User Manual

1-4 Contactor Product Description
1502-UM051E-EN-P – June 2013
Contactor Operation (cont.) IntelliVAC Control (Series E)
e electrically held vacuum contactor operates as follows:
 • WhentheIntelliVACandIntelliVACPluscontrolmodulesreceiveaclose
command, the contactor coil is energized, the current creates an electromagnet
in the coil.
 • eelectromagnetpullsthearmatureplatetowardsthecoilcore,rotatingthe
sha and causing the actuator plate to move upwards.
 • Astheactuatorplatemoves,itpushestheinsulatorandmovableshaup,clos-
ing the contacts in the vacuum bottle.
 • eIntelliVACandIntelliVACPluscontrolmodulessupplytheclosecurrent
to the coil for approximately 200 milliseconds. Aerward, the coil current is
reduced to a lower hold-in value.
 • WhentheIntelliVACandIntelliVACPluscontrolmoduleshavetheclose
command removed, the coil is de-energized, opening the contactor.
e mechanical latch contactor operates in much the same manner as the electri-
cally held version (see above) with a few exceptions:
 • Oncethecontactorisclosed,aspring-loadedmechanismmovesaroller
against the armature plate to hold it against the electromagnetic core.
 • econtactorcanbeopenedelectricallybyenergizingatripcoil(viaIntel-
liVAC and IntelliVAC Plus 'open' output) which pulls the latch away from the
armature, or by a push button mounted on the power cell door that mechani-
cally releases the contactor.
Insulator
Return Spring
Compression Bolt
Magnet/Coil
Assembly
Actuator Plate
Line Terminal
Vacuum Bottle
Load Terminal
Flexible Bus
Armature Plate
and Shaft
Armature Stop
Return Spring
Figure 1.3 – Vacuum Contactor Operation