GENERATOR

Portable Generator Familiarization & Troubleshooting Guide
Section 3 • Generator Diagnostics and Adjustments
VOLTAGE REGULATOR ADJUSTMENTS
To adjust the regulator, proceed as follows:
Connect an (AC) voltmeter and frequency meter to panel
electrical receptacles or to the stator (AC) power winding
leads.
• Start the engine and let it stabilize and warm up at “noload.”
The “no-load” frequency should be approximately:
62 Hertz (60 Hertz units); or 51 Hertz (50 Hertz units).
If necessary:
• Adjust the engine carburetor and/or governor to obtain
the correct frequency at “no-load.”
• Slowly turn the voltage adjust pot (Figure 3.60) until
“no-load” voltage is:
115VAC (line-to-neutral) or
230VAC (line-to-line).
Figure 3.60 — Voltage Regulator
Red LED
Units rated 120/240VAC:
With engine running at its correct “no-load” speed:
• Slowly turn the voltage adjust pot (Figure 3.59) until
“no-load” voltage is:
124VAC (line-to-neutral) or
248VAC (line-to-line).
Figure 3.59 — Voltage Regulator
Voltage regulators with Gain Adjustment
If the regulator is equipped with a gain adjust pot, repeat the
previous procedure and do the following:
• Connect a 60 watt light bulb to the generator.
If the light bulb flickers:
• Adjust the “GAIN” potentiometer (Figure 3.61) until
the flicker is eliminated.
Figure 3.61 — Voltage Regulator With Gain Adjust
Gain Pot
Voltage Adjust Pot
Units rated at 110/220 VAC:
With engine running at its correct “no-load” speed:
90