Mitsubishi Electric FR-A820-00046 Instruction Manual page 936

(G) Control parameters
Droop control
● Droop control is enabled for Advanced magnetic flux vector control, Real sensorless vector
control, vector control, and PM sensorless vector control.
● Output frequency will change depending on the size of the current for torque with the droop
control.
Set % of the droop amount of rated torque with rated frequency (motor speed in case of Pr. 288
= "10, 11") as a reference for the droop gain.
● Upper limit of the droop compensation frequency is smaller frequency between 400 Hz and Pr. 1
"Maximum frequency".
● During PM sensorless vector control, the lowest frequency among 400 Hz, Pr. 1, and maximum
motor frequency becomes the upper limit droop compensation frequency.
Fig. 5-365:
● When Pr. 288 = "0 to 2" or Advanced magnetic flux control
Droop compensation
frequency
● When Pr. 288 = "10, 11"
Droop compensation
frequency
NOTE Setting of the droop gains should be approximately the rated slip of the motor.
Rated slip =
5 - 734
–100 %
Droop control
Current for torque after filtering
=
Rated torque current
Current for torque after filtering
=
Rated torque current
Synchronized speed at the time of base frequency – rated rotation speed
Synchronized speed at the time of base frequency
Frequency
Droop compensation
frequency
0
Rated motor frequency × droop gain
×
Motor speed × droop gain
×
Parameters
Droop
gain
Torque
100 %
I001627E
100
100
× 100 [%]