4–37

 

 

 

 

 

SJ300 Inverter

 

 

 

 

 

 

 

 

 

 

 

 

Torque Limit

The Torque Limit function limits the motor output torque for sensorless vector control, sensor-

 

 

 

less vector control 0Hz domain, or vector control with feedback.

 

 

 

In the torque limit function, the following operational modes are available (selected by B040):

 

 

 

1. Four-quadrant individual setting mode – This mode sets torque limit in 4 zones, forward

 

 

 

driving and regenerating, reverse driving and regenerating. Limits for each quadrant are set

 

 

 

with B041 – B044 individually.

 

 

 

 

 

 

 

2. Terminal selection mode – By use of torque limit select intelligent input terminals 1 and 2,

 

 

 

this mode changes and uses torque limits 1 – 4 set in B041 – B044. Selected torque limit

 

 

 

range is valid in all four quadrants.

 

 

 

 

 

 

3. Analog input mode – This mode sets torque limit value by the voltage applied to terminal

 

 

 

[O2] (referenced to [L] for ground. An input of 0 – 10V corresponds to the torque limit

 

 

 

value of 0 to 200%. The selected torque limit value is valid in all four quadrants (whether

 

 

 

forward or reverse move, driving or regenerating).

 

 

 

 

 

 

4. Expansion Cards 1 and 2 – This function is valid when using the expansion card (SJ-DG).

 

 

 

Please refer to the SJ-DG instruction manual.

 

 

 

 

 

 

When the torque limit enable function [TL] is assigned to an intelligent input terminal, torque

 

 

 

limiting occurs only when [TL] is ON. When the [TL] input is OFF, the inverter always uses the

 

 

 

default torque control limit of 200% maximum. That torque limit value corresponds to 200% of

 

 

 

the maximum inverter output current. Therefore, the output torque also depends on the particu-

 

 

 

lar motor in use. When the over-torque output [OTQ] is assigned in the intelligent output selec-

 

 

 

tion, it turns ON when the inverter is performing torque limiting.

 

 

 

 

 

 

 

 

 

 

 

 

 

Code

Function

 

Data or Range

Description

 

 

 

 

 

 

 

 

 

 

Monitoringand

 

 

 

 

 

 

 

 

 

 

 

 

 

00

V/f Constant torque

 

Operations

 

 

 

 

01

V/f Variable torque

 

 

 

 

 

 

 

 

 

A044 /

Control method

 

02

V/f Free-setting torque *1

 

 

 

 

A244

selection

 

03

Sensorless vector *1

 

 

 

 

 

 

 

04

Sensorless vector, 0 Hz domain *1

 

 

 

 

 

 

 

05

Vector control with sensor *2

 

 

 

 

 

 

 

 

 

 

 

 

 

B040

 

 

00

4-quadrant individual setting

 

 

 

 

 

 

 

 

 

 

Torque limit

 

01

Terminal selection

 

 

 

 

 

 

02

Analog [O2] input

 

 

 

 

 

selection

 

 

 

 

 

 

 

03

Expansion card 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

04

Expansion card 2

 

 

 

 

 

 

 

 

 

 

 

 

 

B041

Torque limit 1

 

0 to 200%

Forward-driving in 4-quadrant mode

 

 

 

 

 

 

 

 

 

 

 

 

 

B042

Torque limit 2

 

0 to 200%

Reverse-regenerating in 4-quadrant

 

 

 

 

 

 

 

 

mode

 

 

 

 

 

 

 

 

 

 

 

 

 

B043

Torque limit 3

 

0 to 200%

Reverse-driving in 4-quadrant mode

 

 

 

 

 

 

 

 

 

 

 

 

 

B044

Torque limit 4

 

0 to 200%

Forward-regenerating in 4-quadrant

 

 

 

 

 

 

 

 

mode

 

 

 

 

 

 

 

 

 

 

 

 

 

C001

Intelligent input

 

40

Torque limit enable

 

 

 

 

to

terminal [1] to [8]

 

41

Torque limit selection, bit 1 (LSB)

 

 

 

 

C008

function

 

42

Torque limit selection, bit 2 (MSB)

 

 

 

 

 

 

 

 

 

 

 

 

 

C021

Intelligent output

 

10

In torque limit

 

 

 

 

to

terminal [11] to [15]

 

 

 

 

 

 

 

 

C025

function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Note 1: Unavailable for A344

Note 2: Unavailable for A244 and A344