Generac Power Systems CorePower 6/7 kW 60 Hz Diagnostic Repair Manual page 41

AC GENERATORS
Figure 29.
3. Set Governor Arm and Shaft by rotating the arm in the
direction shown to the wide open throttle position. Rotate the
Shaft counter-clockwise until it stops. (See Figure 30)
Figure 30.
4. Tighten Pinch Bolt Nut to 62 in-lbs (7 Nm).
5. Set the Governor Adjustment Screw to be perpendicular to
Governor Pivot Arm. This will set the initial speed close to
the operating speed. (See Figure 31)
6. Connect a frequency meter across the AC output leads
(MLCB).
7. Start the generator; let it stabilize and warm up at no-load.
8. Adjust speed by turning the Governor Adjustment Screw. If
the speed is too high, rotate the screw counterclockwise.
If the speed is too low, rotate the screw clockwise. (See
Figure 31)
Note: The no-load speed for 60 Hz is 3750 RPM (62.5 Hz); 50
Hz is 3120 RPM (52 Hz).
PART 2
Figure 31.
TEST 14 – ADJUST VOLTAGE REGULATOR
Procedure
1. On CorePower units, remove two screws holding down the
voltage regulator (AVR). PowerPact and CorePower proceed
to Step 2.
2. Leave the C1 connector and the brush connections
connected.
3. Set VOM (Volt-Ohm-Meter) to measure AC voltage.
4. Connect meter test leads across the main breaker.
240
Figure 32. VOM Test Leads Connected to the main
breaker.
6. Ensure all material is clear of the alternator before
proceeding.
7. Set the controller to the MANUAL mode.
8. Refer to Figure 33 for location of adjustment screw.
Section 2.4
Diagnostic Tests
Page 39