Delta CFP2000 Series User Manual page 412

10 Sensorless Motor Control Parameters
I/F Mode, Current Command

Settings
 Sets the current command for the drive in low speed area (low speed area: frequency command
< Pr.10-39). When the motor stalls on heavy-duty start-up or forward / reverse with load,
increase the parameter value. If the inrush current is too high and causes oc stall, then
decrease the parameter value.
PM FOC Sensorless Speed Estimator Bandwidth

Settings
 Sets the speed estimator bandwidth. Adjust the parameter to change the stability and the
accuracy of the motor speed.
 If there is low frequency vibration (the waveform is similar to the 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.
PM Sensorless Speed Estimator Low-pass Filter Gain

Settings
 Changes the response speed of the speed estimator.
 If there is low frequency vibration (the waveform is similar to the 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.
Frequency Point to Switch from I/F Mode to PM Sensorless Mode

Settings
 Sets the frequency for the switch point from low frequency to high frequency.
 If the switch point is too low, the motor does not generate enough back-EMF to let the speed
estimator measure the rotor right position and speed, and causes stall and oc when running at
the switch point frequency.
 If the switch point is too high, the active area of I/F is too wide, which generates more current
and cannot save energy. If the current value 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.
0–150% of motor rated current
0.00–600.00 Hz
0.00–655.35
0.00–599.00 Hz
Chapter 12 Description of Parameter SettingsCFP2000
 This parameter can be set during operation.
12.1-10-1
Default: 40
Default: 5.00
Default: 1.00
Default: 20.00