4-225
ASR Setting (SLV/PMSLV control mode)
In SLV mode the ASR gain is divided into a high-speed and low-speed section. The speed controller has a
high-speed gain 20-00/20-01 and a low-speed gain 20-02/20-03 that can be set independently.
a) The high/low switch frequency can be set with parameter 20-15 and 20-16. Similar to the ASR gain, the
speed estimator has a high-speed gain 20-09/20-10 and a low-speed gain 20-11/20-12.
b) The speed estimator has a low-pass filter to reduce the speed feedback interference, parameter 20-13
and 20-14 are active at high speed as well as low speed. The switch between the high-speed and the
low-speed is set by parameter 20-15 and 20-16.
c) 20-17 sets the low-speed compensation gain of the speed feedback.
d) 20-18 sets the high-speed compensation gain of the speed feedback.
e) When the frequency reference rises above the value set in 20-16, the ASR gain used is set by
parameters 20-00 and 20-01.
f) When the frequency reference falls below the value set in 20-15, the ASR gain used is set by parameters
20-02 and 20-03.
g) Gain time constant is adjusted linearly when the speed command falls within the range of 20-15 to 20-16,
for a smooth operation.
P,I
P,I
20-15
20-15
20-15
20-16
20-16
20-16
P = 20-00
I = 20-01
P = 20-00
I = 20-01
P = 20-02
I = 20-03
Frequency
Reference
20-13
20-14
Time
Constant
Frequency
Reference
Figure 4.3.112 ASR gain setting (SLV mode)
Tuning the speed control gain
During ASR gain tuning, the multi-function analog output (AO1 terminal) can be used to monitor the output
frequency and motor speed (as shown in figure 4.3.112).
