Applied To Application Where The Direction Of Rotation Changes - Toshiba TOSVERT VF-AS1 Instruction Manual

4.2 Applied to application where the direction
of rotation changes
■ Polarities of torque command and torque limit
If the direction of rotation of the motor changes continuously while the direction in which a force is applied
does not change, the torque control is used with f435 (Prohibition of rotation in any direction other than
the specified one (F or R)) = 0 (disabled).
This setting is used for controlling a motor whose direction of rotation (polarity of torque, that is, power
running or regenerative braking) is determined regardless of the command (F or R command) from the
inverter.
[Hint]
In the system shown in the figures
below, the direction of rotation of
the motor, in other words, its
operating status (power running or
regenerative braking) may change
in succession according to the
circumstances.
Torque command
(Forward/reverse run in succession)
Region ②
Reverse run
Region ③
Torque command > Load
torque
Rotating direction Direction of force
Inverter direction specified by command
Rotational direction
= Forward run
Inverter direction specified
by command = Forward run
Status: Forward run/Positive
torque (power running)
Region: ①
10
Positive torque
f441 : Power running torque limit
Region ①
Region ④
f443 : Regenerative braking torque limit
Negative torque
Torque command < Load
torque
Rotating direction Direction of force
Inverter direction specified by command
Rotational direction
= Reverse run
Inverter direction specified
by command = Forward run
Status: Reverse run/Positive
torque (regenerative)
Region: ②
E6581331
Forward run