Lenze 8400 TopLine - Manual (Page 273)

Lenze · 8400 TopLine · Reference manual · DMS 6.0 EN · 06/2014 · TD05/TD14
273
5 Motor control (MCTRL)
5.10 Parameterisable additional functions
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5.10.7.1 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 ( 190)