Current Setpoint Filter - Siemens SINUMERIK 840C Installation Instructions Manual

12 Functional Descriptions

12.33.3 Current setpoint filter

12.33.3
Current setpoint filters (low-pass or bandstop) are used to adapt the speed controller to the
machinery to be controlled.
The amplitude of the speed controller frequency response should remain at 0 dB over the
entire fundamental frequency range.
Note
The frequency response analysis of the current controller does not include the current
setpoint filters. The effects of the filters can be detected only in the frequency response of the
speed controller.
The following measures should be taken when filters are used.
• Record reference frequency response of speed control loop
• Determine points of resonance according to:
No. of resonance points
– Individual pronounced resonance points
– Resonance bundles
Position of resonance points
– Fundamental frequency range
– Controller stability limit
– Frequency range above controller stability limit
Properties
– Distribution of resonance (dependent on traversing speed or direction)
– Mechanical resonance or excessively high controller settings
– Reflected resonance
– Amplitude and phase margins
Note
• Reduce resonance caused by excessively high controller setting by adjusting controller
parameters.
• Use filters only in the case of purely mechanical resonance. If it is possible to attribute
resonance to specific mechanical components of the machine (load vibration, coupling,
etc.), modifications to the machine construction should also be considered.
12–338
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