Hitachi SJ300 Series manual 176

4–38

Using Intelligent Input Terminals

The 4-quadrant operation mode for torque limiting (B040=00) is illustrated in the figure to the right. The instantaneous torque depends on inverter activity (acceleration, constant speed, or deceleration), as well as the load. These factors determine the operating quadrant at any particular time. The parameters in B041, B042, B043 and B044 determine the amount of torque limiting that the inverter applies.

	Torque	+			B40=00
Reverse-regenerating			Forward-driving
	B042			B041
RV						FW
Reverse-driving			Forward-regenerating
	B043			B044

Operations and Monitoring

The terminal selection mode (B040=01) uses two intelligent inputs [TRQ1] and [TRQ2] for the binary-encoded selection of one of the four torque limit parameters B041, B042, B043 and B044.

Opt.

Symbol

Function Name

Input

Description

Code

State

40

TL

Torque limit enable

ON

Enables torque limiting

OFF

Disables torque limiting

41

TRQ1

Torque limit select 1

0 / 1

Torque limit select, Bit 1 (LSB)

42

TRQ2

Torque limit select 2

0 / 1

Torque limit select, Bit 2 (MSB)

Valid for inputs:

C001, C002, C003, C004,

Examples: (Require input configuration—

C005, C006, C007, C008

see page 3–47. Jumper position shown is

for –xFU/-xFR models; for –xFE models,

Required

B040, B041, B042, B043,

see page 4–12.)

settings:

B044

TL

Notes:

TH

FW

8

CM1

5

3

1

• Both the 4-quadrant mode and terminal

P24

PLC

CM1

7

6

4

2

switching mode of torque limiting use input

[TL] for enable/disable.

•Inputs TRQ1 and TRQ2 apply only to

terminal switching mode.

Intelligent

Torque limit

TL

Inputs

parameter

TRQ2 TRQ1

TRQ2

TRQ1

TH

FW

8

CM1

5

3

1

OFF

OFF

B041

P24

PLC

CM1

7

6

4

2

OFF

ON

B042

ON

OFF

B043

ON

ON

B044

•When using the torque limit function at low

speed, also use the overload restriction
feature.	See I/O specs on page 4–9.