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Home›Repair guides›Marathon›Underfrequency (U/Freq) Adjustment - ME-SE500

Marathon — Underfrequency (U/Freq) Adjustment - ME-SE500

Adjustments · Voltage regulator ME-SE500

From a Marathon service manual covering: 250FDR1000, 250FDR1004, 252FDR1008, 252FDR1012, 252FDR1016, 340FDR1020, 340FDR1024, 342FDR1028, 342FDR1032. Check it applies to your exact model before use.

Procedure

  1. Initially set the U/Freq adjust fully counter-clockwise.
  2. Run the generator at the desired full-load speed.
  3. Turn the U/Freq adjust slowly clockwise until the U/Freq LED lights.
  4. Turn the U/Freq adjust slowly counter-clockwise until the LED just goes out.

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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