Restart Functions; Frequency Matching Restart And Frequency Pull-In Restart - Omron MX2 Series User Manual

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Restart Functions

This section describes the restart-related functions and their operations.
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Frequency Matching Restart and Frequency Pull-in Restart

The 3G3MX2-V1 Series Inverter supports two restart methods, which can be selected using the follow-
ing functions.
Functions related to frequency match-
ing restart and frequency pull-in restart
Power Interruption/Undervolt-
age Restart Selection
b001
(P. 7-63)
Overvoltage/Overcurrent
Restart Selection
b008
(P. 7-63)
Reset Restart Selection
C103
(P. 5-45)
Free-run Stop Selection
b088
(P. 5-39)
Frequency matching restart and frequency pull-in restart are both intended to enable the inverter to restart
without stopping the motor in a free-run state. After output is shut off, the Digital Operator displays
until the inverter restarts.
Frequency matching restart
Frequency matching restart causes the inverter to restart by recognizing the frequency from the volt-
age between the motor terminals during free-run stop and adjusting to it. The inverter restarts at 0
Hz if the voltage between the motor terminals is insufficient.
Use this setting if the inverter is in a free-run stop for a few seconds.
Precautions for Correct Use
When a PM motor is controlled in the PM motor mode, frequency matching restart may cause
an overvoltage at high rotation speeds of 120 Hz or higher, or at low rotation speeds under a
low induction voltage.
If an overcurrent is detected, instead of using frequency matching restart, use an external
brake or DC injection braking to stop the motor before restarting.
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Select the restart method after the inverter
shuts off its output.
Select the restart method after the inverter
shuts off its output due to an overvolt-
age/overcurrent.
Restart after Resetting the inverter.
Select the restart method after the free-run
stop input signal is canceled (turned OFF).
FW input
(Forward)
Power
supply
Motor
rotation
speed 0
b003
Description
Free-run
Frequency matching start
7 Other Functions
Default
Unit
data
−
00
−
00
−
00
−
00
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