C4: Torque Compensation - YASKAWA CIPR-GA50C series Technical Manual

12.4 C: Tuning
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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.
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C4-01: Torque Compensation Gain
No.
Name
(Hex.)
C4-01 Torque Compensation Gain
(0215)
RUN
For these control methods and states, adjust the setting value.
A1-02 [Control Method Selection]
0 [V/f Control]
8 [EZ Vector Control]
Note:
• Adjust C4-01 to make sure that output current is not more than the drive rated current while the drive operates at low speed.
• When A1-02 = 2 [Open Loop Vector], do not change this parameter under normal conditions. Torque accuracy will decrease.
• When A1-02 = 5 [PM Open Loop Vector], do not change this parameter under normal conditions. Setting this value too high can cause
overcompensation and motor oscillation.
• When A1-02 = 8 [EZ Vector Control], you cannot change this parameter during drive run.
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C4-02: Torque Compensation Delay Time
No.
Name
(Hex.)
C4-02 Torque Compensation
Delay Time
(0216)
RUN
Note:
If A1-02 = 8 [Control Method Selection = EZOLV], you cannot change the setting while the drive is running.
Set 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.
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C4-03: Torque Compensation @ FWD Start
No.
Name
(Hex.)
C4-03 Torque Compensation @
FWD Start
(0217)
The torque compensation function is performed using the time constant set in C4-05 [Torque Compensation
Time].
This is available only when you start the motor with the forward command. Set this parameter to 0.0 to disable
this function.
530
V/f OLV OLV/PM OLV/PM AOLV/PM EZOLV
Sets the gain for the torque compensation function. Use this parameter value for motor 1 when
operating multiple motors.
Status
Torque is not sufficient during low-speed operation of 10 Hz or less.
There is vibration in the motor or the motor hunts when operating the
drive with a light load.
The cable length between the drive and motor is too long.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Sets the torque compensation delay time. Usually it is not necessary to change this setting.
V/f OLV OLV/PM AOLV/PM EZOLV OLV/PM
Set the amount of torque reference for forward start as a percentage of the motor rated torque.
Description
Increase the setting in 0.05-unit increments.
Decrease the setting in 0.05-unit decrements.
Increase the setting in 0.05-unit increments.
Description
Description
YASKAWA SIEPC71061753A GA500 Technical Manual
Default
(Range)
Determined by A1-02
(0.00 - 2.50)
Adjustment
Default
(Range)
Determined by A1-02
(0 - 60000 ms)
Default
(Range)
0.0%
(0.0 - 200.0%)