Toshiba VF-AS1 instruction manual Operation and application of the auto-restart function

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2)Restarting motor during coasting (Motor speed search function)

￿Motor speed "

F-CC"

ST-CC"

ON" OFF"

ON" OFF"

#￿￿￿=￿: This function operates after the ST-CC terminal connection has been opened first and then connected again.

Title	Function	Adjustment range	Default setting	Setting value
		￿:Disabled
	Auto-restart control	￿:At auto-restart after momentary stop
￿￿￿		￿:When turning ST on or off	￿	￿ or ￿
	selection
		￿: ￿ + ￿
		￿:At start-up

*To restart the inverter in operation panel operation mode, press RUN key after a power failure.

*When ￿￿￿￿ (Number of PG input phases) =￿ (single phase) in PG feedback vector control mode (￿￿=￿, ￿), the inverter may trip (￿￿￿￿: speed error) if the direction of rotation of the motor does not agree with.

*The function (￿￿￿=￿) is activated when ST signal turning on or restart after a momentary power failure. *The function (￿￿￿=￿) is activated when starting each time.

Operation and application of the auto-restart function

• By using retry function ￿￿￿￿ together, auto restart function can be actuated at the time of tripping.	5
Application to a crane or hoist

The crane or hoist may have its load moved downward during the above waiting time from input of the operation starting command to the restart of the motor. To apply the inverter to such machines, therefore, set the auto-restart control mode selection parameter ￿￿￿ to “￿” (Disabled). And avoid using the retry function.

•At restart, it takes several seconds. for the inverter to check to see the number of revolutions of the motor. For this reason, the start-up takes more time than usual.

•When the auto restart function is selected, this function is actuated also at time of activation of motor and at the first operation after the reset of tripping. The operation will restart after the waiting time passes.

•Use this function when operating a system with one motor connected to one inverter. This function may not operate properly in a system configuration with multiple motors connected to one inverter.

#The case that the time of free wheel is longer than the rotor time constant of motor (2 times or more), or the searching speed operation can not be conducted liking required, please set ￿￿￿￿=￿￿

Title

Function

Adjustment range

Default setting

￿￿￿￿￿	Auto-restart mode￿	￿:Enabled	￿￿
		￿: Searching speed method 2￿

Note1: ￿￿￿￿=￿ is only effective for 200V-45kW or less, 400V-75kW or less, 600V-7.5kW or less and 690V-90kW or less.

Note2: If ￿￿￿￿=￿ is set, set the motor constants. (Refer to Section 6.22)

5.18.2Regenerative power ride-through control/Deceleration stop during power failure/Synchronized acceleration/deceleration

￿￿￿: Regenerative power ride-through control

￿￿￿￿: Non-stop control time/Deceleration time during power failure

￿￿￿￿: Synchronized deceleration time

￿￿￿￿: Synchronized acceleration time

￿￿￿￿: Under voltage detection level

￿￿￿￿: Regenerative power ride-through control level

•Function

1)Regenerative power ride-through control: When momentary power failure occurs during operation, this function makes operation continue using the regeneration energy from a motor.

2)Deceleration stop during power failure: When momentary power failure occurs during operation, this function stops the motor quickly compulsorily. A forcible stop is carried out in ￿￿￿￿ (Deceleration time) using the regeneration energy from the motor.

(Deceleration time varies with control.)

After the forced stop, the inverter remains static until you put off the operation command momentarily.

3)Synchronized acceleration/deceleration: When the inverter is used with textile machines, this function stops more than one textile machine simultaneously in the event of a momentary power failure and it prevents the breakage of yarns around bobbins at the recovery from the power failure.

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