Hitachi SJ2002 Series Instruction Manual page 162

4–20
Using Intelligent Input Terminals
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.
Motor
speed
FRS
[FW],
[RV]
Option Terminal
Code Symbol
11 FRS
Valid for inputs:
Required settings:
Notes:
•
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.
B088 = 00
Zero-frequency start
1
0
1
0
Function Name
Free-run Stop
C001, C002, C003, C004,
C005, C006
B003, B088, C011 to C016
Resume from motor speed
Motor
speed
1
FRS
0
1
[FW],
0
[RV]
t
Input
State
ON Causes output to turn OFF, allowing motor to
free run (coast) to stop
OFF Output operates normally, so controlled deceler-
ation stops motor
Example (requires input configuration—
see page 3–45):
L 6
See I/O specs on page 4–6.
B088 = 01
B003 wait time
Description
FRS
5 4 3 2 1 PCS
t