Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual page 280

• 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
Torque
command
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
OFF ON
Start signal
For power driving
by reverse rotation command (winding)
 Speed limit mode switching via external terminals (Pr.1113 = "10")
• The speed limit mode can be switched between 3 and 4 using the Torque control selection (X93) signal.
• To assign the X93 signal, set "93" in any of Pr.178 to Pr.189(Input terminal function selection).
X93 signal
Mode 3 (positive torque command, same status as
OFF
setting Pr.1113 = 1)
Mode 4 (negative torque command, same status
ON
as setting Pr.1113 = 2)
Winding
(power driving)
Forward
rotation
Unwinding
(regenerative driving)
Reverse
rotation
Reverse-side
speed limit value
value
Pr.809
Rotation speed
Range where torque
control is available
Range where torque
control is available
Time
Pr.8
Speed limit mode
5.4 Torque control under Real sensorless vector control and Vector control
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
OFF ON
Start signal
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
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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