Droop Control (Pr. 286 To Pr. 287) - Mitsubishi Electric FR-E700 Instruction Manual

Parameter
6.20.3

Droop control (Pr. 286 to Pr. 287)

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. This function is effective for
balancing the load when using multiple inverters.
Pr. No. Name
286
Droop gain
287
Droop filter time constant
The output frequency is changed according to the magnitude of torque current under advanced
magnetic flux 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.
The maximum droop compensation frequency is 120 Hz.
Fig. 6-162: Droop control
Droop compensation frequency
NOTES Set the droop gain to about the rated slip of the motor.
Rated slip
Droop control is invalid during PID control operation.
The maximum value of frequency after droop compensation is either 120 Hz or Pr. 1 "Maximum
frequency", whichever is smaller.
FR-E700 SC EC/ENE
Initial Value Setting Range Description
Droop control is invalid
0
(Normal operation)
Droop control is valid
0%
Drooping amount at the rated torque as a
0.1–100%
percentage with respect to the rated
motor frequency.
Time constant of the filter applied on the
0.3 s 0–1 s
torque current.
100%
Torque current after filtering
= -------------------------------------------------------------------------------- -
Rated value of base frequency
Synchronous speed at base frequency Rated speed
= ---------------------------------------------------------------------------------------------------------------------------------------------- - 100 [%]
Synchronous speed at base frequency
AD MFVC AD MFVC AD MFVC
Parameters referred to
Frequency
command
Droop compensation
frequency
0
Rated motor frequency Droop gain
-------------------------------------------------------------------------------------------------- -
–
Special operation
Refer to
Section
1 Maximum frequency 6.4.1
PID control 6.20.1
Droop
gain
Torque
100%
I001627E
100
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