8400 HighLine | Parameter setting & configuration
Motor control (MCTRL)
Parameterisable additional functions
180 L Firmware ≤ 05.00 - DMS 4.2 EN - 02/2010
5.8.5 Oscillation damping
Mechanical oscillations are undesirable effects in every process and they may have an
adverse effect on the single system components and/or the production output.
Mechanical oscillations in the form of speed oscillations are suppressed by the oscillation
damping function.
Oscillation damping 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:
1. Approach the area where the speed oscillations occur.
2. Reduce the speed oscillations by changing C00234
step by step.
3. These can be indicators for smooth running:
• Constant motor current characteristic
• Reduction of the mechanical oscillations in the bearing seat
Related topics:
L_NLim_1 FB: Blocking frequency function
( 1004)
Parameter Info Lenze setting
Value Unit
C00234 Oscillation damping influence 5.00 %
C00235
Filter time - oscillation damping 32 ms
C00236
Oscillation damping - field weakening 14
Note!
Compensate the resonance during operation with feedback (closed loop,
feedback of n
act
) via the parameters of the slip regulator only.
Parameterising the slip regulator
( 130)
efesotomasyon.com - Lenze
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