8400 StateLine C | Reference manual
Motor control (MCTRL)
Sensorless control for synchronous motors (SLPSM)
184 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
If the mass inertia of the drive is unknown, the optimisation can be achieved as follows:
1. Specify speed setpoint.
– A small speed just above the switching threshold is recommended in the closed-loop
controlled operation.
2. Increase Vp (C00070/3
) until the drive starts to oscillate (observe engine noise).
3. Reduce Vp (C00070/3
) until the drive runs stable again.
4. Reduce Vp (C00070/3
) to approx. half the value.
5. Afterwards check results of the optimisation in the entire speed range (one-time
passing through of the speed range).
Tip!
Values recommended by Lenze for the setting of the (proportional) gain:
• For drive systems without feedback: Vp = 2 … 8
• For drive systems with a good disturbance behaviour: Vp > 6
Speed controller reset time Ti
Apart from setting the P component, C00071/3
provides the possibility to take influence
on the I component of the PI controller.
If the mass inertia of the drive is unknown, the optimisation can be achieved as follows:
1. Specify speed setpoint.
2. Reduce Ti (C00071/3
) until the drive starts to oscillate (observe engine noise).
3. Increase Ti (C00071/3
) until the drive runs stable again.
4. Increase Ti (C00071/3
) to approx. twice the value.
Tip!
Value range recommended by Lenze for the setting of the reset time:
Ti = 20 ms … 150 ms
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