•
Set the “DROOP” potentiometer (1) COUNTER CLOCKWISE to minimum 0 (zero).
•
Turn the rated speed potentiometer (5) all the way COUNTER CLOCKWISE. Then count
twelve full turns CLOCKWISE.
•
Start the engine, leave at IDLE speed and adjust the IDLE speed potentiometer in the
control box until the engine is operating at 850 RPM. Turning the potentiometer
CLOCKWISE increases engine RPM.
•
Checking No-Load Operation of Controller (See fig. 5)
•
Press engine start switch (26, Fig. 1) a second time to increase engine RPMs to
approximately the rated speed (2400 RPM).
•
Turn the “GAIN” potentiometer (4) full CLOCKWISE. The frequency meter gage and
governor should become unstable and oscillate. If it does not, manually bump the linkage
to cause it to oscillate.
•
Slowly turn the “GAIN” potentiometer (3) COUNTER CLOCKWISE until the oscillations
stop. Turn the “GAIN” potentiometer ½ an increment past a point where the oscillations
stop.
•
Turn the “D” potentiometer full CLOCKWISE. The frequency meter gage and governor
should become unstable and oscillate. If it does not, manually bump the linkage to cause it
to oscillate.
Electric Governor
Control Box
Figure 5
OM-2084 / Operation and Maintenance Manual
90CU24 / Series 500392 Generator Sets
November 27/1997
Chapter 2-3
Page 15
