Hitachi SJ300 Series Signal, Over-torque

4–50

Using Intelligent Output Terminals

Over-torque

Signal

Operations and Monitoring

The Over-torque function [OTQ] turns ON when the estimated value of output torque of motor increases more than the arbitrary level set for the output. Recall that the torque limit function, covered in “Torque Limit” on page 4–37, actually limits the torque during certain operating conditions. Instead, the over-torque output feature only monitors the torque, turning ON output [OTQ] if the torque is above programmable thresholds you set. The [OTQ] function is valid only for sensorless vector control, 0-Hz domain sensorless vector control, or vector control with sensor. Do not use the [OTQ] output, except for these inverter operational modes.

Code	Function/Description	Data or Range
C055	Over-torque, forward-driving level setting	0 to 200%
C056	Over-torque, reverse-regenerating, level setting	0 to 200%
C057	Over-torque, reverse-driving, level setting	0 to 200%
C058	Over-torque, forward-regenerating, level setting	0 to 200%
C021	Intelligent output terminal [11] to [15] function	07
to
C025

The assignment of the Over-torque function to an output terminal [OTQ] is detailed in the following table.

Opt.

Symbol

Function Name

Output

Description

Code

State

07

OTQ

Over-torque

ON

when estimated torque exceeds the level

set in C055 to C058

OFF

when estimated torque is below the levels

set in C055 to C058

Valid for

11, 12, 13, 14, 15,

Example: (Default output configuration

outputs:

AL0 – AL2

shown—see page 3–53.)

Required

C055, C056, C057, C058

Inverter output

settings:

A044 = 03 or 04 or 05

terminal circuit

OTQ

Notes:

• This output is valid only for sensorless

14

13

11

vector control, 0-Hz domain sensorless vector

control, or vector control with sensor

15

CM2

12

+

RY –

See I/O specs on page 4–9.