Parameter Details
12
12.4 C: Tuning
YASKAWA SIEPC71061705H GA700 Series Technical Manual 703
■ C4-03: Torque Compensation @ FWD Start
No.
(Hex.)
Name Description
Default
(Range)
C4-03
(0217)
Torque Compensation @
FWD Start
Set the amount of torque reference for forward start as a percentage of the motor rated torque.
0.0%
(0.0 - 200.0%)
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.
■ C4-04: Torque Compensation @ REV Start
No.
(Hex.)
Name Description
Default
(Range)
C4-04
(0218)
Torque Compensation @
REV Start
Sets the amount of torque reference for reverse start as a percentage of the motor rated torque.
0.0%
(-200.0 - 0.0%)
The drive uses the time constant set in C4-05 [Torque Compensation Time] to do the torque compensation
function.
This is available only when you start the motor with the reverse Run command.
■ C4-05: Torque Compensation Time
No.
(Hex.)
Name Description
Default
(Range)
C4-05
(0219)
Torque Compensation Time
Sets the starting torque constant to use with C4-03 and C4-04 [Torque Compensation @ FWD/
REV Start].
10 ms
(0 - 200 ms)
■ C4-06: Motor 2 Torque Comp Delay Time
No.
(Hex.)
Name Description
Default
(Range)
C4-06
(021A)
Motor 2 Torque Comp
Delay Time
Sets the value if ov [Overvoltage] occurs with sudden changes in the load, at the end of
acceleration, or at the start of deceleration.
150 ms
(0 - 10000 ms)
Sets the time constant used during Speed Search or during regenerative operation when ov occurs.
Adjust this parameter in the following circumstances.
• Gradually reduce the setting in 10 ms increments and check the performance to improve motor torque speed
response when ov occurs.
Note:
• Ensure that C4-06 ≥ C4-02 [Torque Compensation Delay Time].
• Increase the setting value of n2-03 [Automatic Freq Regulator Time 2] proportional to C4-06.
■ C4-07: Motor 2 Torque Compensation Gain
No.
(Hex.)
Name Description
Default
(Range)
C4-07
(0341)
RUN
Motor 2 Torque
Compensation Gain
Sets the gain for motor 2 torque compensation function when using the Motor Switch function.
1.00
(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.
Note:
• Adjust C4-07 and make sure that the output current is not more than the drive rated current during low-speed operation.
• When A1-02 = 2 [Open Loop Vector], usually it is not necessary to change this setting. If you change this parameter in that control
method, it can decrease the torque precision.
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