Droop Control (Pr. 286 To Pr. 288) - Mitsubishi Electric FR-A700 Instruction Manual

Special operation
6.24.4

Droop control (Pr. 286 to Pr. 288)

This function is designed to balance the load in proportion to the load torque to provide the speed
drooping characteristic under advanced magnetic flux vector control, real sensorless vector
control and vector control.
This function is effective for balancing the load when using multiple inverters.
Pr. No. Name
286
Droop gain
287
Droop filter time constant
Droop function activation
288
selection
The output frequency is changed according to the magnitude of torque amount current under-
advanced magnetic flux vector control, real sensorless vector control and vector control. The
drooping amount at the rated torque is set by the droop gain as a percentage using the rated fre-
quency (Motor speed when Pr. 288 = "10, 11") as a reference.
The maximum droop compensation frequency is 120Hz.
Fig. 6-257: Droop control
6 - 512
Initial Setting
Description
Value Range
Droop control is invalid
0
(Normal operation)
Droop control is valid.
0%
Drooping amount at the rated
0.1–100% torque as a percentage with
respect to the rated motor fre-
quency.
Time constant of the filter
0.3s 0–1s
applied on the torque current.
Droop control is not exercised
0 during acceleration/
deceleration.
Droop control is always exer-
1 cised during operation.
(with 0 limit)
Droop control is always exer-
2 cised during operation.
0
(without 0 limit)
Droop control is not exercised
during acceleration/decelera-
10
tion.
(Motor speed is referenced)
Droop control is always exer-
11 cised during operation.
(Motor speed is referenced)
−100%
Magnetic flux Magnetic flux Magnetic flux Sensorless Sensorless Sensorless
Parameters referred to
Frequency
command
Droop compensation
frequency
0
Parameter
Vector Vector Vector
Refer to
Section
1 Maximum frequency 6.8.1
PID control
Droop
gain
Torque
100%
I001627E