8400 StateLine C | Reference manual
Motor control (MCTRL)
Parameterisable additional functions
210 L Firmware ≤ 11.00 - DMS 8.0 EN - 10/2011
5.9.7.1 Oscillation damping voltage range
The oscillation damping voltage range is successfully used with
unloaded motors (no-load oscillations)
motors whose rated power deviates from the rated power of the controller.
– e.g. during operation at high switching frequency including the power derating
involved.
operation with higher-pole motors
operation with special motors
compensation of resonance in the drive
– At an output frequency of approx. 20 ... 40 Hz, some asynchronous motors can show
resonance which causes current and speed variations and thus destabilise the
running operation.
How to eliminate speed oscillations in no-load operation at speeds with 40 ... 80 %
of the rated speed:
1. Approach the area where the speed oscillations occur.
2. Reduce the speed oscillations by changing C00234
step by step (increment 1 %).
• The filter time oscillation damping (C00235
) should not be changed.
3. These can be indicators for smooth running:
• Constant motor current characteristic
• Reduction of the mechanical oscillations in the bearing seat
Parameter Info Lenze setting
Value Unit
C00234 Oscillation damping influence 5.00 %
C00235
Oscillation damping filter time 32 ms
Note!
Compensate the resonance during operation with feedback (closed loop,
feedback of n
act
) via the parameters of the slip regulator.
Parameterising the slip regulator
( 157)
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