Mitsubishi Electric FR-A720-0.4K Instruction Manual page 370

Special operation and frequency control
(2) Limit the frequency after droop compensation (0 limit)
· Setting Pr. 288 under real sensorless vector control or vector control can limit the frequency command when the
frequency after droop compensation is negative.
Pr. 288
Setting
Under advanced magnetic flux vector control
0
(initial value),
10
Droop control is not exercised during acceleration/
deceleration.
Note that the frequency command after droop control is
1, 11 limited at 0.5Hz when the frequency command after
droop control is negative.
Droop compensation amount is determined using the
rated motor frequency as reference.
2
REMARKS
The maximum value of frequency after droop compensation is either 120Hz or Pr. 1 Maximum frequency , whichever is smaller.
♦ Parameters referred to ♦
Pr. 1 Maximum frequency
360
Refer to page 153
Description
Under real sensorless vector control
or vector control
Droop control is not exercised during acceleration/
deceleration.
Note that the frequency command is limited at 0Hz when
the frequency command after droop control is negative.
When Pr. 288 = "10", droop compensation amount is
determined using the motor speed as reference.
Droop control is always exercised during operation.
Note that the frequency command is limited at 0Hz when
the frequency command after droop control is negative.
When Pr. 288 = "11", droop compensation amount is
determined using the motor speed as reference.
Droop control is always exercised during operation.
Note that under vector control, the frequency command
is not limited at 0Hz even when the frequency command
after droop control is negative.
(The frequency command is limited at 0Hz under real
sesorless vector control.)