Toshiba VF-A7 instruction manual Setting signal apart from each

[Message] The following are messages only. No trip is developed.

Indication	Contents	Expected causes	Countermeasures
	ST-CC opened	･ ST terminal is in open-circuit.	･ Close ST-CC circuit.
	Control circuit	･ Undervoltage between RO and	･ Measure supply voltage of control
		SO of control power supply	power. If voltage is normal, it needs
	undervoltage	(when option is used for 22 kW	repair service.
		or lower type).
	Main circuit	･ Undervoltage between R, S and	･ Measure supply voltage of main
		T of main circuit power supply.	circuit power. If voltage is normal, it
	undervoltage	･ Trouble of pre-charge circuit	needs repair service.
		or DC circuit fuse.	･ Make a service call.
		･ In retry operation.	･ If inverter automatically restarts
		･ Momentary power failure is	dozens of seconds later, it is
	Retry indication	occurred.	normal. Be careful of inverter in
			retry status, because there is a fear
			that it may suddenly restart.
	Frequency point	･ Points 1 and 2 of frequency	･ Set points 1 and 2 of frequency
	setting error	setting signal are set too close to	setting signal apart from each
	alarm	each other.	other.
	Clear enabling	･ If STOP key is pressed after trip	･ Press STOP key once more for
	indication	indication, this indication	resetting.
		appears.
	Emergency stop	･ Stop operation is performed by	･ If STOP key is pressed, emergency
	enabling	panel during automatic or	stop is executed. To cancel
		remote operation.	emergency stop, press any other
	indication
			key.
	Alarm for setup	･ Setup value error is detected in	･ Check setup value for input error.
	value error	reading out or writing data.
	(Error indication
/	and data are
	alternately
	displayed twice
	each.)
		･ Under DC braking	･ If message disappears dozens of
	DC braking		seconds later, it is normal. (Note)
		･ Under motor shaft fixing control	･ If message disappears by stop
	indication
			command (ST-CC open), it is
			normal.
		･ Number to be shown on panel	･ For indication of frequency, set
	Panel indication	such as frequency and so on	multiplying rate () lower.
		overflows figures of display.	(Parameter setting that results in
	overflow
		(Number of overflowing digits is	overflow is of course valid.)
		indicated.)
		･ Various transmission errors	･ For countermeasures against
		occur when computer is linked	various transmission errors, refer to
	Communication	up with inverter system.	the "Manual for communication".
		･ Various transmission errors	･ Check the master inverter.
	error	occur in inverter to inverter
		communication (slave side).
		Time-out or trip in master side.
	Parameter is	･ Parameters are initialized to be	･ If message disappears dozens of
	under	standard default values.	seconds later, it is normal.
	initialization.

 In auto-tuning

･Under auto-tuning.

･If message disappears several seconds later, it is normal.

Note: In the case DC injection braking ON/OFF function is selected for an input terminal; if "" disappears as a result of open-circuit between the terminal and CC, it is normal.

[Pre-alarm display]

Indication	Contents	Expected causes and countermeasures
	Overcurrent alarm	Same as  (over-current)
	Overvoltage alarm	Same as  (over-voltage)
	Achieving PBR operation level	P blink while PBR is operating is not an error.
	Overload alarm	Same as  /  (overload)
	Overheat alarm	Same as  (overheat)

When two or more alarms occur at the same time, such the message as shown in the following blinks. , , , ,・・・・・, 

Blinking indications appear in order of , , , from the leftmost place to right.

L-4