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Droop Control (pr. 286, Pr. 287) - Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual

Transistorized inverter, high function & low acoustic noise.
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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
drooping characteristics.
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
z
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.
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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".
Parameter No.
Name
286
Droop gain
287
Droop filter time constant
<Setting>
Refer to the following table and set each parameter.
Parameter No.
Set the drooping amount at the rated torque as a percentage with respect to the rated
286
frequency.
When the setting value is "0", the function will be invalid (no droop control).
287
Set the time constant of the filter applied on the torque amount current.
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Amount of torque current after filtering
Rated current
Setting range
Min. setting unit
0 to 100%
0.01%
0.00 to 1.00s
0.01s
Droop compensation frequency
100%
Details
168
PARAMETERS
Rated frequency × droop gain
×
100
Factory setting
0%
0.3s
Droop gain
Torque

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