3-4
Copyright 2017 Cummins Inc.
ENGINE INTERFACE BOARD (A31)
The engine interface board (Figure 3-4) reads user
control inputs, monitors engine, alternator and sys-
tem status, and initiates the appropriate action for
normal operating and fault conditions (warning or
shutdown).
This board is connected to the engine sensors, bat-
tery, starter, governor output module, voltage regu-
lator output module, and the magnetic pick-up
(MPU).
The engine interface board can also be connected
to an optional network interface module for network
access.
During a typical start sequence the LED’s light as
follows:
1. DS11 lights when a remote run signal is re-
ceived and S12 is in the Auto position, or S12 is
moved to the Run position.
2. DS12 lights when the magnetic pick-up voltage
is sensed (engine is cranking). (When the en-
gine is cranking, the mag pickup output should
be a minimum of 1 volt.)
3. DS11 extinguishes, DS9 lights and DS10 is
dimly lit when the alternator is running.
Connectors
The engine interface board has seven connectors
and one terminal strip. They are:
J1 Connects to J4 on A32 Digital board.
J2 Connects to J1 on A33 Analog board.
J3 Connects to display board, front panel
switches and meters.
J4 Connects to customer connections and to en-
gine harness which includes magnetic pick-
up.
J5 Connects to engine sensors.
J6 Connects to Genset Control module (GCM).
J7 Connects to Genset Control module (GCM).
Fuses
The engine interface board has two replaceable
fuses. They are:
F1 Control B+ (5 Amps)
F3 Aux. B+ (5 Amps). (Panel lamps and run/start
contacts).
LEDs
The engine interface board has 10 LED’s that indi-
cate the following conditions:
DS1 Low Fuel Alarm input (Red)
DS2 Low Coolant Level Alarm input (Red)
DS3 Low Engine Temperature Alarm input (Red)
DS4 S12 in Run position (Green). S12 is the Run/
Off/Auto switch.
DS5 S12 in Auto position (Green)
DS6 Emergency Stop (Red)
DS7 Not configured.
DS8 Not configured.
DS9 AVR duty cycle (Green). Brighter indicates
larger duty cycle.
DS10 GOV duty cycle (Green). Brighter indicates
larger duty cycle.
DS11 Start pilot relay output (Red)
DS12 Run pilot relay output (Red)
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