C4: Torque Compensation - YASKAWA GA700 Technical Manual

11.4 C: Tuning
Slip compensation is not provided.
Depending on the load and operation status (regenerative operation), the actual motor speed may be higher or
lower than the frequency reference.
1 : Enabled (6 Hz and above)
Slip compensation is enabled during regenerative operation. It will not be active at output frequencies of 6 Hz or
less.
2 : Enabled (compensation provided wherever possible)
Slip compensation is enabled during regenerative operation. Slip compensation is enabled at frequencies as low as
2 Hz.
The drive uses the motor rated slip set to E2-02 [Motor Rated Slip] to automatically calculate the frequency range
where compensation will be disabled.
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C3-28: Adaptive Slip Contrl Mode Select
No.
Name
(Hex.)
C3-28 Adaptive Slip Contrl
Mode Select
(1B5B)
0 : Normal
1 : Advance
Note:
Set C3-28 = 0 to improve torque accuracy. If this does not make any improvements, set C3-28 = 1 and then increase the value of n4-65
[FluxEstimationResponseForHighFrq] or n4-66 [FluxEstimationResponseForLowFreq] in increments of 0.1. In this case, the
Rotational Auto-Tuning process must be executed.
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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
Adjust the value set to C4-01 in small steps of 0.05 in V/f Control or Closed Loop V/f Control in the following
situations:
• Increase the setting value when torque is insufficient during low-speed operation of 10 Hz or less.
• Decrease the setting value when the motor vibrates or hunts while running the drive with a light load.
• Increase this setting when using a long motor cable.
Note:
• Adjust C4-01 so the output current does not exceed the drive rated current while running the drive with a light load.
• Normally, refrain from adjusting this parameter in PM Open Loop Vector Control. It can have a negative effect on torque accuracy.
• Normally, refrain from adjusting this parameter in PM Open Loop Vector Control. Setting this value too high can cause
overcompensation and motor oscillation.
652
V/f CL-V/f OLV CLV AOLV
Selects the mode for the slip compensation function.
V/f CL-V/f OLV CLV AOLV
Sets the gain for the torque compensation function. Sets the gain for motor 1
when multiple motors are driven.
YASKAWA ELECTRIC SIEP C710617 01B YASKAWA AC Drive GA700 Technical Manual
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Default
(Range)
0
(0, 1)
Default
(Range)
Determined by A1-02
(0.00 - 2.50)