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:
r 8IFOUIF*OUFMMJ7"$BOE*OUFMMJ7"$1MVTDPOUSPMNPEVMFTSFDFJWFBDMPTF
command, the contactor coil is energized, the current creates an electromagnet
in the coil.
r ăFFMFDUSPNBHOFUQVMMTUIFBSNBUVSFQMBUFUPXBSETUIFDPJMDPSFSPUBUJOHUIF
shaft and causing the actuator plate to move upwards.
r "TUIFBDUVBUPSQMBUFNPWFTJUQVTIFTUIFJOTVMBUPSBOENPWBCMFTIBĕVQDMPT
-
ing the contacts in the vacuum bottle.
r ăF*OUFMMJ7"$BOE*OUFMMJ7"$1MVTDPOUSPMNPEVMFTTVQQMZUIFDMPTFDVSSFOU
to the coil for approximately 200 milliseconds. Afterward, the coil current is
reduced to a lower hold-in value.
r 8IFOUIF*OUFMMJ7"$BOE*OUFMMJ7"$1MVTDPOUSPMNPEVMFTIBWFUIFDMPTF
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:
r 0ODFUIFDPOUBDUPSJTDMPTFEBTQSJOHMPBEFENFDIBOJTNNPWFTBSPMMFS
against the armature plate to hold it against the electromagnetic core.
r ăFDPOUBDUPSDBOCFPQFOFEFMFDUSJDBMMZCZFOFSHJ[JOHBUSJQDPJM WJB*OUFM
-
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
