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Copyright 2017 Cummins Inc.
CUSTOMER INTERFACE BOARD (A34)
The customer interface board (Figure 3-7) connects
to the PT/CT board to bring in voltage and current. It
also connects to customer inputs and outputs.
Connectors
The customer interface board has five connectors.
They are:
J1 Customer connections
J2 Customer connections
J3 A36 PT/CT Board and customer connections
J4 Connects to J2 on A32 Digital board
J5 Connects to J4 on A33 Analog board
LEDs
The customer interface board has 27 LED’s that in-
dicate the following conditions:
DS1 Master First Start Input (Green) − paralleling
application only
DS2 Pre low oil pressure output relay K14 (Red)
DS3 Customer Fault #4 Input (Red)
DS4 Customer Fault #1 Input (Red)
DS5 Low oil pressure output relay K15 (Red)
DS6 Fault Reset Input (Red)
DS7 Engine Idle (Green)
DS8 Load Demand (Green) − paralleling applica-
tion only
DS9 Breaker Open/Inhibit Input (Green) − paral-
leling application only
DS10 Genset Breaker Closed Position (Green) −
paralleling application only
DS11 Customer Fault #2 input (Red)
DS12 Low coolant output relay K17 (Red)
DS13 Low Fuel Input (Red)
DS14 Remote Start input (Green)
DS15 Customer Fault #3 input (Red)
DS16 Breaker Control input relay energized from
Digital board (Green).
In single set application, this output is acti-
vated for a breaker trip when there is a shut-
down fault.
In paralleling application, this output is acti-
vated to close a breaker
DS17 Common Alarm output relay energized from
Digital board (Green)
This output is activated only on a shut-
down condition.
DS18 Spare output relay energized from Digital
board (Green)
This output is activated only on a warn-
ing condition.
DS19 Load Dump output relay energized from
Digital board (Red)
If overload or underfrequency for 5 sec-
onds, this output is activated (before shut-
down).
DS20 Ready to Load output relay energized from
Digital board (Green)
This output is activated when AC voltage
and frequency exceed 90% of nominal.
DS21 Pre high engine temperature output relay
K8 (Red)
DS22 Not in auto output relay K6 (Red)
DS23 High engine temperature output relay K9
(Red)
DS24 Overspeed output relay K10 (Red)
DS25 Overcrank output relay K11 (Red)
DS26 Low engine temperature output relay K12
(Red)
DS27 Low fuel output relay K13 (Red)
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