Chapter 4 Parameters
4-117
This parameter is only used for V/f control mode.
Related parameters: Pr.00.10(Control Method) and Pr.07.08(Torque Compensation Time
Constant).
07.03
Slip Compensation (Used without PG) (Motor 0)
Settings
0.00 to 10.00
Factory Setting: 0.00
When the induction motor generates the electromagnetic torque, it needs the necessary slip.
But the slip can be ignored when it needs only 2-3% slip in higher speed. When the drive
operates, the slip and synchronous frequency are in reverse proportion. That is, the slip will be
increased with the decreasing synchronous frequency. The slip affects the motor speed
seriously in low speed because the motor may stop and can’t run with load when the
synchronous frequency is too low.
While driving an asynchronous motor, increasing the load on the AC motor drive will cause an
increase in slip and decrease in speed.
This parameter may be used to compensate the slip by increasing the output frequency. When
the output current of the AC motor drive is bigger than the motor no-load current (Pr.07.01),
the AC drive will adjust its output frequency according to this parameter.
When Pr.00.10 is set from V/f mode to vector mode, this parameter will be set to 1.00
automatically. When Pr.00.10 is set from vector mode to V/f mode, this parameter will be set to
0.00. Please using this function after load is added and acceleration with gradual increasing
compensation. That is, add the output frequency with Pr.07.06(Motor Rated Slip (Motor 0)) X
Pr.07.03(Slip Compensation (Used without PG) (Motor 0)) on the output frequency
07.04
Motor Parameters Auto Tuning
Factory Setting: 0
Settings
0
Disable
1
Auto Tuning R1 (motor doesn’t run)
2
Auto Tuning R1 + No-load Test (with running motor)
Start Auto Tuning by pressing RUN key after this parameter is set to 1 or 2.
When setting to 1, it will only auto detect R1 value and Pr.07.01 must be input manually. When
set to 2, the AC motor drive should be unloaded and the values of Pr.07.01 and Pr.07.05 will
be set automatically.
The steps for AUTO-Tuning are:
1.
Make sure that all the parameters are set to factory settings and the motor wiring is
correct.
2.
Make sure the motor has no-load before executing auto-tuning and the shaft is not
connected to any belt or gear motor.
3.
Fill in Pr.01.01, Pr.01.02, Pr.07.00, Pr.07.04 and Pr.07.06 with correct values.
4.
After Pr.07.04 is set to 2, the AC motor drive will execute auto-tuning immediately after
receiving a ”RUN” command. (Note: The motor will run!). The total auto tune time will be
15 s Pr.01.09 + Pr.01.10. Higher power drives need longer Accel/Decel time
(factory setting is recommended). After executing Auto-tune, Pr.07.04 is set to 0.
