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  • No : 22002
  • Release Date : 2018/08/22 16:30
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Motor retention at 0 Hz

I use the inverter with a winding motor (with no brake). When the frequency becomes 0 Hz, the motor is pulled by the dancer and rotates in the reverse direction.
To prevent this, can I limit the current at 0 Hz to provide winding torque?
If not, should I increase the minimum frequency to prevent the reverse rotation?
Category : 

Answer

The inverter does not have a function to limit the current at 0 Hz.
Although it has the DC injection brake, it is intended to improve the braking capability by applying a preset DC voltage to the motor within the specified period of time (set with Pr.10 to Pr.12). Therefore, it is not possible to generate torque just for fixing the load. Also, if you increase the torque, the current is output to a particular phase for a long time or at high voltage, and overcurrent occurs to damage the inverter in the worst case.
When the inverter is kept at the minimum frequency (just below the starting frequency), the current increases due to motor slippage to cause an overload and the overcurrent warning occurs.

In conclusion, to fix the load, it is recommended to use an external brake to lock the motor.
Product Name
Inverter, magnet motor drive
Product Category
Inverter
Series
FR-A500

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