3: Digital Control PC Board
Chapter 2-3
Page 5