Hitachi SJ700-2 instruction manual Torque limitation function

Related code

A044/A244: V/F characteristic curve selection, 1st/2nd motors

b040: Torque limit selection

b041 to b044: Torque limits (1) to (4)

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

C021 to C025: Terminal [11] to [15] functions

Chapter 4 Explanation of Functions

4.2.100 Torque limitation function

The torque limitation function allows you to limit the motor output torque when "03" (sensorless vector control), "04" (0Hz-range sensorless vector control), or "05" (vector control with sensor) is specified for the V/F characteristic curve selection (A044/A244).

You can select one of the following four torque limitation modes with the torque limit selection (b040):

1)Quadrant-specific setting mode

In this mode, individual torque limit values to be applied to four quadrants (i.e. forward powering, reverse regeneration, reverse powering, and forward regeneration) are set as the torque limits 1 to 4 (b041 to b044), respectively.

2)Terminal-switching mode

In this mode, the torque limit values set in the torque limits 1 to 4 (b041 to b044) are switched from one another according to the combination of the states of torque limit switch terminals 1 and 2 (TRQ1 and TRQ2) assigned to intelligent input terminals. A single selected torque limit is valid in all operating states of the inverter.

3)Analog input mode

In this mode, a torque limit value is set by a voltage applied to the control circuit terminal O2. The voltage range 0 to 10 V corresponds to the torque limit value range 0 to 200%. A single selected torque limit is valid in all operating states of the inverter.

4)Option (option 1/2) mode

This mode is valid when the option board (SJ-DG) is used. For details on this mode, refer to the instruction manual for the option board.

If function "40" (TL: whether to enable torque limitation) has been assigned to an intelligent input terminal, the torque limitation mode selected by the setting of "b040" is enabled only when the TL terminal is turned on. When the TL terminal is off, torque limit settings are invalid, and the maximum torque setting is applied as a torque limit. If the TL function has not been assigned to any intelligent input terminal, the torque limitation mode selected by the setting of "b040" is always enabled.

Each torque limit value used for this function is expressed as a ratio of the maximum torque generated when the inverter outputs its maximum current on the assumption that the maximum torque is 200%. Note that each torque limit value does not represent an absolute value of torque. The actual output torque varies depending on the motor.

If the torque limited (TRQ) signal function is assigned to an intelligent output terminal, the TRQ signal will turn on when the torque limitation function operates.

Item	Function code	Data or range of data	Description
		03	Sensorless vector control
V/F characteristic curve selection	A044/A244	04	0Hz-range sensorless vector control
		05	Vector control with sensor (not
			available for A244)
		00	Quadrant-specific setting mode
Torque limit selection	b040	01	Terminal-switching mode
		02	Analog input mode
		03	Option 1 mode
		04	Option 2 mode
Torque limit (1)	b041	0 to 200 (%)	Forward powering (in
			quadrant-specific setting mode)
Torque limit (2)	b042	0 to 200 (%)	Reverse regeneration (in
			quadrant-specific setting mode)
Torque limit (3)	b043	0 to 200 (%)	Reverse powering (in
			quadrant-specific setting mode)
Torque limit (4)	b044	0 to 200 (%)	Forward regeneration (in
			quadrant-specific setting mode)
Terminal function	C001 to C008	40	Whether to enable torque limitation
		41	Torque limit switch 1
		42	Torque limit switch 2
Terminal function	C021 to C025	10	Torque limited signal

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