Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 279

• When the torque command becomes negative, the setting of Pr.809 Reverse rotation speed limit/reverse-side speed
limit is applied to prevent the speed from increasing in the reverse 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
Reverse-side
speed limit value
-Pr.809
For forward rotation command
Rotation speed
Speed limit value
-Pr.809
Reverse-side
speed limit value
OFF
Start signal
by forward rotation command (winding)
 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 following figures.)
• When Pr.807 Speed limit selection = "0, 2", the setting during speed control is applied for the speed limit. When Pr.807
Speed limit selection = "1", Pr.808 Forward rotation speed limit/speed limit is applied for the speed limit.
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5. PARAMETERS
5.4 Torque control under Real sensorless vector control and Vector control
Winding
(power driving)
Unwinding
(regenerative driving)
Torque
command
value
Speed limit value
Forward rotation
power driving
Rotation speed
Range where torque
control is available
Range where torque
control is available
Pr.7 Pr.8
Time
ON
For power driving
Forward
rotation
Reverse
rotation
Reverse-side
speed limit value
-Pr.809
Reverse rotation
regenerative driving
For reverse rotation command
Rotation speed
Speed limit value
-Pr.809
Reverse-side
Pr.7
speed limit value
OFF ON
Start signal
For regenerative driving
by reverse rotation command (unwinding)
Speed
limit
value Torque command value
Rotation speed
Range where torque
control is available
Range where torque
control is available
Time
Pr.8