Stop Method Settings; Stop Selection; Free-Run Stop Selection - Omron RX Series User Manual

5-7

Stop Method Settings

5-7-1

Stop Selection

• Select whether the motor is stopped by a deceleration stop according to the deceleration time setting
or a free-run stop, when the STOP command is input via the Digital Operator or the control circuit
terminal block.
• If the RUN command is input again during free run, the inverter will restart according to the Free-run
Stop Selection (b088) setting.
Parameter
No.
b091

Stop Selection

5-7-2

Free-run Stop Selection

• Free-run stop is a method of shutting off the inverter output to stop the motor rotation.
Executing the free-run stop function causes the motor to fall a free-run state, in which it decelerates
due to the load and friction forces exerted on the motor and/or machine and comes to a stop.
• In the Free-run Stop Selection (b088), set how to restart the motor rotating in a free-run state after
the execution of the free-run stop.
• The Free-run Stop Selection (b088) setting is enabled for the following cases.
When Stop Selection (b091) is set to 01 (Free-run stop)
Restarting the motor in a free-run stop state when the When Stop Selection (b091) is set to 01
(Free-run stop) causes the motor to restart according to the Free-run Stop Selection (b088)
setting.
When free-run stop (FRS) function is used via a multi-function input terminal
Setting the Multi-function Input S1 to S8 Selection (C001 to C008) to 11 (FRS) and turning ON
the corresponding input terminal causes the motor to fall in a free-run stop state (with the inverter
output shut off).
Then, when the FRS terminal turns OFF, the motor restarts according to the Free-run Stop
Selection (b088) setting.
However, the motor does not restart when the RUN Command Selection (A002) is set to 02
(Digital Operator).
• Set the Free-run Stop Selection (b088) as follows.
00: 0-Hz restart
Forces the inverter to restart at 0 Hz. Note that the inverter restarts suddenly while in a free-run
state. Use this setting if the motor stops shortly due to the load.
01: Frequency matching restart
Causes the inverter to restart by recognizing the frequency from the voltage between the motor
terminals during free-run stop and adjusting to it. The inverter restarts at 0 Hz if it cannot fully
recognize the voltage between the motor terminals.
Use this setting if the inverter is in a free-run stop for a few seconds.
02: Frequency pull-in restart
Causes the inverter to restart by outputting the starting frequency set in the Starting Frequency
Selection at Frequency Pull-in Restart (b030) to the motor in a free-run stop state and
re-accelerating when the Frequency Pull-in Restart Level (b028) is reached.
High-function General-purpose Inverter 3G3RX-V1 User's Manual (I578-E1)
Function name
00: Deceleration stop
01: Free-run stop
5 Basic Settings
Default
Data
data
00
Unit
–
5
5 - 43