Lenze E94AxPExxxx - Manual (Page 199)

Lenze · 9400 Servo PLC· Reference manual · DMS 4.0 EN · 11/2013 · TD05/06
199
6 Motor interface
6.4 Servo control (SC)
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Use of the current setpoint filters depending on the resonant frequency
[6-3] Use of the current setpoint filter depending on the resonant frequency
• Resonant frequencies ≥ f
limit_SPEED
= 70 Hz ... 110 Hz
This filter is suitable for use with resonant frequencies in the range around or above the limit
frequency of the speed controller.
• Resonant frequencies < f
limit_SPEED
Please follow the Lenze recommendation and select suitable speed profiles, S-ramp or S-rounding,
for avoiding resonances.
Setting of the current setpoint filter
Since the frequency response of the speed controlled system is only rarely known to such an extent
that the current setpoint filters can be adjusted to the controlled system in the run-up, the following
example describes an experimental procedure for setting the current setpoint filters:

Stop!
If the filter parameters are set incorrectly, the impaired closed-loop control can respond
with too large overshoots and cause the controller to become unstable, e.g. if the filter
width is set to a value more than twice as large as the filter frequency.
After setting the filter parameters, the drive behaviour during stop and quick stop (QSP,
Fail-QSP) must be checked. If impairments exist,
• the drive that is still running must either be coasted down by activating the controller
inhibit or immediately be brought to a standstill via a brake.
• the speed controller must be optimised again afterwards.
• the test procedure must be repeated.
 Normal and intended use of the current setpoint filter
 Use of the current setpoint filter is only partially suitable
 The current setpoint filter should not be used
f
grenz_DRZ
f
grenz_DRZ
1
2
f
2 1 0