Mitsubishi Electric FR-A820-00046 Instruction Manual page 348

Torque control under Real sensorless vector control and vector control
Speed limit mode 2 (Pr. 1113 = "0", initial value)
● Following the polarity change in the torque command, the polarity of the speed limit value
changes. This prevents the speed from increasing in the torque polarity direction. (When the
torque command is 0, the polarity of the speed limit value is positive.)
● When Pr. 807 "Speed limit selection" = "0 or 2", the speed setting value for speed control is applied
for the speed limit. When Pr. 807 "Speed limit selection" = "1", the setting of Pr. 808 "Forward
rotation speed limit/speed limit" is applied for the speed limit.
● When the load has reversed the rotation opposite to the torque polarity, the setting of Pr. 809
"Reverse rotation speed limit/reverse-side speed limit" is applied for the speed limit. (The speed
limit value and reverse-side speed limit value are limited at Pr. 1 "Maximum frequency" (maximum
400 Hz under vector control).)
Reverse side speed
limit value
Pr. 809
Speed limit value
Rotation speed
Pr. 7
Speed limit value
Pr. 809
Reverse side speed
limit value
OFF
Start signal
When the torque command value is positive
Fig. 5-52: Speed limit mode 2
5 - 146
Torque
command value
Speed limit value
Range where torque
control is available
Rotation speed
Reverse side speed
limit value
Pr. 809
Range where torque
control is available
Pr. 8
ON
Rotation speed
Pr. 809
Reverse side speed
limit value
Time
Speed limit value
Start signal
When the torque command value is negative
Range where torque
control is available
Pr. 7
OFF
ON
Parameters
Time
Pr. 8
I002817E