_& Stolon Service&Troubleshooting Guide - Home Generator Systems
'_ Model 1938 (10kW) Troubleshooting
should be measured.
o• If there is no voltage on the input side of the breaker:
• See Checking The Rotor Winding on page 45.
Make sure the breaker is CLOSED.
•• If Input Voltage is OK at the breaker, but there is no
Output Voltage:
• Replace Circuit Breaker.
•• If voltage is present at both the input and output side of
the circuit breaker:
• Make sure the sensing wires are attached to the output
side of the circuit breaker.
• Shut the unit down by selecting OFF at the
AUTO/OFF/MANUAL switch.
• Gain access to the automatic transfer switch.
• Visually inspect the components for any sign of
electrical failure and repair/replace any obvious faults.
Engine Fails To Start: (Four Blinks [ .... ])
This is a feature of the control module assembly (CMA) that
prevents the standby unit from damaging itself by continually
attempting to start, in spite of a problem that is beyond the
CMA's ability to monitor. Whenever the unit is directed to
start (MANUAL or AUTO), the CMA delivers 12VDC from
Pin #5, Wire #56 to the starter contactor for I S seconds. It
then pauses for 15 seconds and repeats the attempt until 90
seconds of start time have accumulated.
During the 15 second starting attempt, the CMA
simultaneously delivers 12VDC from Pin #7, Wire #14 to
the hour meter and fuel solenoids(s) while monitoring Pin
#10, Wire #66 for a minimum frequency signal. This
frequency terminates the delivery of start voltage to the
starter contactor. If the minimum frequency signal has not
been sensed after 90 accumulative seconds of start time, the
CMA terminates the engine cranking cycle and triggers the
LED to flash in a set of four blinks.
This directs the service technician to examine supporting
systems that could prevent the standby system from
operating.
For example:
- No Fuel
- Fuel Solenoid Failure
- Fuel Supply Discrepancies
- Failed Starter Motor
- Failed Starter Motor Connections
- Engine Component Failures
- Clogged Engine Air Filter
- Loose Spark Plugs
- Failed and/or Damaged Wiring
- Clogged atmospheric vent.
Troubleshooting Procedure:
• Reset the fault indication LED by selecting OFF at the
AUTO/OFF/MANUAL switch for 30+ seconds.
• Select MANUAL at the AUTO/OFF/MANUAL switch and
observe system operation.
Two possible conditions will exist;
Enginecranks but fails to start: (Page 25).
Enginefails to crank: (Go to page 28).
24
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