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  • No : 22061
  • Release Date : 2018/08/22 16:30
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Frequency display deviation

I use two units of the FR-E520.
The frequency is set with an analog potentiometer to around 30 Hz, but display of the first digit is not stable with one inverter only.
What is the possible cause and is there any countermeasure?
Category : 

Answer

If you are using an external VR, influence by noise is probable.
Setting Pr.74 (Input filter time constant) to a higher value stabilizes the frequency command.
Also, if you are using General-purpose magnetic flux vector control, the inverter automatically compensates motor's slippage. Therefore, when the load changes, the output frequency can change due to change of the slip compensation value.
As the output frequency deviates in this case, change Pr.37 to monitor the rotations per minute monitor, or change to V/F control.
Product Name
Inverter, magnet motor drive
Product Category
Inverter
Series
FR-E500

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