Free-Run Stop - Hitachi SJ300 Series Instruction Manual

4–20
Using Intelligent Input Terminals

Free-run Stop

Switches
[FW, RV]
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
Zero-frequency start
Motor
speed
FRS
Opt.
Symbol Function Name
Code
11 FRS Free-run Stop
C001, C002, C003, C004,
Valid for
C005, C006, C007, C008
inputs:
B003, B088, C011 to C018
Required
settings:
Notes:
• When you want the [FRS] terminal to be
active low (normally closed logic), change
the setting (C011 to C018) that corresponds
to the input (C001 to C008) that is assigned
the [FRS] function.
Resume from current speed
Motor
speed
t
Switches
FRS
[FW, RV]
Input
State
ON Causes output to turn OFF, allowing
motor to free run (coast) to stop
OFF Output operates normally, so controlled
deceleration stops motor
Example: (Default input configuration
shown—see page 3–47. Jumper position
shown is for –xFU/-xFR models; for –xFE
models, see page 4–12.)
TH FW
P24 PLC
See I/O specs on page 4–9.
B088=01
wait time
B003
t
Description
FRS
CM1
8 5 3 1
CM1
7 6 4 2