12.3 C: TUNING
574 SIEPYEUOQ2A01A AC Drive Q2A Technical Manual
■ C3-28 Adaptative Slip Control Mode
No.
(Hex.)
Name Description
Default
(Range)
C3-28
(1B5B)
Expert
Adaptative Slip Control
Mode
Sets the slip compensation function mode.
0
(0, 1)
0 : Normal
1 : Advanced
Note:
Set C3-28 = 0 for better torque precision. If the torque precision does is not better, set C3-28 = 1 and increase the value of n4-65 [HF
FlxEstim Response] or n4-66 [LF FlxEstim Response] in 0.1-unit increments. Then, you must do Rotational Auto-Tuning.
◆ C4: TORQUE COMPENSATION
Torque compensation is a function that increases voltage to increase output torque as compensation for
insufficient torque production at start-up or low-speed operation.
Voltage drops due to motor winding resistance cause torque generating voltage to decrease, which causes
insufficient torque. If the main circuit cable connecting the drive and motor is long, this can also cause insufficient
torque due to voltage drops.
Note:
Set the motor parameters and V/f pattern properly before setting C4 parameters.
■ C4-01 Trq Comp Gain
No.
(Hex.)
Name Description
Default
(Range)
C4-01
(0215)
RUN
Trq Comp Gain
Sets the gain for the torque compensation function. Use this parameter value for motor 1 when
operating multiple motors.
Determined by A1-02
(0.00 - 2.50)
In V/f Control or CL-V/f Control, adjust the value in 0.05 unit increments for these conditions:
• When torque is not sufficient during low-speed operation of 10 Hz or less, increase the setting value
• When there is vibration in the motor or when the motor hunts when operating the drive with a light load,
decrease the setting value
• When you use a long motor cable, increase the setting value.
Note:
• Adjust C4-01 to make sure that the output current is not more than the drive rated current during low-speed operation.
• In usual conditions, do not change this parameter in Open Loop Vector Control. It can have a negative effect on torque precision.
• In usual conditions, do not change this parameter in PM Open Loop Vector Control. Setting this value too high can cause
overcompensation and motor oscillation.
■ C4-02 Trq Comp Delay Time
No.
(Hex.)
Name Description
Default
(Range)
C4-02
(0216)
RUN
Trq Comp Delay Time
Sets the torque compensation delay time. Usually it is not necessary to change this setting.
Determined by A1-02
(0 - 60000 ms)
It can be necessary to adjust this parameter in these conditions:
• If there is vibration in the motor, increase the setting.
• If the motor speed or motor torque response is too slow, decrease the setting.
■ C4-03 Trq Comp@FWD Start
No.
(Hex.)
Name Description
Default
(Range)
C4-03
(0217)
Trq Comp@FWD Start
Sets the amount of torque reference for forward start as a percentage of the motor rated torque.
0.0%
(0.0 - 200.0%)
The drive uses the time constant set in C4-05 [Trq Comp Time] to apply compensation.
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