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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.
Option
Code
Terminal
Symbol
Function Name State Description
ON Causes output to turn OFF, allowing motor to free
run (coast) to stop
11 FRS Free-run Stop
OFF Output operates normally, so controlled
deceleration and stops motor
Valid for inputs: C001~C005
Required settings B003, B088, C011 to C015
Notes:
x When you want the [FRS] terminal to be active
low (normally closed logic), change the setting
(C011 to C015) that corresponds to the input
(C001 to C005) that is assigned the [FRS]
function.
Example (requires input configuration—
see page 3–49):
See I/O specs on page 4–6.
5 4 3 2 1 L
PCS
P24
FRS
[FRS]
1
0
Motor speed
t
[FW,RV]
1
0
Zero frequency start
B088 = 00
[FRS]
1
0
Motor speed
t
[FW,RV]
1
0
Resume from motor speed
B088 = 01
B003
Wait time
418
Operations and
Monitoring
4 18
Operations and
Monitoring