Toshiba VF-AS1 instruction manual Torque limit

E6581301

6.25Torque limit

6.25.1Torque limit switching

￿￿￿￿	: Power running torque limit 1	￿￿￿￿	: Power running torque limit 3
	selection		level
￿￿￿￿	: Power running torque limit 1	￿￿￿￿	: Regenerative braking torque
	level		limit 3 level
￿￿￿￿	: Regenerative braking torque	￿￿￿￿	: Power running torque limit 4
	limit 1 selection		level
￿￿￿￿	: Regenerative braking torque	￿￿￿￿	: Regenerative braking torque
	limit 1 level		limit 4 level
￿￿￿￿	: Power running torque limit 2	￿￿￿￿	: Constant output zone torque
	level		limit selection

￿￿￿￿: Regenerative braking torque limit 2 level

• Function

This function is to decrease or increase the output frequency according to the loading condition when the motor torque reaches the limit level. Setting a torque limit parameter at 250% means “Invalid.”

With this function, you can also select from between limiting the constant output or limiting the constant torque in the constant output zone.

This function is not operate when the parameter ￿￿=￿,￿,￿ setting.

■ Setting methods 6

(1)When setting limits to torque, use internal parameters (Torque limits can also be set with an external control device.)

Positive torque

			+250% torque
		￿￿￿￿ ￿
	￿￿￿￿		: ￿￿￿￿=￿
			: ￿￿￿￿=￿
		Power
	Regenerative	running
Reverse run	Power	Regenerative	Forward run
	running
		￿￿￿￿
	￿￿￿￿
			-250% torque

Negative torque

With the parameter ￿￿￿￿, you can select the item that is limited in the constant output zone (somewhat weak magnetic field) from between constant output (￿￿￿￿=￿: default setting) and constant torque (￿￿￿￿=￿). When you select the constant torque limit option, you should preferably select the output voltage limit option (￿￿￿￿=￿) with the parameter ￿￿￿￿ (base frequency voltage selection).

Torque limits can be set with the parameters ￿￿￿￿ and ￿￿￿￿. [Setting of power running torque]

￿￿￿￿ (Power running torque limit 1 selection)	: Set at ￿ (￿￿￿￿)
￿￿￿￿ (Power running torque limit 1)	: Set a desirable torque limit level.
[Setting of regenerative torque]

￿￿￿￿(Regenerative braking torque limit 1 selection) : Set at ￿ (￿￿￿￿)

￿￿￿￿ (Regenerative braking torque limit 1) : Set a desirable torque limit level.

F-45