Operating Instructions

Descriptions of Parameter Settings
Descriptions of Parameter Settings
233 | 443
Pr.
Explanation
Settings
Default
10-32
PM FOC sensorless speed
estimator bandwidth
0.00 to 600.00 Hz
5.00
● Sets the speed estimator bandwidth. Adjust the parameter to influence the stability and the accuracy of the
motor speed.
● If there is low frequency vibration (the waveform is similar to a sine wave) during the process, then increase the
bandwidth. If there is high frequency vibration (the waveform shows extreme vibration and is like a spur), then
decrease the bandwidth.
Pr.
Explanation
Settings
Default
10-34
PM sensorless speed estimator
low-pass filter gain
0.00 to 655.35
1.00
● Influences the response speed of the speed estimator.
● If there is low frequency vibration (the waveform is similar to a sine wave) during the process, then increase the
gain. If there is high frequency vibration (the waveform shows extreme vibration and is like a spur), then
decrease the gain.
Pr.
Explanation
Settings
Default
10-35
AMR (Kp) gain
0.00 to 3.00
1.00
10-36
AMR (Ki) gain
0.00 to 3.00
0.20
10-39
Frequency point to switch from I/F
mode to PM sensorless mode
0.00 to 599.00 Hz
20.00
● Sets the frequency for the switch point from low frequency to high frequency.
● Due to the weak back-EMF in the low frequency area, PM sensorless mode cannot estimate the accurate
speed and position of the rotor. Thus, using I/F mode control is more suitable. In the medium-to-high frequency
area, PM sensorless can accurately estimate the back-EMF, stabilizes and controls the motor with lower
current.
● If the switch point is too low and PM sensorless mode operates at a too low frequency, the motor does not
generate enough back-EMF to let the speed estimator measure the right position and speed of the rotor, and
causes stall and oc when running at the switch point frequency.
● If the switch point is too high, the drive easily runs in the frequency area of the I/F mode for a long time, which
generates a larger current and cannot save energy. (If the current for Pr.10-31 is too high, the high switch point
makes the drive continue to output with the setting value for Pr.10-31.)
Pr.
Explanation
Settings
Default
10-40
Frequency point to switch from
PM sensorless mode to I/F mode
0.00 to 599.00 Hz
20.00
● Sets the switch point from high frequency to low frequency.
● Due to the weak back-EMF in the low frequency area, PM sensorless mode cannot estimate the accurate
speed and position of the rotor. Thus, using I/F mode control is more suitable. In the medium-to-high frequency
area, PM sensorless can accurately estimate the back-EMF, stabilizes and controls the motor with lower
current.