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7 Advanced Settings
High-function General-purpose Inverter RX2 Series User’s Manual
7-5 Start Conditions
7
7-5-3 Frequency Matching Start
Frequency matching start is activated if you set the function that an inverter runs by picking up fre-
quency while a motor is idling due to a trip or terminal function.
Obtain the cycle of the motor residual voltage to start operation.
Frequency matching lower limit setting [bb-42] is the parameter common to frequency matching func-
tions.
Precautions for Correct Use
• Even if frequency matching restart is selected, the inverter may restart with 0 Hz if:
1. the output frequency is equal to or lower than 1/2 of the base frequency,
2. the voltage induced on the induction motor quickly attenuates, or
3. the frequency matching lower limit setting [bb-42] is set and the inverter detects a fre-
quency equal to or lower than that.
• If the restart after free-run stop or the restart after reset is performed, the inverter will restart
after the retry wait time after instantaneous power failure/under-voltage has elapsed.
• The restart after free-run stop and the restart after reset will be performed if the operation
command is continuously input via a terminal command or other ways.
• If the frequency matching restart does not go well because the residual voltage rapidly
decreases or for other reasons, it may go well by using the frequency pull-in restart. See
7-5-4 Frequency Pull-in Start on page 7-69.
(Ex.1) The motor speed is equal to or more than the frequency matching lower limit setting.
(Ex.2) The motor speed is equal to or lower than the frequency matching lower limit setting
7-5-3 Frequency Matching Start
Free-running
Restarting with frequency matching
Retry wait time
Power failure
factor
Inverter output
Motor speed
Lower limit
setting
Free-running
Restart with 0 Hz
Retry wait time
Power failure
factor
Inverter output
Motor speed
Lower limit
setting
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