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Title:

Contactor

Description:

Contactor A contactor is a relay with heavy-duty contacts to carry large amounts of current. Available either Normally Open or Normally Closed Full-Voltage Starting ... – PowerPoint PPT presentation

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Title: Contactor


1
Contactor
  • A contactor is a relay with heavy-duty contacts
    to carry large amounts of current.
  • Available either Normally Open or Normally Closed

2
Full-Voltage Starting
T1
T2
T3
Line Terminals
Motor Terminals
Contactors S1, S2, S3
3
Autotransformer Starting
4
Autotransformer Starting (continued)
  • To Start
  • All S contacts CLOSE
  • Line terminals connect to high-side of
    autotransformers. Low-sides of autotransformers
    are connected together.
  • Taps of autotransformers are connected to the
    motor terminals providing lower than line voltage
    for starting.

5
Autotransformer Starting (continued)
  • When motor reaches near-rated speed, S contacts
    are OPENed and the R contacts are CLOSED.
  • Full voltage is now applied to the motor
    terminals.

6
Series Impedance Starting
7
Series Impedance Starting
  • Close S contacts at Start
  • Open S contacts and close R contacts at Run
  • Apply approximately 70 of rated voltage to start
  • Z is usually either Inductive or Resistive
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