Kohler 7.5EOR Service page 44

Voltage Regulator Adjustment Procedure:
1. Place the generator set controller start/stop switch
in the STOP position.
2. Turn the volts/Hz and the stability potentiometers
fully counterclockwise. Connect the voltmeter to
the AC circuit or an electrical outlet.
3. Start the generator set and rotate the voltage
adjustment potentiometer clockwise (increase
voltage) or counterclockwise (decrease voltage)
until the desired output voltage is achieved.
4. Rotate the stability potentiometer clockwise until
the test lamp flickers minimally.
5. Readjust the voltage adjustment potentiometer
until the desired output voltage is achieved.
6. Adjust the engine speed to the specified cut-in
frequency as measured on the frequency meter.
The factory setting is 57.5--58 Hz for 60 Hz models
and 47.5--48 Hz for 50 Hz models.
7. Rotate the volts/Hz potentiometer clockwise until
the voltage level as measured on the voltmeter
begins to drop. When the regulator is set to these
specifications, the generator set will attempt to
maintain normal output until the engine speed
drops below the frequency set in step 6 as load is
applied. See Figure 7-10.
44 Section 7 Generator Troubleshooting
125
120
115
110
105
100
40 42 44 46 48 50 52 54 56 58 60 62 64
Frequency (Hz)
60 Hz Models
50 Hz Models
Counterclockwise to increase Hz rolloff
Clockwise to decrease Hz rolloff
Figure 7-10 Volts/Hz Rolloff Chart
8. Readjust the engine speed to 1800 rpm for 60 Hz
models and 1500 rpm for 50 Hz models.
9. Readjust the voltage adjustment potentiometer
until the desired output is achieved.
10. Readjust the stability potentiometer until the lamp
flickers minimally.
11. Place the generator set controller start/stop switch
in the STOP position.
TP-6073 4/06