Toshiba VF-A7 instruction manual Presence or absence of parameter trip can be selected

(Continued from the preceding page)

Indication	Contents	Expected causes	Countermeasures
		･ Input voltage (main circuit)	･ Check input voltage.
		becomes insufficient in operation.	･ If undervoltage is detected, set
(*1)	Under-voltage	･ Momentary power failure occurs	 (regenerative power ride-
	(main circuit)	because undervoltage continues	through control),  (auto-restart)
		longer than under-voltage	and  (under-voltage detection
		detection time .	time) as countermeasures against
			future momentary power failure.
		･ Input voltage (control circuit)	･ Check input voltage.
		becomes insufficient in operation.	･ If undervoltage is detected, set
(*1)	Under-voltage	･ Momentary power failure occurs	 (regenerative power ride-
	(control circuit)	because undervoltage continues	through control),  (auto-restart)
		longer than under-voltage	and  (under-voltage detection
		detection time .	time) as countermeasures against
			future momentary power failure.
(*1)	Over-torque	･ Load torque reaches over-torque	･ Check the system if there is
		detection level in operation.	something abnormal in it or not.
	Ground-fault	･ Output cable or motor falls into	･ Check units and connections if there
		ground-fault.	is ground-fault or not.
		･ Check settings of to 	parameters for motor.
		･ Motor whose capacity is smaller by two or more ranks than that of inverter
	Auto-tuning	is used, isn't it?
		･ Extremely think cable is used as inverter output cable, isn't it?
	error	･ Motor is running, isn't it?
		･ Motor other than three-phase inductive type is used, isn't it?
		･ If  error occurs as power is turned on, set motor type parameter as
		 =  (others).
	Inverter type	･ Is control board (or drive board of	･ When board has been replaced, input
	error	main circuit) replaced?	 for .
		･ Sink/source switch of	･ Check connections and set proper
		input/output terminal is set wrong	logic.
		(reversely switched on/off).	･ After making sure that sequence is
	Sink/source		normal, proceed in operation.
			･ If the same error does not occur when
	switching error		the power is turned on again, the
			system has recovered normal status.
			(Check control terminals and
			sink/source switches including those
			of add-on options.)
		･ The signal from a system is not	･ Please check if the sequence is
		inputted into input terminals.	normal or not.
		･ The input terminal function (	･ Please set or  as the input
	Sequence error	or ) is not set up.	terminal to use.
		･ For not using the system-	･ Please set up 0.0, when you do not
		supporting sequence 	use system-supporting sequence.
		function, it is set up except 0.0 at
		.
	Encoder error	･ Disconnection of encoder circuit.	･ Check connection of encoder.
			Connect encoder correctly.
	Speed error	･ Something abnormal in encoder	･ Check connection of encoder.
	(Over speed)	(inverter)	Connect encoder correctly.
	To much	･ Potential deviation exceeded the	･ Check connection of encoder.
		 set value during position	･ Increase the setting value of .
	potential
		control.	･ Adjust the parameters on position
	deviation
			control
	Key error	･ RUN or STOP key is depressed	･ Check operation panel.
		for 5 seconds or more.
		･ Key is faulty.
	VI/II input error	･ Breaking down of a wire for VI/II	･ Check VI/II input signal
		input signal.
		･ Connection between the inverter	･ Check connection between the inverter
		and optional add-on cassettes is	and optional add-on cassettes. If it is
	Read-error	abnormal.	not reset, make a service call.
～		･ Something abnormal in control	･ Make a service call.
		signal.

Presence or absence of parameter trip can be selected.

(Note) Please contact us if you find any trips other than the above.

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