Toshiba VF-AS1 instruction manual Emergency stop Emergency DC braking control time, +Su

E6581301

Be sure to select this setting if the main power supply is turned on and off endlessly for reasons of sequence, as shown below, in the event the control power supply backup device fails or not connected.

In case of

3 φ - 200~240V -50/60Hz!

Control power supply backup device (option)

MC

R/L1

S/L2

T/L3

+SU

CC

FLA

RUN

MC

FLB

FLC

RUN

<Example of a situation in which the main power supply is turned on and off endlessly>

In the example of connection shown above, if the control power supply 4backup device (optional) fails or not connected and becomes incapable of supplying control power, control power is supplied from the inverter’s main circuit and operation is continued without interruption. If the inverter is tripped under these circumstances because of a ground fault or overcurrent :

(1)	The FL relay is triggered and the main power supply is shut off by the MC.
	↓
(2) As a result of shutoff by the MC, the voltage in the inverter’s main circuit and control circuit drop.
		6
	↓
(3) As a result of a drop in control voltage, the FL relay recovers from a trip.
	↓
(4)	The release of the FL relay turns the MC back on.
	↓

(5)Operation is restarted and if the problem causing the inverter to be tripped is not eliminated, the inverter is tripped again, the situation in (1) arises again, and thus the above cycle of operation is repeated endlessly.

6.33.3Emergency stop!

￿￿￿￿

￿￿￿￿

:Emergency stop

:Emergency DC braking control time

• Function

Emergency stop mode can be selected. At emergency stop, a trip message (“￿”) is displayed. FL relay can

be deactivated using the output function selection.

1)Emergency stop by terminal operation

Emergency stop can be performed with the a or b-contact. Assign the emergency stop function to a terminal as described below, and select a stop mode.

Input terminal

CC

a-contact

Input terminal

CC

b-contact!

2) Emergency stop

￿￿￿￿=￿: The motor is brought to a stop within the time specified with selected deceleration time.

￿￿￿￿=￿: DC braking is performed at the current specified with ￿￿￿￿ (DC braking current) for the time specified with ￿￿￿￿ (emergency DC braking control time).

￿￿￿￿=￿: The motor is brought to a stop within the time specified with ￿￿￿￿ (deceleration time 4). Use this setting to bring the motor to a stop within time different from the normal deceleration time specified with ￿￿￿.

F-59