Marathon — Stability Adjustment

Adjustments · Voltage regulator

From a Marathon service manual — check it applies to your exact model before use.

Procedure

1. Connect an analog dc voltmeter across the exciter field.
2. Operate the generator set at no load.
3. Reduce the generator voltage to 90% of the normal operating voltage.
4. Turn the stability adjustment counter-clockwise until the system is unstable.
5. Turn the stability adjustment clockwise until the system reaches the desired level of stability.
6. Readjust the voltage to its normal operating level.

Source: Marathon 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.

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