Toshiba VF-S9 manual Problem Possible causes Remedies Small-current opera

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Error code	Communication	Problem		Possible causes			Remedies
	No.
*	1D	Small-current opera-	• The output current falls to the low-current		•	Enable	(low-current detection pa-
		tion trip		detection level during operation.		rameter).
					• Check whether the detection level is set
						properly to the system.
						( and	)
					• If no error is found in the setting, make a
						service call.
	22h	Ground fault trip	• A ground fault occurs in the output cable		• Check the cable and the motor for ground
				or the motor.		faults.
	11h	Emergency stop	• During automatic operation or remote op-		•	Reset the inverter.
				eration, a stop command is entered from
				the operation panel or a remote input de-
				vice.
	15h	Main unit RAM fault	•	The control RAM is defective.	• Make a service call.
	16h	Main unit ROM fault	•	The control ROM is defective.	• Make a service call.
	17h	CPU fault trip	•	The control CPU is defective.	• Make a service call.
	18h	Remote control error	• An error arises during remote operation.		• Check the remote control device, cables,
						etc.
	29h	Inverter type error	• The control circuit board (main circuit		• Make a service call.
				board or drive circuit board) is replaced.
	12h	EEPROM fault	• A data writing error occurs.		• Turn off the inverter, then turn it on again.
						If it does not recover from the error, make
						a service call.
	28h	Auto-tuning error	• Check the settings of the motor parameters			to	.
			• Check that the motor is not two or more sizes smaller in capacity than the inverter.
			• Check that the inverter output cable is not too thin.
			• Check that the motor is not running.
			• Check that the motor is a three-phase inductive motor.

*With a parameter, you can choose between trip-on and -off.

[Alarm information] Each message in the table is displayed to give a warning but does not cause the inverter to trip.

Error code	Problem	Possible causes	Remedies
(Note 1)	ST terminal OFF	• The ST-CC circuit is opened.	• Close the ST-CC circuit.
	Undervoltage in main	• The supply voltage between R, S and T is	• Measure the main circuit supply voltage.
	circuit	under voltage.	If the voltage is at a normal level, the
			inverter requires repairing.
	Retry in process	• The inverter is in the process of retry.	• The inverter is normal if it restarts after
		• A momentary stop occurred.	several tens of seconds.
			The inverter restarts automatically. Be
			careful of the machine because it may
			suddenly restart.
	Frequency point set-	• The frequency setting signals at points 1	• Set the frequency setting signals at points
	ting error	and 2 are set too close to each other.	1 and 2 apart from each other.
	Clear command ac-	• This message is displayed when pressing	• Press the STOP key again to clear the
	ceptable	the STOP key while an error code is dis-	trip.
				13
		played.
	Emergency stop	• The operation panel is used to stop the	• Press the STOP key for an emergency
	command accept-	operation in automatic control or remote	stop.
	able	control mode.	To cancel the emergency stop, press any
			other key.
	Setting error alarm /	• An error is found in a setting when data is	• Check whether the setting is made cor-
	An error code and	reading or writing.	rectly.
	data are displayed
	alternately twice
	each.

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