Toshiba VF-AS1 instruction manual Trip-less intensification

E6581301

6.14Trip-less intensification

6.14.1Retry function!

￿￿￿￿

: Retry selection (selecting the no. of retry attempts)

Warning

Mandatory

•Stand clear of motors and equipment.

The motor and equipment stop when the alarm is given, selection of the retry function will restart them suddenly after the specified time has elapsed. This could result in unexpected injury.

•Take measures for safety, e.g. attach a cover to the motor, to prevent accidents if the motor suddenly restarts.

• Function

This parameter resets the inverter automatically when the inverter gives a trip. During the retry mode, the motor speed search function operated automatically as required and thus allows smooth motor restarting.

	[Parameter setting]
		Title		Function			Adjustment range	Default setting
		￿￿￿￿￿	Retry selection (selecting the no. of retry			￿: Deselect, ￿~￿￿ times		￿
			attempts)
	The likely causes of tripping and the corresponding retry processes are listed below.
		Cause of tripping			Retry process		Canceling conditions
				Up to 10 times in succession			The retry function will be canceled at once
		Momentary power failure		1st retry	: About 1 sec after tripping		if tripping is caused by!an unusual event
6		Overcurrent		2nd retry	: About 2 sec after tripping		other than tripping which can be retried
		Overvoltage		3rd retry	: About 3 sec after tripping		This function will also be canceled if a
		Overload			...		retry is not successful within the specified
				10th retry : About 10 sec. after tripping			number of times.

Trips covered by the retry function

	• ￿￿￿, ￿, ￿	: Overcurrent	• ￿￿￿: Inverter overload		• ￿￿ : Overheat
	• ￿￿￿￿, ￿￿, ￿￿: Overcurrent in DC section or		• ￿￿￿: Motor overload		• ￿￿￿￿: PM motor step-out
		overheating of devices	• ￿￿￿: Braking resistor
	• ￿￿￿, ￿, ￿	: Overvoltage	overload
"The retry function is disabled in the following unusual events:
	• ￿￿￿￿, ￿, ￿￿: Arm overcurrent at start-up		• ￿￿￿￿, ￿, ￿￿: EEPROM error
	• ￿￿￿￿￿	: Input phase failure	• ￿￿￿￿￿ : Main RAM error
	• ￿￿￿￿￿	: Output phase failure	• ￿￿￿￿￿ : Main ROM error
	• ￿￿￿￿	: Loaded side overcurrent at start time	• ￿￿￿￿￿	: CPU trip
	• ￿￿￿￿	: External thermal error￿	• ￿￿￿￿￿ : Interruption of operation command from
	• ￿￿￿	: Low current￿		external control device￿
	• ￿￿￿￿	: Voltage drop in main circuit￿	• ￿￿￿￿￿	: Gate array fault￿
	• ￿￿￿	: Overtorque	• ￿￿￿￿￿ : Output current detector error￿
	• ￿￿￿, ￿￿￿￿: Ground fault		• ￿￿￿￿￿	: Optional unit error
	• ￿￿	: Emergency stop	• ￿￿￿￿~￿￿
			• Others (Other than trips covered by the retry function)

"Protective operation detection relay signals (FLA, FLB, FLC terminal signals) are not sent during use of the retry function. (factory default setting)

"A virtual cooling time is provided for overload tripping (￿￿￿, ￿￿￿, ￿￿￿).

￿See Section 13.2 for the virtual cooling time.

In this case, the retry function operates after the virtual cooling time and retry time.

"In the event of overvoltage tripping (￿￿￿~￿￿￿), re-tripping may result unless the DC voltage decreases below a predetermined level.

"In the event of overheating-caused tripping (￿￿), re-tripping may result unless the internal temperature decreases below a predetermined level, since the internal temperature detection function of the inverter works.

"Even when trip retention selection parameter (￿￿￿￿) is set to ￿, the retry function is enabled by ￿￿￿￿ setting. "During retry the blinking display will alternate between ￿￿￿￿ and the monitor display specified by parameter

monitor display selection parameter ￿￿￿￿.

F-24