Generac Power Systems GP Series Diagnostic Repair Manual page 36

Section 4 AC Diagnostic Tests
Be sure to allow for high starting wattage when selecting
electrical devices to connect to the generator:
Calculate watts needed to start the largest motor.
1.
Add to that figure the running watts of all other
2.
connected loads.
Test 10 – Adjust Automatic Voltage
Regulator (AVR)
NOTE: Always use the unit specific schematics and
wiring diagrams for brush orientation.
Procedure
Remove two bolts (A) connecting control panel
1.
heat shield to AVR bracket.
Remove upper bolt (B) connecting AVR bracket to
2.
frame.
Loosen the bottom bolt (C) connecting AVR
3.
bracket to frame.
B
C
Figure 4-56. Remove AVR Bracket Bolts
NOTE: Do not remove bottom bolt (C).
Tilt the AVR bracket out until the inner tab of the
4.
bracket rests against the frame.
Figure 4-57. Tilt AVR Bracket Out
Leave all wires connected to the AVR.
5.
Set DMM to measure AC voltage.
6.
See Figure 4-58. Connect DMM across a 240 VAC
7.
receptacle.
30
Figure 4-58. DMM Test Leads Connected to a 240
Verify all material is clear of the alternator before
8.
proceeding.
NOTE: Automatic Voltage Regulator must be adjusted to
nominal output voltage with the generator running at NO
LOAD.
Turn the engine switch to START.
9.
See
10.
(D).
D
A
015033
Figure 4-59. AVR Adjustment Screw
Adjusting screw clockwise will increase voltage,
11.
adjusting counterclockwise will lower voltage.
Results
If there is no change in voltage while adjusting,
1.
replace AVR and retest.
If voltage is correct, stop testing.
2.
162
015034
Figure 4-60. AVR Wire Number Locations
VAC Receptacle
Figure 4-59 for location of adjustment screw
4
0
6
Diagnostic Repair Manual
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003822
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11
015027