4
Figure 10.
Quick-close actuator.
Figure 11.
Status of actuator with closing
spring preloaded.
Figure 12.
Quick-close actuator circuit
diagram.
Quick-Close Actuator
When equipped with the quick-close
actuator (Figure 10) the main switch
contacts close in 2.5 to 5 cyc/es after
energizing the closing circuit (compared
to 10 seconds for the standard opera-
tor). However, at least 10 seconds lapse
between an opening and closing opera-
tion to allow the motor operator to
preload the closing springs. The acces-
sory includes a cam-operated cutout
switch to allow the motor to preload the
closing mechanism and a solenoid-
operated latch to release the preloaded
closing mechanism.
With the contacts closed, mechanism
status is the same a shown in Figure 6.
When the opening circuit is energized,
the trip solenoid breaks the latch to col-
lapse the toggle and open the switch
contacts (Figure 7). At the same time,
the closing motor is energized and
drives the crank arm to extend the tog-
gle until it latches and extends both the
opening and closing springs. The clos-
ing mechanism is latched in the pre-
loaded position by the closing solenoid
(Figure 11). When the closing circuit is
energized the closing solenoid releases
the overtoggled mechanism to close the
switch and return the mechanism to the
status shown in Figure 6.
Figure 12 shows the circuit diagram
for a control equipped with the quick-
close feature with the main contacts
open. A close signal energizes the
quick-close coil, closing the main switch
contacts. The selector switch is operat-
ed to the left to disable the quick-close
coil circuit and enable the trip circuit. An
open operation energizes the trip coil,
opening the main switch contacts. The
selector switch is operated to the right
to disable the open circuit and the
cutout switch is operated to the left to
energize the motor. The motor operates
to preload the closing spring. At the
completion of this operation the cam on
the crank ar m operates the cutout
switch to the right to de-energize the
motor.
