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TP-6069 6/03 73Section 8 Reconnection/Adjustments
Stabilizer Potentiometer (Pot) fine tunes the regulator
circuitry to reduce light flicker.
Voltage Adjustment Pot adjusts the generator voltage
output within the range of approximately 100 to 130
volts.
Volts/Hz Pot determines the engine speed (Hz) at
which the generator output voltage begins to drop.
Note: The volts/Hz adjustment does not apply to the
following models:
Model
4/6.5/8/8.5/9EFOZ
5/8/9/10EOZ
Note: On these models, turn the volts/Hz adjustment
pot full counterclockwise to stop and seal. No
further volts/Hz adjustments are required.
Note: For optimum results, apply full load for voltage
regulator adjustment.
Voltage Regulator Adjustment Procedure
1. With the generator set off, turn the remote
rheostat, if equipped, to the midpoint.
2. Turn the voltage, volts/Hz, and stability pots fully
counterclockwise.
3. Connect the voltmeter and frequency meter to the
AC circuit or an electrical outlet.
4. Start the generator set.
5. Rotate the voltage adjustment pot clockwise to
increase the voltage (counterclockwise to
decrease voltage) to achieve the desired output
voltage.
6. Rotate the stability pot clockwise to minimize light
flicker.
7. Readjust the voltage adjustment pot if necessary.
8. Adjust the engine speed to the desired cut-in
frequency (factory setting 57.5–58 Hz for 60 Hz
models or 47.5–48 Hz for 50 Hz models) as
measured on frequency meter. To change engine
speed adjust the governor arm. Loosen the
locknut and turn it clockwise or counterclockwise
to achieve the desired frequency. See
Figure 8-13. If asecond screwholds thegovernor
arm, loosen the locknut and back out the screw.
9. If applicable, rotate the volts/Hz adjustment pot
clockwise until the voltage level begins to drop (as
measured on the voltmeter). When set to these
specifications, the generator attempts to maintain
normal output until the engine speed drops below
the frequency set in step 8 as load is applied.
10. Readjust the engine speed to normal (63 Hz/
1890 rpm for 60 Hz or 52.5 Hz/1575 rpm for
50 Hz). Tighten the locknutwhen theadjustments
are complete. Turn the second screw, if used, to
lock the governor arm in place and tighten the
locknut.
11. Readjust the voltage adjustment pot if necessary.
12. Readjust the stability pot if necessary.
13. Use the remote rheostat,if equipped, tomake final
voltage adjustments.
14. Stop the generator set.
1-929
1 2
1. Locknut
2. Speed adjusting screw
Figure 8-13 Governor Adjustment (4EFOZ/5EOZ
shown)