Delta VFD2A8MS21ANSAA User Manual

Chapter 12 Descriptions of Parameter SettingsMS300
427

10-32
PM FOC Sensorless Speed Estimator Bandwidth
Default: 5.00
Settings
0.00–600.00 Hz
 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.

10-34
PM Sensorless Speed Estimator Low-pass Filter Gain
Default: 1.00
Settings
0.00–655.35
 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.

10-35
AMR (Kp) Gain
Default: 1.00
Settings
0.00–3.00

10-36
AMR (Ki) Gain
Default: 0.20
Settings
0.00–3.00

10-39
Frequency Point to Switch from I/F Mode to PM Sensorless Mode
Default: 20.00
Settings
0.00–599.00 Hz
 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.)

Delta VFD2A8MS21ANSAA Specifications

General

Brand	Delta
Model	VFD2A8MS21ANSAA
Category	DC Drives
Language	English