YASKAWA GA800 Technical Reference page 781

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C4-04: Torque Compensation @ REV Start
No.
Name
(Hex.)
C4-04 Torque Compensation @
REV Start
(0218)
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.
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C4-05: Torque Compensation Time
No.
Name
(Hex.)
C4-05 Torque Compensation Time
(0219)
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C4-06: Motor 2 Torque Comp Delay Time
No.
Name
(Hex.)
C4-06 Motor 2 Torque Comp Delay
Time
(021A)
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.
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C4-07: Motor 2 Torque Compensation Gain
No.
Name
(Hex.)
C4-07 Motor 2 Torque
Compensation Gain
(0341)
RUN
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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C4-19: Torque Ripple Suppress Min Freq
No.
Name
(Hex.)
C4-19 Torque Ripple Suppress Min
Freq
(0B8D)
Expert
YASKAWA SIEPC71061737D GA800 Drive Technical Reference
V/f CL-V/f OLV CLV AOLV
Sets the amount of torque reference for reverse start as a percentage of the motor rated torque.
V/f CL-V/f OLV CLV AOLV
Sets the starting torque constant to use with C4-03 and C4-04 [Torque Compensation @ FWD/REV
Start].
V/f CL-V/f OLV CLV AOLV
Sets the value if ov [Overvoltage] occurs with sudden changes in the load, at the end of acceleration,
or at the start of deceleration.
V/f CL-V/f OLV CLV AOLV
Sets the gain for motor 2 torque compensation function when using the Motor Switch function.
V/f CL-V/f OLV CLV AOLV
If there is slow oscillation at low speeds, adjust this setting. Usually it is not necessary to change this
setting.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
12.4 C: Tuning
Default
(Range)
0.0%
(-200.0 - 0.0%)
Default
(Range)
10 ms
(0 - 200 ms)
Default
(Range)
150 ms
(0 - 10000 ms)
Default
(Range)
1.00
(0.00 - 2.50)
Default
(Range)
0.1 Hz
(0.0 - 10.0 Hz)
12
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