C4: Torque Compensation - YASKAWA T1000V Technical Manual

No.
C3-04 Slip Compensation Selection during Regeneration
Setting 0: Disabled
Slip compensation is not provided. Depending on the load and operation mode (motoring or regenerative) the actual
motor speed will be lower or higher than the frequency reference.
Setting 1: Enabled
Slip compensation is enabled during regenerative operation. It will not be active at output frequencies below 6 Hz.
C3-05: Output Voltage Limit Operation Selection
■
Determines if the motor flux reference is automatically reduced when output voltage reaches the saturation range.
No.
C3-05
Setting 0: Disabled
Setting 1: Enabled

◆ C4: Torque Compensation

The torque compensation function compensates for insufficient torque production at start-up or when a load is applied.
Note: Before making changes to the torque compensation parameters make sure the motor parameters and V/f pattern are set properly
or perform Auto-Tuning.
■ C4-01: Torque Compensation Gain
Sets the gain for the torque compensation function.
No.
C4-01
<1> Default setting depends on the control mode selection in parameter A1-02. The value shown here is for V/f Control.
Dependent Parameter Default Values on page
Torque Compensation in V/f Control:
The drive calculates the motor primary voltage loss using the output current and the terminal resistance value (E2-05)
and then adjusts the output voltage to compensate insufficient torque at start or when load is applied. The effect of this
voltage compensation can be increased or decreased using parameter C4-01.
Torque Compensation in Open Loop Vector Control:
The drive controls the motor excitation current and torque producing current separately. Torque compensation affects the
torque producing current only. C4-01 works as a factor of the torque reference value that builds the torque producing
current reference.
Adjustment
Although this parameter rarely needs to be adjusted, small changes in increments of 0.05 may help in the following
situations:
• Increase this setting when using a long motor cable.
• Decrease this setting when motor oscillation occurs.
Adjust C4-01 so that the output current does not exceed the drive rated current.
C4-02: Torque Compensation Primary Delay Time 1
■
Sets the delay time used for applying torque compensation.
No.
C4-02 Torque Compensation Primary Delay Time 1
<1> Default setting depends on the control mode selection in parameter A1-02. The value shown here is for V/f Control.
Dependent Parameter Default Values on page
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
Parameter Name
Parameter Name
Output Voltage Limit Operation Selection
Parameter Name
Torque Compensation Gain
364.
Parameter Name
364.
5.3 C: Tuning
Setting Range
0 or 1
Setting Range
0 or 1
Setting Range
0.00 to 2.50
Refer to Control Mode
Setting Range
0 to 60000 ms 200 ms
Refer to Control Mode
Default
0
Default
0
Default
1.00
<1>
5
Default
<1>
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