Atlas Copco Incorrect Engine Speed / Frequency

Generator frequency is consistently low or high (e.g. 47–48 Hz or 52–53 Hz) at steady load

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Misadjusted governor, Sticking fuel actuator, Incorrect controller speed setting, Mechanical linkage wear

Safety first: Incorrect frequency can damage connected equipment. Avoid long‑term operation outside ±2% of nominal.

Verify with external meter: Confirm frequency with a calibrated meter, not just panel indication.
Check controller settings: Ensure rated speed/frequency parameters match the generator nameplate.
Inspect governor/actuator: Look for binding linkages or weak return springs. Lubricate or replace as needed.
Adjust governor (qualified personnel): Fine‑tune speed setting to achieve correct frequency at rated load.

Hard 4/5

Electronic Governor Actuator

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