Mitsubishi Electric FR-A820-00046 Instruction Manual page 322

Torque control under Real sensorless vector control and vector control
Speed limit mode 4 (Pr. 1113 = "2")
● Select this mode when the torque command is negative. The forward rotation command is for
regenerative driving (such as unwinding) and the reverse rotation command is for power driving
(such as winding). (Refer to each inside of the frames in the following figures.)
● 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 torque command becomes positive, the setting of Pr. 809 "Reverse rotation speed limit/
reverse-side speed limit" is applied to prevent the speed from increasing in the forward rotation
direction. (The speed limit value and reverse-side speed limit value are limited at Pr. 1 "Maximum
frequency" (maximum 400 Hz under vector control).)
Unwinding
(regenerative driving)
Forward
rotation
Winding
(power driving)
Reverse
rotation
Speed limit value
Reverse rotation
power driving
For reverse rotation command
Rotation speed
Pr. 809
Reverse side speed
limit value
Speed limit value
Pr. 7
Start signal OFF ON
For power driving
by reverse rotation command (winding)
Fig. 5-54: Speed limit mode 3
5 - 142
Winding
(power driving)
Forward
rotation
Unwinding
(regenerative driving)
Reverse
rotation
Reverse side speed
Torque
limit value
command
value
Pr. 809
Rotation speed
Range where torque
control is available
Range where torque
control is available
Time
Pr. 8
Torque command
value
Speed limit value
Forward rotation
regenerative driving
For forward rotation command
Range where torque
Rotation speed control is available
Pr. 809
Reverse side speed
limit value
Speed limit value
Pr. 7
Start signal OFF ON
For regenerative driving
by forward rotation command (unwinding)
Reverse side speed
limit value
Pr. 809
Range where torque
control is available
Rotation speed
Time
Pr. 8
Parameters
I002820E, I002821E_D