SJ100 Inverter
Operations
and Monitoring
4–13
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 B88 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 which is the best setting.
Parameter B03 specifies a delay time before resuming operation from a free-run stop. To
disable this feature, use a zero delay time.
time
FRS
Switches
Motor
speed
FW, RV
(Run)
Zero-frequency start
B88 = 00
time
FRS
Switches
Motor
speed
FW, RV
(Run)
Resume from motor speed
B88 = 01
B03
wait time
Option
Code
Terminal
Symbol
Function Name
Input
State
Description
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:
C01, C02, C03, C04, C05, C06
Required settings:
B03, B88, C11 to C16
Notes:
•
When you want the [FRS] terminal to be active low
(normally closed logic), change the setting (C11 to
C16) which corresponds to the input (C01 to C06)
that is assigned the [FRS] function.
P24
1236 45L
Example:
FW
FRS
See I/O specs on page 4–5.
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