Mitsubishi Electric FR-A800, Instruction Manual

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(G) Control parameters Parameters
5 - 696
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.
●
When Pr. 288 = "0 to 2" or Advanced magnetic flux control
●
When Pr. 288 = "10, 11"
I001627E
Fig. 5-347: Droop control
Droop compensation
frequency
=
Current for torque after filtering
×
Rated motor frequency × droop gain
Rated torque current 100
Droop compensation
frequency
=
Current for torque after filtering
×
Motor speed × droop gain
Rated torque current 100
NOTE Setting of the droop gains should be approximately the rated slip of the motor.
Ra
te
d
f
re
q
u
e
n
c
y
0 100 % –100 %
Frequency
Droop compensation
frequency
Droop
gain
Torque
Rated slip =
Synchronized speed at the time of base frequency – rated rotation speed
× 100 [%]
Synchronized speed at the time of base frequency