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What are the uses of Motor choke for Altivar 71 Drive.

Motor chokes allow operation with motor cables which are longer than the standard lengths and/or limit the dv/dt at the motor terminals to: 
  • 500 V/us for 200…400 V and 380…480 V three-phase line supplies 
  • 1000 V/us for 500…690 V three-phase line supplies 
They are also used to: 
  • Limit overvoltages at the motor terminals 
  • Filter interference caused by opening of a contactor placed between the filter and the motor 
  • Reduce the motor earth leakage current 
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