4-192
d.ASR+/-limit (20-05, 20-06)
. ASR +/-limit is the speed control of the frequency compensation limit. Set this
frequency limit to the percentage of the maximum frequency output 01-02.
If the frequency limit is over low, the actual motor speed may not reach the
target speed.
B. ASR setting (SV/SLV/PMSV control mode)
(1) SLV mode :
. SLV mode is aimed at the high-speed and low-speed sections. The speed
controller has a high-speed gain 20-00/20-01 and a low-speed gain
20-02/20-03 respectively for tuning. The switch between the high-speed and
the low-speed will be set by 20-15 and 20-16.
. Similar to the ASR gain, the speed estimate device has a high-speed gain
20-09/20-10 and a low-speed gain 20-11/20-12. The switch between the
high-speed and the low-speed will be set by 20-15 and 20-16 too.
. The speed estimate device has a low-pass filter to reduce the speed feedback
interference. 20-13 and 20-14 are resepectively defined as the low-pass filter
time constant of the high speed and the low speed. The switch between the
high-speed and the low-speed will be set by 20-15 and 20-16 too.
. 20-17 sets the low-speed compensation gain of the speed feedback.
. 20-18 sets the high-speed compensation gain of the speed feedback.
.When the frequency referency is greater than the setting of 20-16, the
high-speed ASR/estimatedevice gain and low-pass filter time constant will be
fully provided.
When the frequency referency is less than the setting of 20-15, the high-speed
ASR/estimatedevice gain and low-pass filter time constant will be fully provided.
When the speed command drops in the range from 20-15 to 20-16, the gain the
time constant will be switched linearly and smoothly.
Figure 4.3.112 ASRgain setting of SLV mode
(2) SV and PMSV gain setting
. SV and PMSV mode is aimed at the high-speed and low-speed sections. The
speed controller has a high-speed gain 20-00/20-01 and a low-speed gain
20-02/20-03 respectively for tuning.
(3) Tune the speed control gain
. For gain tuning, the multi-function analog output (AO1 and AO2 terminal) can
be used to monitor the output frequency and motor speed (as shown in figure
4.3.112).
Full speed range gain tuning of SV and PMSV mode (20-00 - 20-03)
. Complete the parameter tuning in normal operation.
. Try to increase ASR proportional gain 1 (20-00), ASR proportional gain 2
(20-02), but be careful of the system shock.
─ 20-00, 20-02 can tune the response capacity of the speed control cycle.
─ Tuning the settings of 20-00, 20-02 can increase the system response, but it
also may cause the system shock easily. Please refer to the following figure.
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