Hitachi SJ300 Series Stop, Free-run

4–20

Using Intelligent Input Terminals

Free-run Stop When the terminal [FRS] is turned ON, the inverter turns OFF the output and the motor enters the free-run state (coasting). If terminal [FRS] is turned OFF, the output resumes sending power to the motor if the Run command is still active. The free-run stop feature works with other parameters to provide flexibility in stopping and starting motor rotation.

In the figure below, parameter B088 selects whether the inverter resumes operation from 0 Hz (left graph) or the current motor rotation speed (right graph) when the [FRS] terminal turns OFF. The application determines the best setting.

Parameter B003 specifies a delay time before resuming operation from a free-run stop. To disable this feature, use a zero delay time.

Resume from 0Hz		B088=00	Resume from current speed		B088=01
	Zero-frequency start					wait time
Motor			Motor	B003
speed			speed

Switches	t	Switches	t
FRS		FRS
[FW, RV]		[FW, RV]

Operations and Monitoring

Opt.

Symbol

Function Name

Input

Description

Code

State

11

FRS

Free-run Stop

ON

Causes output to turn OFF, allowing

motor to free run (coast) to stop

OFF

Output operates normally, so controlled

deceleration stops motor

Valid for

C001, C002, C003, C004,

Example: (Default input configuration

inputs:

C005, C006, C007, C008

shown—see page 3–47. Jumper position

shown is for –xFU/-xFR models; for –xFE

B003, B088, C011 to C018

Required

models, see page 4–12.)

settings:

FRS

Notes:

TH

FW

8

CM1

5

3

1

• When you want the [FRS] terminal to be

active low (normally closed logic), change

P24

PLC

CM1

7

6

4

2

the setting (C011 to C018) that corresponds

to the input (C001 to C008) that is assigned

the [FRS] function.

See I/O specs on page 4–9.