Engine governor adjustment (continued) – Generac 86640 User Manual
Page 76
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Engine Governor Adjustment (Continued)
a. Check the AC frequency reading under load.
b. If frequency drops below about 58 Hertz (60 Hertz units)
or 49 Hertz (50 Hertz units) under load, adjust the DROOP
ADJUSTMENT downward until application of the load
results in the smallest possible AC frequency droop when
maximum load is applied.
NOTE: If surging occurs when electrical load Is removed,
adjust the NO-LOAD BUMPER SCREW Inward. If
BUMPER SCREW adjustment changes the AC frequency
reading, back the NO-LOAD BUMPER SCREW out until
no-load frequency returns to 62 Hertz (60 Hertz units); or
to 51 Hertz (50 Hertz units).
NOTE: With unit running at correct AC frequency, you
may wish to check the generator’s AC output voltage. If
frequency reading Is correct, but voltage reading Is In
correct, adjustment of the AC voltage regulator may be
required.
Figure 3. Governor Adjustment Points
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