Справочник Пользователя для Mitsubishi Electronics FR-A500

185

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.

z

 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.

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 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".

Refer to the following table and set each parameter.

286

0%

0 to 100%

287

0.3s

0.00 to 1.00s

286

Set the drooping amount at the rated torque as a percentage with respect to the rated 
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.

Related parameters

Pr. 9 "electronic thermal O/L relay"
Pr. 71 "applied motor"

Pr. 84 "rated motor frequency"

Droop compensation frequency =

Amount of torque current after filtering

Rated current

Rated frequency droop gain

100

Droop compensation

frequency

Torque

100

%

Droop gain

-100

%

Frequency

0

Rated frequency