YASKAWA OYMC V1000, Programming Manual

Page: 84 / 408

1.3 C: Tuning
84 YASKAWA ELECTRIC SIEP C710606 10A YASKAWA AC Drive - V1000 PRELIM. Programming Manual
Setting 0: Disabled
Setting 1: Enabled
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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.
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C4-01: Torque Compensation Gain
Sets the gain for the torque compensation function.
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.
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C4-02: Torque Compensation Primary Delay Time 1
Sets the delay time used for applying torque compensation.
No. Parameter Name Setting Range Default
C4-01 Torque Compensation Gain 0.00 to 2.50
Determined by
A1-02