Free-Run Stop - Hitachi L300P Series Instruction Manual

Free-run Stop

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
Motor
speed
Switches
FRS
[FW, RV]
Valid for
inputs:
Required
settings:
Notes:
• When you want the [FRS] terminal to be
B088=00
Zero-frequency start
Opt.
Symbol Function Name
Code
11 FRS Free-run Stop
C001, C002, C003, C004,
C005
B003, B088, C011 to C015
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.
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: (Requires input configuration—
see page 3–43. Jumper position shown is
for –xFU/-xFR models; for –xFE models,
see page 4–11.)
TH FW
P24 PLC CM1
See I/O specs on page 4–8.
4–19
L300P Inverter
B088=01
wait time
B003
t
Description
FRS
5 4 3 2 1