PatFranz (Customer) asked a question.

April 30, 2026 at 3:16 PM
Why doesn't my GS4 Durapuls VFD output not match the speed reference?

For example, I am running a pump right now with the reference set at 54.00 Hz and the drive is reporting the actual speed as 55.99 - 56.00 Hz. I have checked the parameter called Gain (don't remember at the moment if that is the complete parameter name) and it is set to 1. Is there another parameter that affects the actual drive output? Thanks!

  • 4 answers
  • 102 views

  • ADC_Tech_03 (AutomationDirect)

    Is the reference being fed to the drive through an analog input on the drive or though a communication module?

  • PatFranz (Customer)

    reference fed via ethernet/ip

    thanks

  • ADC_Tech_03 (AutomationDirect)

    Is the drive simply accepting raw speed commands or is a PID in use?

  • PatFranz (Customer)

    Just accepting raw speed commands. It responds correctly to relative changes both up and down in speed but it always results in a higher output Hz than the speed reference entered.

    thanks.

 

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