Hitachi SJ700-2 instruction manual Torque biasing function, Torque control function

Chapter 4 Explanation of Functions

4.3.4 Torque biasing function

The torque biasing function allows you to make the inverter bias the torque command generated during the operation in speed control mode. You can effectively use this function for inverter applications to a lift or other elevating machines.

Related code

P036: Torque biasing mode selection

P037: Torque bias setting

P038: Torque biasing polarity selection

d010: Torque bias monitoring

Item	Function code	Data or range of data	Description
Torque biasing mode	P036	00	None
		01	Bias setting from the digital operator
selection
		02	Bias setting via the O2 terminal (*1)
Torque bias setting	P037	-200 to +200 (%)	Valid when "P036" = "01"
Torque biasing polarity	P038	00	Depending on the sign of bias value
selection (*2)		01	Depending on the motor rotation direction

*1 When the torque bias is set as a signal input via the O2 terminal, the inverter recognizes the signal voltage -10 to +10 (V) as the bias value -200 to +200 (%).

*2 1) When "00" (depending on the sign of the bias value) is specified:

Regardless of the direction of motor rotation, torque in the forward direction increases when the torque bias signal indicates a positive (+) value. Torque in the reverse direction increases when the torque bias signal indicates a negative (-) value.

2)When "01" (depending on the motor rotation direction) is specified:

The sign of the bias value indicated by the torque bias signal and the direction of the torque biasing change according to the rotation direction specified by the operation command.

With a forward operation command: the torque is generated in the same direction as that specified by the sign of the torque bias value.

With a reverse operation command: the torque is generated in the opposite direction to that specified by the sign of the torque bias value.

4.3.5 Torque control function

The torque control function is effective in the V2 control mode. You can use the inverter not only under the speed control or pulse train position control but also with this torque control function. You can use this function effectively for inverter applications to, for example, a winding machine.

To operate the inverter to drive the motor under torque control, assign function "52" (ATR) to an intelligent input terminal. The torque command input is enabled when the ATR terminal is on. You can select one of four torque command input methods (digital operator and three analog input terminals) by the torque command input selection (P034).

Related code

P033: Torque command input selection

P034: Torque command setting

P035: Polarity selection at the torque command input via the O2 terminal P039: Speed limit for torque-controlled operation (forward rotation)

P040: Speed limit for torque-controlled operation (reverse rotation) d009/d010/d012: Torque command monitoring P036: Torque biasing mode selection

P037: Torque bias setting

P038: Torque biasing polarity selection

d010: Torque bias monitoring

C001 to C008: Terminal [1] to [8] functions

Item	Function code	Data or range of data	Description
		00	Input from the O terminal
Torque command input	P033	01	Input from the OI terminal
selection		02	Input from the O2 terminal
		03	Input from the digital operator
Torque command setting	P034	0 to 200 (%)	Torque setting for the input from the digital
			operator (P033 = 03)
Polarity selection at the torque		00	Depending on the sign of torque value
command input via the O2	P035	01	Depending on the motor rotation direction
terminal
Speed limit for		0.00 to 99.99 or 100.0 to
torque-controlled operation	P039
		400.0 (Hz)
(forward rotation)
Speed limit for		0.00 to 99.99 or 100.0 to
torque-controlled operation	P040
		400.0 (Hz)
(reverse rotation)
		00	None
Torque biasing mode selection	P036	01	Bias setting from the digital operator
		02	Bias setting via the O2 terminal
Torque bias setting	P037	-200 to +200 (%)	Valid when "P036" = "01"
Torque biasing polarity	P038	00	Depending on the sign of bias value
selection		01	Depending on the motor rotation direction
Terminal function	C001 to C008	52	ATR: Permission for torque command input

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