Hobart 60CU20 Operation And Maintenance Manual With Illustrated Parts List page 32

OM-2226 / Operation and Maintenance Manual
60CU20 / Series 500062 / 400 Hz. Generator Set
(2) Engine Specific PC Board [ESB] (A1)
The ESB is the primary interface between the control system and the engine's electronic control
module. The ESB is unique to the specific engine model. 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.
(3) Engine Interface PC Board [EIB] (A2)
The EIB is common between all engine models and monitors coolant temperature, oil pressure,
battery voltage, and fuel tank level monitoring. The EIB is also responsible for the monitoring the
warning switches for high coolant temperature, low oil pressure, high air restriction, and low
coolant level (optional). The warning switches signal the EIB when a fault occurs, which then the
EIB relays this information to the CTL. The CTL will issue the command to the system that fits
the fault event.
The EIB also controls the power distribution in the control system, hour meter, lights, and the
engine starter operation.
May 2, 2013
Figure 7: Engine Specific PC Board
Chapter 1-1
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