Generac 86640 - Manual (Page 26)

Test 17- Check Voltage Regulator (Con­
tinued)
1. Sensing loss shutdown- if sensing is not availabie to the
Regulator (sensing leads 11 and 22), the Regulator will shut
down.
a. With the Regulator shut down, loss of regulated excita­
tion current to the Rotor will occur.
b. The generator’s AC output voltage will drop to a value
commensurate with Rotor residual magnetism (approxi­
mately 2-7 volts AC).
c. The red LED (light emitting diode) on the Regulator is a
sensing indicator. The light will go OUT when sensing
signals to the Regulator (wires 11 and 22) are not avail­
able. It should remain ON during operation, indicating that
sensing voltage is available.
2. Voltage limiting- maximum AC output voltage is limited to
a maximum of approximately 140-145 volts AC (llne-to-neu-
tral).
PROCEDURE:
If a zero or low AC output voltage condition exists and
you have completed all previous tests Indicated in the Trou­
bleshooting Flow Chart", you might try adjusting the Voltage
Regulator. If attempts to adjust the Regulator do not produce
positive results, replace the Regulator. Then, adjust the
Regulator and test generator operation.
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