TECO A510s - System Response of ASR Proportion Gain; The Response of ASR Integral Time

4-288
Figure 4.4.113 System response of ASR proportion gain
a) Reduce ASR integral time 1(20-01), ASR integral time 2 (20-02) and carefully monitor system stability.
1. A long integral time will result in poor system response.
2. If the integral time setting is too short, the system may become unstable Refer to the following figure.
While tuning ASR P and I gain the system may overshoot and an over voltage condition can occur. A braking unit
(braking resistor) can be used to avoid an over voltage condition.
1
1
2
2
t
Motor
Speed
1
: 20-01 setting is too short(oscillation occurs)
2
: 20-01 setting is too long(slow response)
Figure 4.4.114 The response of ASR integral time
SLV mode gain tuning (20-00~20-03, 20-09~20-18) and SLV2 mode gain tuning (20-15, 20-16)
Tune the low-speed ASR P and I gain 20-02 ~ 20-03, make sure the reference frequency is below the value of
parameter 20-15. P gain and integral time tuning is the same as for parameter 20-00 and 20-01 in SV mode.
Tune the high-speed ASR PI gain 20-00~20-01, make sure the reference frequency is above parameter 20-16
value. P gain and integral time tuning is the same as for parameter 20-00 and 20-01 under SV mode.
Both low-speed ASR gain and the high-speed gain can be set to the same values and only require to be adjusted
in case of system instability.
In case tuning of the ASR P and I gain 20-00~20-03 does not improve the system response, reduce the low-pass
filter time constant 20-13~20-14 to increase the bandwidth of the feedback system and re-tune the ASR gain.
 Tune low-speed low-pass filter time constant 20-14, make sure the reference frequency is below parameter
20-15 value
 Tune high-speed low-pass filter time constant 20-13 at frequency reference, make sure the reference
frequency is above parameter 20-16 value.
 Increasing the low-pass filter time constant can limit the bandwidth of the speed feedback system and may