Generator Under Voltage – Why?

Generator under voltage can happen suddenly and without warning.

Immediately check the following to isolate the root cause:-

  • Check all voltage sensing fuses to ensure none of them have blown.

Take each fuse out , check visually for issues, clean and replace

  • Ensure the AVR is fully functional, replace if necessary.

AVR control voltages so this is the major reason for voltage issues. This requires a generator engineer and a lap top to plug into the system – Call your dealer.

  • Check alternator diodes and meggar alternator winding to highlight any issues.

Check for rust, damage, cable breaks or copper showing. Meggar Test. The above tests should highlight the cause and therefore the solution to fix.

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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