Parameter Details
12
12.3 C: TUNING
SIEPYEUOQ2A01A AC Drive Q2A Technical Manual 575
When you start the motor with a forward Run command, enable this parameter. Set this parameter to 0.0 to disable
this function.
■ C4-04 Trq Comp@REV Start
No.
(Hex.)
Name Description
Default
(Range)
C4-04
(0218)
Trq Comp@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 [Trq Comp Time] to apply compensation.
When you start the motor with a reverse Run command, enable this parameter. Set this parameter to 0.0 to disable
this function.
■ C4-05 Trq Comp Time
No.
(Hex.)
Name Description
Default
(Range)
C4-05
(0219)
Trq Comp Time
Sets the starting torque constant to use with C4-03 and C4-04 [Trq Comp@FWD Start and Trq
Comp@REV Start].
10 ms
(0 - 200 ms)
■ C4-06 M2 Trq Comp Delay Time
No.
(Hex.)
Name Description
Default
(Range)
C4-06
(021A)
M2 Trq 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 [Trq Comp Delay Time].
• Increase the setting value of n2-03 [AFR Time 2] proportional to C4-06.
■ C4-07 M2 Trq Comp Gain
No.
(Hex.)
Name Description
Default
(Range)
C4-07
(0341)
RUN
M2 Trq Comp 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)
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