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Questions

  • No : 21527
  • Release Date : 2018/08/22 16:28
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Overcurrent at low speed

When I set Pr.96 to "1" (Offline tuning) and then issue the operation command, "8" is displayed instead of "9" (completion).
When the inverter is operated under no load, the current is 0.9 A at 60 Hz and 1.6 A at 6 Hz, resulting in overload at low speed.
(The inverter capacity is 0.75 kW and 0.4k constant-torque geared motor is used.)What is the possible cause?
Category : 

Answer

"8" display in offline auto tuning means forced stop by the operator.
This means that you stopped operation before tuning completes.  
With this forced stop, the tuning data is not stored in the inverter and the previous data is used when you start the motor.
It is considered this caused the overload at low speed.  
Since the inverter capacity is one-rank higher than the motor capacity, tuning is not necessary and you can drive the motor under normal V/F control.
Since the motor is the constant-torque motor, adjust the Pr.0 (Torque boost) setting value. (The initial setting is 6%. Reduce it so that the current does not increase.) 
Product Name
Inverter, magnet motor drive
Product Category
Inverter
Series
FR-A500
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