User Manual

Rockwell Automation Publication 1502-UM052H-EN-P - June 2013 7
Product Description Chapter 1
Figure 3 - Vacuum Contactor Operation
Mechanically Latched
Contactor Operation
The mechanically latched contactor operates in much the same way as the
electrically held (Figure 3
) with only a few exceptions.
IntelliVAC and IntelliVAC Plus Control
Once the contactor is closed, a spring-loaded mechanism moves a roller
against the armature plate to hold it against the electromagnetic core.
The contactor can be opened electrically by energizing a trip coil (via
IntelliVAC or IntelliVAC Plus ‘open’ [TCO] output) which pulls the
latch away from the armature, or by a push button mounted on the power
cell door that mechanically releases the contactor.
Electromechanical Control
When the control circuit is energized, the current creates an electromagnet
in the closing coil.
The electromagnet pulls the armature plate towards the coils’ core,
rotating the shaft and causing the actuator plate to move upwards.
As the actuator plate moves, it pushes the insulator and movable shaft up,
closing the contacts in the vacuum bottle.
Once the contactor is closed, a spring-loaded mechanism moves a roller
against the armature plate to hold it against the electromagnetic core.
The control circuit economizing auxiliary contact, on the left side of the
contactor, changes from the normally closed state to the normally open
state as the contactor closes. This de-energizes the relay that controls the
closing coils.
Insulator
Armature Plate & Shaft
Auxiliary Actuator
Armature Stop Bracket
Control Wire Plug
Line Terminal
Vacuum Bottle
Load Terminal
Flexible Bus
Return Spring
Actuator Plate
Gap Adjustment Screw
Magnet/Coil Assembly
C.P.T. Fuse Clip
Contactor Open
Contactor Closed