Hitachi SJ300 Series Signal, Instantaneous, Power Failure, Under-voltage, Code, Function, conditions, conditions, Description, Under-voltage, Data or Range, Over-current/voltage

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SJ300 Inverter

InstantaneousPower Failure /Under-voltage

Signal

An instantaneous power failure (complete loss) or under-voltage condition (partial loss) of inverter input voltage can occur without warning. SJ300 Series inverters can be configured to respond to these conditions in different ways. You can select whether the inverter trips or retries (restart attempt) when an instantaneous power failure or under-voltage condition occurs. You can select the retry function with parameter B001.

When enabled, the Retry Function operates in the following ways:

•Under-voltage conditions – When an instantaneous power failure or under-voltage condi- tion occurs, the inverter will attempt to restart up to 16 times. A trip condition will occur on the 17th attempt, which must be cleared with the Stop/Reset key.

•Over-current/voltage conditions – When retry function is selected and an over-current or an over-voltage condition occurs, a restart is attempted 3 times. A trip will occur on the 4th failed restart attempt. Use parameter B004 to select the trip and alarm response to instanta- neous power failure and under-voltage conditions. The following table shows the related parameters to these power fault conditions, and timing diagrams are on the next page.

Code	Function	Data or Range	Description
B001	Selection of	00	Alarm output after trip, automatic
	automatic restart		restart disabled
	mode
		01	Restart at 0 Hz
		02	Retry with frequency matching to
			present motor speed
		03	Retry with frequency matching
			followed by deceleration to stop—
			then trip alarm
B002	Allowable under-	0.3 to 1.0 sec.	The amount of time a power input
	voltage power failure		under-voltage can occur without
	time		tripping the power failure alarm. If
			under-voltage exists longer than this
			time, the inverter trips, even if the
			restart mode is selected. If it exists
			less than this time retry will be
			attempted.
B003	Retry wait time	0.3 to 100 sec.	Time delay after a trip condition goes
	before motor restart		away before the inverter restarts the
			motor
B004	Instantaneous power	00	Disable
	failure / voltage trip
		01	Enable
	alarm enable
		02	Disable during stop and ramp to stop
B005	Number of restarts	00	Restart up to 16 times on instanta-
	on power failure /		neous power failure or under-voltage
	under-voltage trip
		01	Always restart on instantaneous
	events
			power failure or an under-voltage
			condition
B007	Restart frequency	0.00 to 400.0 Hz	When frequency of the motor is less
	threshold		than this value, the inverter will
			restart at 0 Hz

Operations Monitoring and