Delta VFD040C43A-21 User Manual

Chapter 12 Descriptions of Parameter SettingsC2000 Plus
12.1-10-11

10-31
I/F Mode, Current Command
Default: 40
Settings 0–150% rated current of the motor
 Set 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.
 When Pr.00-11 = 8 (SynRM sensorless), the setting value becomes 15%, and the application
extends to high-speed and flux-weakening regions.
 When Pr.00-11 = 8 (SynRM sensorless) and the motor drive operates in flux-weakening region,
you can adjust the parameter if the rotation speed is restricted and cannot increase, causing the
controller to lose control.

10-32
PM FOC Sensorless Speed Estimator Bandwidth (High Speed)
Default: 5.00
Settings 0.00–600.00 Hz
 Set 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 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.

10-33
PM FOC Sensorless Speed Estimator Bandwidth (Low Speed)
Default: 1.00
Settings 0.00–600.00 Hz
 This parameter is only valid in SynRM sensorless (Pr.00-11 = 8) speed mode.
 Increase the setting value improves the loading performance during the start-up and low-speed
operation.
 When the motor starts or the rotation speed is lower than I/F switching frequency point (Pr.10-
39), you can adjust the parameter if the motor speed has oscillation.
 If Pr.05-33 = 3 (SynRM), then the unit becomes Pu, and the setting range becomes to 0.01–3.00,
the default becomes to 1.00.

10-34
PM Sensorless Speed Estimator Low-pass Filter Gain
Default: 1.00
Settings 0.00–655.35
 Changing the setting affects 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 bandwidth.
 If Pr.05-33 = 3 (SynRM), then the upper limit becomes 10.00.

Delta VFD040C43A-21 Specifications

General

Brand	Delta
Model	VFD040C43A-21
Category	DC Drives
Language	English