Hitachi SJ700-2 instruction manual Torque LAD stop function, High-torque multi-motor operation

Related code

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

F001: Output frequency setting

b040: Torque limit selection

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

H002/H202: Motor data selection, 1st/2nd motors

H003/H203: Motor capacity, 1st/2nd motors

H004/H204: Motor poles setting, 1st/2nd motors

H005/H205: Motor speed constant, 1st/2nd motors

H020/H220: Motor constant R1, 1st/2nd motors

H021/H221: Motor constant R2, 1st/2nd motors

H022/H222: Motor constant L, 1st/2nd motors

H023/H223: Motor constant Io, 1st/2nd motors

H024/H224: Motor constant J, 1st/2nd motors

H050/H250: PI proportional gain, 1st/2nd motors

H051/H251: PI integral gain, 1st/2nd motors

H052/H252: P proportional gain setting, 1st/2nd motors

Chapter 4 Explanation of Functions

4.2.102 Torque LAD stop function

The torque LAD stop function is effective 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). This function temporarily stops the frequency-based deceleration function (LAD) when the torque limitation function operates.

Related code

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

b040: Torque limit selection

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

b045: Torque limit LADSTOP enable

Item	Function code	Data or range of data	Description
V/F characteristic	A044/A244	03	Sensorless vector control
		04	0Hz-range sensorless vector control
curve selection
		05	Vector control with sensor (not available for A244)
		00	Quadrant-specific setting mode
Torque limit	b040	01	Terminal-switching mode
		02	Analog input mode
selection
		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)
Torque limit	b045	00	Disabling the torque LAD stop function
LADSTOP enable		01	Enabling the torque LAD stop function
Terminal function	C001 to C008	40	Whether to enable torque limitation
		41	Torque limit switch 1
		42	Torque limit switch 2

4.2.103 High-torque multi-motor operation

The high-torque multi-motor operation function allows you to make a single inverter operate the two motors (having the same specifications) that drive a single load (machine). This function is effective when the V/F characteristic curve selection is the sensorless vector control or 0Hz-range sensorless control.

To use the function, adjust the inverter settings required for the sensorless vector control (see Section 4.2.92) or 0Hz-range sensorless control (see Section 4.2.93), except for the motor constant settings. Adjust the motor constants as follows:

1) For constants R1, R2, and L, specify a value half as large as that normally specified for one motor.

2) For constant Io, specify a value twice as large as that normally specified for one motor.

3) For constant J, specify a value half as large as the total moment of inertia of the two motors and the load connected to them.

Select the motor capacity that is closest to the collective capacity of both motors.

If different loads are driven by the two motors operated by the inverter, the load fluctuations on one motor may change the other motor's operation status, and the inverter may be unable to normally control the motors. Be sure to configure your system so that the motors drive only a single load or multiple loads that can, at least, be recognized as a single load.

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