Hitachi SJ100 Series Instruction Manual page 117

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.
Zero-frequency start
Motor
speed
Switches
FRS
FW, RV
(Run)
Option Terminal
Function Name
Code Symbol
11 FRS Free-run Stop
C01, C02, C03, C04, C05, C06
Valid for inputs:
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.
Resume from motor speed B88 = 01
B88 = 00
Motor
speed
time
Switches
FRS
FW, RV
(Run)
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:
L
See I/O specs on page 4–5.
SJ100 Inverter
B03 wait time
Description
FW FRS
P24
6 5 4 3 2 1
4–13
time