1. On the circuit board, locate potentiometers R26 and R27. See Figure 1. Also, locate the
red LED.
2. Turn the COARSE (R26) pot all the way clockwise (CW).
3. Turn the FINE (R27) pot all the way counterclockwise (CCW).
4. Start the generator engine manually, using the Start/Stop switch. Let the engine stabilize
and warm up at no-load. If necessary, adjust the engine
governor to obtain normal rated operating speed.
5. With the unit running at no-load and at its normal rated speed, slowly turn the COARSE
(R26) pot counterclockwise (COW) until the red LED just turns on.
6. Slowly turn the FINE (R27) pot clockwise (CW) until the red LED just goes out.
7. Slowly, turn the FINE (R27) pot counterclockwise (CCW) until the red LED just turns on.
With the board properly calibrated, overspeed shutdown will occur at approximately 10
Hertz above the unit's normal operating frequency. For example, if the engine no-load
speed is 62 Hertz, overspeed shut-down will occur at
approximately 72 Hertz.
MORE DETAILED INSTRUCTIONS from Generac Diagnostic Repair Manual # 79247:
CAUTION: Steps 2 and 3 MUST be completed BEFORE THE ENGINE IS STARTED. If the engine is
started before the steps are completed, an over-speed shutdown may occur at normal rated operating
speed.
PRODUCT INFORMATION BULLETIN
for Control Board # 0830890SRV
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