4-257
4Hz or more above the value of 20-08.
When experiencing speed jitter at high speed and stable operation during mid-range speed while
operating a heavy load (>100%), it is recommended to reduce the no-load voltage (02-19) or tune the
FOC parameters (18-05 ~ 18-06).
Parameter 20-17 and 20-18 are for compensating speed feedback at low speed and high speed.
Use parameter 20-17 to adjust the torque compensation gain for the low speed range. By tuning
20-17an offset is added to the torque-speed curve. Increase 20-17 when the no-load speed is lower
than the frequency reference. Decrease 20-17 when the no-load speed is higher than the frequency
reference. The effect on the torque-speed curve from 20-17 is shown as the following figure:
Figure 4.4.99 Effect on the torque-speed curve from 20-17
Use parameter 20-18 to adjust the torque compensation gain for middle to high speed range. For most
general purpose applications it is not necessary to adjust the 20-18. By tuning 20-18an offset is added
to the torque-speed curve. Increase 20-18 when the no-load speed is lower than the frequency
reference. Decrease 20-18 when the no-load speed is higher than the frequency reference. The effect
on the torque-speed curve from 20-18 is shown as the following Fig.4.4.100.
Figure 4.4.100 Effect on the torque-speed curve from 20-17
ASR main delay time (20-08).
a) Does not required to be adjusted for general purpose applications
b) When the set value of 20-08 is set high, the speed response will and therefore system response
will decrease improving system stability.
ASR Integral Time Limit (20-04)
a) Setting a small value may prevent system response when the load suddenly changes.
Note:
- Response specificationsof no-load speed circuit bandwidth at vector control:
1. 50 Hz is at the control modes of SV / PMSV.
2. 10 Hz is at the control modes of SLV / PMSLV.
- Speed response will be affected by kp adjustment, inertia, load and motor temperature, etc. so that the
bandwidth decrease slightly in application.
20- 34
Derating of Compensation Gain
Range
【0.00~25600】
20- 35
Derating of Compensation Time
Range
【0~30000】mSec
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