Mitsubishi Electric FR-A820-00046 Instruction Manual page 738

(A) Application parameters
WARNING:
P
If the X22 is turned OFF while the start signal is input, the motor will accelerate toward the speed
of the current speed command. Therefore, to stop, turn the forward rotation (reverse rotation)
signal OFF.
Orientation from the forward rotation direction (Pr. 393 = "1, 11") (Vector control)
● This method is used to improve the stopping precision and maintain the mechanical precision
when the backlash is large.
● If the motor is running in the forward rotation direction, it will make an orientation stop with the
same method as "orientation from the current rotation direction".
● If the motor is running in reverse, it will decelerate, change to the forward rotation direction, and
then orientation stop will be executed.
Orientation from the reverse rotation direction (Pr. 393 = "2, 12") (Vector control)
● If the motor is running in the reverse rotation direction, it will make an orientation stop with the
same method as "orientation from the current rotation direction".
● If the motor is running in forward, it will decelerate, change to the reverse rotation direction, and
then orientation stop will be executed.
5 - 536
Speed
(forward
rotation)
X22 OFF ON
ORA OFF
Speed
(reverse
rotation)
X22 OFF ON
ORA
OFF
Speed
(forward
rotation)
X22 OFF ON
ORA OFF
Speed
(reverse
rotation)
X22 OFF ON
ORA
OFF
Fig. 5-255:
Orientation from the forward rotation direction
Time
ON
Time
ON
Fig. 5-256:
Orientation from the reverse rotation direction
Time
ON
Time
ON
Parameters
I001585E, I001586E
I001587E, I001588E