Toshiba VF-A7 instruction manual Polarity of torque command

3.3.2 Polarity of torque command

When using the torque limit function in torque control mode or speed control mode, change the polarity of the torque command, as required.

Title	Function	Title Adjustment range	Default setting
	Torque reference	: Fixed direction	
	mode selection	: Forward/reverse permitted

(1) Power-running/regenerative torque

This setting is used when the machine requires a frequent change in the direction of rotation of the motor.

Operation by Reverse run command (R)

Operation by forward run command (F)

Negative Torque

 : Regenerative torque limit #1

Positive torque
	:	Power running torque
		limit	#1

Reverse run

Area②

Area③

Same torque reference

Area①

Forward run

Area④

 : Regenerative torque limit #1

 : Power running torque limit #1 Positive torque

Negative Torque

 Torque reference mode selection	→: Fixed direction
 Reverse run prohibition	→: Prohibited except specified direction
 Torque limit mode (polarity)	→: Power-running/regenerative torque limit

(2) Positive/negative torque

This setting is used when the machine requires a frequent change in the direction of rotation of the motor, though a load is applied always in the same direction.

Torque command	Positive torque
(Continuous forward/reverse)		 : Power-running torque limit #1
	Area②	Area①
Reverse run		Forward run
	Area③	Area④
		 : Regenerative torque limit #2

Negative Torque

 Torque reference mode selection	→: Forward/reverse permitted
 Reverse run prohibition	→: Both directions allowed
 Torque limit mode (polarity)	→: Positive/negative torque limit

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