Toshiba VF-AS1 Protection functions, Setting of stall prevention level Stall prevention level

E6581301

6.33Protection functions

6.33.1Setting of stall prevention level

￿￿￿￿

: Stall prevention level

Warning

Prohibited

•Do not set the stall prevention level (￿￿￿￿) extremely low.

If the stall prevention level parameter (￿￿￿￿) is set at or below the no-load current of the motor, the stall preventive function will be always active and increase the frequency when it judges that regenerative braking is taking place.￿

Do not set the stall prevention level parameter (￿￿￿￿) below 30% under normal use conditions.

• Function

This parameter reduces the output frequency by activating a current stall prevention function against a current exceeding the ￿￿￿￿-specified level.

[Parameter setting]

Title	Function	Adjustment range	Default setting
￿￿￿￿￿	Stall prevention level	￿~￿￿￿ %, ￿￿￿:Deactivated	￿￿￿￿

[Display during the alarm ￿￿]
During an ￿￿ alarm status, (that is, when there is a current flow in excess of the stall prevention level), the output
frequency changes. At the same time, to the left of this value, “￿” is displayed flashing on and off.
6	￿ ￿￿￿
Example of display

6.33.2 Inverter trip record retention!

￿￿￿￿

: Inverter trip record retention selection

• Function

If the inverter trips, this parameter will retain the corresponding trip information. Trip information that has thus been stored into memory can be displayed, even after power has been reset.

[Parameter setting]

Title	Function	Adjustment range	Default setting
￿￿￿￿￿	Inverter trip record retention selection	￿:Clear when power is turned off.	￿￿
		￿:Retain even after power is turned off.

★Up to four sets of latest trip records displayed in status monitor mode can be stored into memory.

★Data (current, voltage, etc.) displayed in status monitor mode when the inverter is tripped is cleared when power is turned off.

■Flow of operation when ￿￿￿￿=￿

	Operation panel	Retention of failure	Ready for normal
	(terminal) reset !	records is also canceled.	operation
Inverter trip
	Power supply reset	Turn on power again!	Trip again!
		Fault display!	Fault display!
		FL not active	FL active

If the cause of tripping or that of another failure is not yet removed.

F-58