Service&Troubleshooting Guide - Home Generator Systems __& Sf_an _
Model 1938 (I 0kW) Troubleshooting _ _'_
Check engine RPM.
• Set engine RPM to
3600. as specified in
the BRIGGS &
STRATTON engine
service manual.
Low Frequency Troubleshooting Procedure:
Verify that the Control Module Assembly (CMA) is
grounded.
• Check for continuity between Pin #13, Wire #0 and
Ground as shown in figure 27.
should be measured at the starter terminal
and ground during the period that the CMA
delivers 12VDC to the terminals of the starter
contactor.
• . If voltage is present but the starter won't engage:
• Check the engine grounding cable for good contact.
Repair or replace any defects with the grounding cable.
If no voltage is present at the starter terminal:
• Replace the starter contactor.
• . If starting voltage is present at the starter terminal:
• Refer to the BRIGGS & STRATTON Service Manual for
procedures to check the engine starter.
Low Frequency: (Five Blinks [ ..... ])
The low frequency shutdown feature is designed to protect
the generator and the devices connected to the protected
circuits from an output frequency that is too low. The CMA
senses a frequency of 60 Hz at Pin #10, Wire #66. If output
frequency drops below a minimum for more than a few
seconds, the CMA will shut down the generator and trigger
the diagnostic LED to blink in a set of five blinks.
This condition may be caused by a failed engine governor or
by excessive loads on the protected circuits of the house.
•. If no continuity is measured:
• Repair and/or replace any defective wiring or terminals.
• Retest continuity between Pin #13, Wire #0 and
Ground as shown in figure 27.
•. If continuity is measured:
• Install a jumper wire between Wire #15 at the fuse
holder and Wire #14 at the hour meter as illustrated in
figure 28.
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