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5-11 Sensorless Vector Control
SYSDRIVE MX2 Series USER'S MANUAL (3G3MX2-A@@@@)
5
Functions
Reverse Rotation Prevention Function
This function is enabled only when Sensorless Vector Control is selected for control method
(A044/A244 = 03).
Because of its control characteristics, the Inverter may output a rotation signal in the direction
opposite to that of the RUN command under certain conditions such as in a low-speed range.
If the motor's reverse rotation may cause a problem, such as damage to the machine driven
by the motor, set Reverse Rotation Prevention Selection (b046) to "Enabled".
*1.• As per sign (00) When the polarity of a torque bias signal is (+), the torque increases for forward
rotation, and when it is (−), the torque increases for reverse rotation, regardless of the RUN direction.
• Depends on the RUN direction (01)
The torque bias signal sign and torque bias direction vary depending on the RUN command direction.
Forward command: Applies torque in the same direction as the torque bias.
Reverse command: Applies torque in the reversed direction of the torque bias.
Parameter
No.
Function name Data
Default
setting
Unit
b046
Reverse Rotation
Prevention
Selection
00: Disabled
00 −
01: Enabled (No reverse rotation)
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