Droop control (Pr. 286, Pr. 287)
Pr. 286 "Droop gain"
Pr. 287 "Droop filter time constant"
This function balances the load in proportion to the load torque with or without PLG, and provides speed
This is effective in balancing the load when using multiple inverters.
The output frequency is varied according to the amount of torque current during unbalanced flux vector
control and vector control.
The drooping amount at the rated torque is set by the droop gain as a percentage using the rated
frequency as a reference.
Droop compensation frequency =
Confirm the following items when using the droop control.
1. This function is valid when Pr. 286 ≠ "0" during unbalanced flux vector and vector control.
2. This function is valid when the operation state is constant speed operation.
3. The upper limit of the droop compensation frequency is 120Hz.
4. The rated current follows the value set in Pr. 9 "Motor rated current".
Droop filter time constant
Refer to the following table and set each parameter.
Set the drooping amount at the rated torque as a percentage with respect to the rated
When the setting value is "0", the function will be invalid (no droop control).
Set the time constant of the filter applied on the torque amount current.
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Amount of torque current after filtering
Min. setting unit
0 to 100%
0.00 to 1.00s
Droop compensation frequency
Rated frequency × droop gain