Toshiba VF-A7 Action at low currents, Detection of output phase failure, Over-torque trip

6.25.7 Action at low currents

 ：Low-current trip

 ：Low-current detection level

 ：Low-current detection time

・Function

If the current is lower than  level and passes for a time longer than , the inverter trips. When  is set at (tripping disabled), it is necessary to set, with , the time elapsed before the inverter trips after the detection of a small current.

＝：Disabled・・・・・not trip(FL is not active)

Low-current alarm can be output by output terminal selection.

＝：Enabled・・・・・The inverter trips if low-current passes during operation for

the time set with  or over.(FL is active)

Title	Function	Adjustment range	Default setting
	Low-current trip	: Disabled, : Enabled	
	Low-current detection level	～ [%]	
	Low-current detection time	～ [s]	

6.25.8 Detection of output phase failure

 ：Detection of output short-circuit during start-up

 ：Adjustment of detection pulse for output short-circuit during start-up

・Function

The function is to detect short circuits with inverter's output terminals.

Title		Function	Adjustment range	Default setting
	Detection of output short-		: Standard
			: Only one time at power injection or at	
	circuit during start-up
			first start after reset
	Adjustment of detection pulse		～ [μs]
	for output	short-circuit during		
	start-up

 ・・・ : Standard―――detecting at starting

： A check is made once at the first start of operation after the power is turned on or the inverter is reset.

 ・・・ Set the pulse length for the detection of short circuits.

Note) Shorten the pulse length if the motor trips in error (OCL) at start-up, especially a high-speed motor.

6.25.9 Over-torque trip

 ：Over-torque trip

 ：Over-torque detection level during power running

 ：Over-torque detection level during regeneration

 ：Over-torque detection time

・Function

If a torque current exceeding the current set with ,  is detected, the inverter trips and the trip message “” is displayed.

F-59