Rockwell Automation 1502 Medium Voltage Contactor, 800A (Series D and E) - Manual (Page 8)

1-4 Contactor Product Description
1502-UM051E-EN-P – June 2013
Contactor Operation (cont.) IntelliVAC Control (Series E)
The 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.
• The electromagnet pulls the armature plate towards the coil 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, clos-
ing the contacts in the vacuum bottle.
• The IntelliVAC and IntelliVAC Plus control modules supply the close current
to the coil for approximately 200 milliseconds. Afterward, 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.
The 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.
• The 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