Parameter Details
11
11.4 C: Tuning
YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual 761
■ 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 value.
Note:
• Adjust C4-07 to make sure that the output current is not more than the drive rated current when operating the drive with a light load.
• In usual conditions, do not change this parameter in OLV Control. It can have a negative effect on torque precision. Setting this value
too high can cause overcompensation and motor oscillation.
■ C4-19: Torque Ripple Suppress Min Freq
No.
(Hex.)
Name Description
Default
(Range)
C4-19
(0B8D)
Expert
Torque Ripple
Suppress Min Freq
Sets a frequency to limit current and torque ripple. Increase this parameter
in 1.0 Hz increments when current ripples and torque ripples occur during
low-speed operation. Set this parameter to 0.0 to disable the function if
increasing the value does not fix the problem. Usually it is not necessary to
change this setting.
0.1 Hz
(0.0 - 10.0 Hz)
Note:
Set C4-20 [Voltage Compensation Adjust 1] ≠ 0 to enable this parameter.
■ C4-20: Voltage Compensation Adjust 1
No.
(Hex.)
Name Description
Default
(Range)
C4-20
(0BCB)
Expert
Voltage
Compensation Adjust
1
Sets voltage precision compensation. Usually it is not necessary to change
this setting.
120
(0 - 200)
Note:
When there is audible noise during low-speed operation, set this parameter to 0.
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