Omron MX2 Series User Manual page 222

5 Basic Settings
(Example 1) Frequency matching restart
When the Restart Standby Time (b003) elapses, the inverter detects the motor frequency
and executes the frequency matching restart function without stopping the motor rotation.
If an overcurrent trip occurs during a frequency matching restart, increase the restart
standby time.
Even when the Free-run Stop Selection is set to 01 (Frequency matching start), the
inverter may restart at 0 Hz in the following cases.
• The motor rotation speed is equal to or lower than 1/2 of the base frequency.
• The motor induction voltage decays quickly and the motor rotation speed cannot be
detected.
• The inverter recognizes that the detected frequency is equal to or less than the value set
in the Frequency Matching Lower Limit Frequency (b007).
(Example 2) Frequency pull-in restart
When the set Restart Standby Time (b003) elapses, the inverter starts output at the fre-
quency set in the Starting Frequency Selection at Frequency Pull-in Restart (b030).
Then, the inverter decelerates the motor according to the Frequency Pull-in Restart
Parameter (b029) setting, while suppressing the output current to the value set in the Fre-
quency Pull-in Restart Level (b028).
When the current decreases to or below the Frequency Pull-in Restart Level (b028), the
inverter accelerates again to return to the original frequency.
If this method causes an overcurrent trip, decrease the value set in the Frequency Pull-in
Restart Level (b028).
Additional Information
If the reset signal is input during the restart standby time, the "frequency at shutoff" data stored
in the inverter will be cleared, as a result the inverter restarts from 0 Hz after the reset is cleared.
5 - 46
FW
RS input
Motor
rotation
0
speed
FW input
(Forward)
RS input
(Reset)
Trip occurs.
Output current
Inverter output
frequency
Motor rotation
speed
Multi-function Compact Inverter 3G3MX2-V1 User's Manual (I585-E1)
Free-run
b003
Frequency matching start
Decelerates according to b029
Frequency selected
in b030
b003
b028