4-222
(11) Setting a low gain for the speed estimator (small proportion (P) gain and high integral
(I) time) decreases the bandwidth of the speed feedback, may improve speed feedback
interference resulting in a more stable system.
(12) The default values for the ASR can be used in most applications, no adjustment is required.
Adjusting the low-pass filter time and speed estimator gains requires a good understanding
of the overall system. If a high-speed system response in combination with stable operation is
required consider using SLV control mode.
(13) Parameter 20-15 sets the gain switch frequency at low-speed and parameter 20-16 sets the
gain switch frequency at high-speed.
(14) Operating at a speed below 20-15 will result in a larger excitation current for low-speed
operation accuracy. When the frequency reference rises above 20-16, the inverter will output
the rated excitation current at the no-load voltage (02-19).
(15) For general purpose applications parameter 20-15 should be set to a value of 5~50% of the
motor base frequency. If this value is too high, the inverter output may saturate. Parameter
20-16 should be set to a value of 4Hz or more above the value of 20-08.
(16) 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).
(17) Parameter 20-17 and 20-18 are for compensating speed feedback at low speed and high
speed.
(18) 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 4.3.115 20-17 Effect on the torque-speed curve from
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. The effect on the
torque-speed curve from 20-18 is shown as the following figure 4.3.116.
Figure 4.3.116 Effect on the torque-speed curve from 20-18
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