Toshiba VF-A7 instruction manual , , , , Timing chart, 

[Parameter setting]

Title	Function	Adjustment range	Default setting
	Output signal selection of	: OFF
		: Automatic switching in case of trip
 commercial power/inverter		: Commercial power switching frequency setting	
	switching	enabled
		: Both ( + )
	Commercial power/inverter	～ [Hz]	
	switching frequency
	Inverter side switching	[Model dependent]～ [s]	Model
	waiting time		dependent
	Commercial power side	～ [s]	
	switching waiting time
	Commercial power switching	～ [s]	
	frequency holding time

(*1)The trips which is followed by automatic switching are trips other than , ,  and .

[Timing chart]

Commercial power/inverter switching frequency 

Frequency Reference

MC output for inverter operation Commercial power/inv. Switching output１(P24-OUT1)

MC output for commercial power operation Commercial power/inv. switching output２(P24-OUT2)

Commercial power switching signal (S3-CC)

ST (standby) signal

(ST-CC)

Commercial power switching freq. holding time 

ON

Commercial power side switching waiting time 

ON

ON

ON

Detecting time

Inverter side switching waiting time 

ON

Commercial power switching signal S3-CC ON：Commercial power operation

Commercial power switching signal S3-CC OFF：Inverter operation Note) If ST-CC is opened,switching cannot be operated normally.

Title	Function	Adjustment range	Setting value
	Output signal selection of	～	 or 
	commercial power/inverter switching
	frequencyCommercial power/inverter switching	～ [Hz]	Power source frequency, etc.
	Inverter side switching waiting time	[Model dependent]	Model dependent
		～ [s]
	Commercial power side switching	～ [s]	
	waiting time
	Commercial power switching	～ [s]	
	frequency holding time
	Input terminal selection #7 (S3)	～	: (Commercial power
			/inverter switching)
	Output terminal selection #1 (OUT1)	～	: (Commercial power
			/inverter switching output #1)
	Output terminal selection #2 (OUT2)	～	: (Commercial power
			/inverter switching output #2)

Caution!

･Before switching to the commercial power, make sure that, when the motor takes power directly from the commercial power, it rotates in the forward direction as defined for operation by the inverter.

･Do not set the Reverse-run prohibition parameter  at  or  that forward run may be prohibited. These settings make it impossible to switch the inverter to the forward run position, and thus to switch from the inverter to the commercial power.

F-33