Characteristic values for accuracy of torque and speed

VFCPLUS
without encoder

VFCPLUS with encoder

Motor temperature sensor

Without

With

Accuracy
of the calculated
torque

 

Depends on the accuracy of the motor parameters

INFORMATION: The more accurate the motor parameters, the more accurate the torque. For greater torque accuracy, measure the motor parameters with FCB25.

Deviation with FCB25

< 5% MN

Typical deviation

< 10% MN

Maximum deviationIf n is permanently < 20% of the nominal speed.

< 15% MN

< 25% MN

< 15% MN

VFCPLUS without encoder

All control modes with encoders

Accuracy
of the calculated
speedStationary inaccuracy is the deviation between the mean value of the exact physical speed and the speed setpoint.

depends on the accuracy
of the motor parameters,
typical deviation: 0.2 × fnominal slip.

Maximum deviation:
0.007% nsetpoint, 10-4 min-1