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Droop Control (pr. 286, Pr. 287) - Mitsubishi Electric FR-A500 Instruction Manual

Transistorized inverter.
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4.2.64 Droop control (Pr. 286, Pr. 287)

Pr. 286 "droop gain"
Pr. 287 "droop filter constant"
This function balances the load in proportion to the load torque with or without encoder, 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
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
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.
Factory setting
286
0%
287
0.3s
Rated frequency
<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.
287
Set the time constant of the filter applied on the torque amount current.
Pr. 342
Refer to Pr. 117.
Amount of torque current after filtering
Rated current
"0" during unbalanced flux vector and vector control.
Setting range
0 to 100%
0.00 to 1.00s
Frequency
-100 %
Details
181
Related parameters
Pr. 9 "electronic thermal O/L relay"
Pr. 71 "applied motor"
Pr. 84 "rated motor frequency"
Rated frequency droop gain
Droop compensation
frequency
100 %
0
PARAMETERS
100
Droop gain
Torque
4

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