Hitachi SJ200 Series manual 146

4–19

SJ200 Inverter

Free-run Stop

When the terminal [FRS] is turned ON, the inverter stops 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.

B088 = 00

Resume from motor speed

B088 = 01

Zero-frequency start

wait time

Motor

Motor

B003

speed

1

speed

1

FRS

FRS

0

0

[FW],

1

[FW],

1

[RV]

0

[RV]

0

t

t

Option

Terminal

Function Name

Input

Description

Code

Symbol

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 deceler-

ation stops motor

Valid for inputs:

C001, C002, C003, C004,

Example (requires input configuration—

C005, C006

see page 3–41):

Required settings:

B003, B088, C011 to C016

FRS

Notes:

L

6

5

4

3

2

1

PCS

•When you want the [FRS] terminal to be active low

(normally closed logic), change the setting (C011 to C016) that corresponds to the input (C001 to C006) that is assigned the [FRS] function.

Operations Monitoring and

See I/O specs on page 4–6.