Generac — Electronic Governor Setup
Adjustments · Electronic Governor Control (EGC) circuit board
From a Generac service manual covering: IM100G, IM80G, NP100G, NP80G. Check it applies to your exact model before use.
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Procedure
- Set the speed pot (R5) fully counterclockwise.
- Set all other potentiometers (R12, R13, R22, R26) to their mid-point.
- Set Jumper J2 to its FAST position.
- Adjust Speed Pot R5 clockwise to obtain the correct AC frequency.
- Check no-load stability; improve by adjusting R12 and R13 clockwise.
- Apply 25 percent of rated load and check stability; adjust R22 clockwise if oscillations occur.
- Restart engine and observe startup characteristics; adjust R26 clockwise to reduce startup overshoot.
- Apply rated block load; adjust R12 and R13 counterclockwise to improve recovery from block load, R26 counterclockwise to improve recovery from load dump.
Specs & values
- System should reach stability at all load points with not more than four (4) oscillations
- System should recover to within one (1) Hertz of transients
- Steady state in less than two (2) seconds for all load changes
- No-load to full-load droop should be less than 0.5 Hertz
Source: Generac service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.