Generator Under Voltage – Why?

Generator under voltage can happen suddenly, without warning.

Immediately check the following to isolate the root cause:

  • First, check all voltage-sensing fuses to ensure that none of them have blown. Take out each fuse, visually check for issues, clean and replace.
  • Ensure that the AVR (Automatic Voltage Regulator) is fully functional likewise, replace if necessary.

The AVR controls voltages, so this is often the major reason for generator under voltage issues. This requires a generator engineer and a laptop to plug into the system – call your dealer.

  • Check alternator diodes and Megger test the alternator windings to highlight any issues.

Finally, check for rust, damage, cable breaks or copper showing. Megger test.

The above tests should highlight the cause and therefore enable you to fix the problem.

Also, read the following helpful advice on Power Continuity Knowledge Resource:

https://powercontinuity.co.uk/knowledge-base/generator-frequency-fluctuation/

https://powercontinuity.co.uk/knowledge-base/generator-hunting-and-surging/

https://powercontinuity.co.uk/knowledge-base/generator-avr-what-is-the-avr/

Call Power Continuity on 0845 055 8455
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