Lenze E94AxPExxxx - Manual (Page 218)

6 Motor interface
6.5 Sensorless vector control (SLVC)
218
Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
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Adjustment at no-load operation
If an adjustment at rated operation is not possible, alternatively execute the adjustment at no-load
operation.
For the adjustment of the mutual motor inductance in no-load operation, first the motor current is
compared to the motor magnetising current at a setpoint speed of approx. 75 % of the rated speed
(without load of the motor). Afterwards the setting of the mutual motor inductance is changed step
by step until the motor current just, but stably reaches the motor magnetising current.

How to adjust the mutual motor inductance at no-load operation:
1. Select setpoint speed 0 rpm
2. Enable controller.
3. Slowly increase the setpoint speed to approx. 75 % of the rated speed and keep this value
constant.
• If the controller oscillates, check the speed controller.
4. Compare the motor current displayed in C00054 with the motor magnetising current
displayed in C00092 .
5. If motor current > motor magnetising current:
• Reduce the mutual motor inductance stepwise and indirectly via the Lh adjustment in
C02861 (based on 100 %) until the following applies:
motor current < motor magnetising current
If motor current << motor magnetising current:
• Increase the mutual motor inductance stepwise and indirectly via the Lh adjustment in
C02861 (based on 100 %) until the following just applies:
motor current < motor magnetising current
6. Slowly reduce the setpoint speed to 0 rpm again.
7. Inhibit controller.
8. Save parameter set (
C00002 = "11: Save start parameters").