Delta C2000 Series User Manual page 531

Chapter 12 Description of Parameter SettingsC2000
 1: When the AVR function is disabled, the drive calculates the output voltage according to the
actual DC BUS voltage. The DC BUS voltage changes the output voltage, and may cause
insufficient or over-current or shock.
 2: the drive disables the AVR function when decelerating to stop, and may accelerate to brake.
 When the motor ramps to stop, the deceleration time is shorter when setting this parameter to 2
with auto-acceleration and deceleration, and the deceleration is quicker and more stable.
 When the control mode is set as FOCPG or TQCPG, it is recommended to set this parameter to 0
(enable AVR).
Torque Command Filter Time (V/F and SVC Control Mode)

Settings
 When the setting is too long, the control is stable but the control response is delayed. When the
setting is too short, the response is quick but the control may be unstable. Adjust the setting
according to the stability of the control and response times.
Slip Compensation Filter Time (V/F and SVC Control Mode)

Settings
 Change the compensation response time with Pr.07-24 and Pr.07-25.
 If you set Pr.07-24 and Pr.07-25 to 10 seconds, the compensation response time is the slowest;
however, the system may be unstable if you set the time too short.
Torque Compensation Gain (V/F and SVC control mode)

Settings
 Only applicable in IMVF and PMSVC control mode.
 With a large motor load, a part of drive output voltage is absorbed by the stator winding resistor;
therefore, the air gap magnetic field is insufficient. This causes insufficient voltage at motor
induction and results in excessive output current but insufficient output torque. Auto-torque
compensation can automatically adjust the output voltage according to the load and keep the air
gap magnetic fields stable to get the optimal operation
 In the V/F control, the voltage decreases in direct proportion with decreasing frequency. It
reduces the torque decrease at low speed due to the AC impedance while the DC resistor is
unchanged. The auto-torque compensation function increases the output voltage at low
frequency to get a higher starting torque.
 When the compensation gain is set too large, it may cause motor over-flux and result in a too
large output current, overheating the motor or triggering the protection function.
 This parameter affects the output current when the drive runs. But the effect is smaller at the
low-speed area.
 Set this parameter higher when the no-load current is too large, but the motor may vibrate if the
setting is too high. If the motor vibrates when operating, reduce the setting.
0.001–10.000 sec.
0.001–10.000 sec.
IM: 0–10 (when Pr. 05-33 = 0)
PM: 0–5000 (when Pr. 05-33 = 1 or 2)
12.1-07-13
Default: 0.500
Default: 0.100
Default: 0