Hobart 60CU24, Operation And Maintenance Manual With Illustrated Parts List, Page: 31 / 234

OM-2098C / Operation and Maintenance Manual
60CU24 / Series 500060C / 400 Hz. Generator Set
November 16, 2007
Revision 8 Chapter 1-1
Page 17
EF1 Bypass
EF2 Bypass (if applicable)
PC Board Software
Service Tool Connector
J54 Connector
Digital Control PC Board
Figure 10
(6) Engine Specific PC Board [ESB] (A1)
The ESB (see figure 12) is unique only to the engine model used in the GPU purchased. The
ESB is the primary interface between the control system and the engine’s electronic control
module. When the CTL senses the engine start button has been pressed it signals to the ESB,
which then communicates to the engine control module what mode of operation is required (idle
or rated speed).
The ESB controls the “
FREQUENCY ADJUST” switch that is used to enable the “ FREQUENCY
ADJUST ENABLE/DISABLE” potentiometer to test the over/under frequency fault limits of the
generator set system. The ESB also controls the “DATA REQUEST” button and diagnostic
indicator light to read the engine’s ECM diagnostic error codes.