magnetic contactor.ppt

18
Motor Controls Prepared by Sir. Rene A. Sy Amg Skilled Hands Technological Col. Magdalena Campus.

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Page 1: magnetic contactor.ppt

Motor Controls

Prepared by Sir. Rene A. Sy Amg Skilled Hands Technological Col.

Magdalena Campus.

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Magnetic Contactor

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Magnetic Contactor used to control the operation of an electric current a large relay usually, used to switch current to an electric current motor or other high power load

a device uses small control current to energize or de-energize a load. It can handle high amounts of current and also combined w overload relays to create motor starters

electrically controlled switch used for switching a power circuit, similar to relay except with higher amperage ratings.

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Motor controls containsControl Circuit

A circuit contains the control device that will initiate starting or stopping the motor, by the means of the start/stop push button.

Control circuit provides a temporary path for energizing he coil and permanent path through the contact

Delays energization of the coil preselected time to allow switch contact bounce to cease.

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Prevents a reestablishment of the temporary path for preselected time after the contact close

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Power circuit

Power circuit carries the motor load current

supplies the line side of main terminal of the contactor

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Control circuit composed of

1.Overload relay or over load

2.Magnetic contactor/Main terminal

3.Transformer

4.Start stop station

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Symbols

Start switch is normally Close, while the stop is normally close

Magnetic contactor coil or holding coil

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Overload block with heater

3 main contact for 3 phase

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OL

Normally closed overload switch

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Fuse

Circuit breaker

MotorMotor

T1

T2

T33 phase motor

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Contactor markings and label

1

2

3

4

5

6

(European)

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L 1 L2 L3

T1 T2 T3

(R) (S) (T)

(U) (V) (W)

(American)

A1 and A2- for holding coil

95

9698

OL

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Control Circuit Diagram

L1

1 2 3 4

(Self holding)

A1h c

13 14

OL

L2

A295

96

(N.C)(N.O)

StopStart

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Example of Wiring Diagram

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