Control Circuits-Simplified (for Beginners)

8/13/2019 Control Circuits-Simplified (for Beginners)

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CONTROLCIRCUITS& INTERLOCKS

B CHINNA RAO

GET- ELECTRICAL

MENTORMR. SANJAYTHAKUR


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CONTROL

A broad term that means anything from a simple

toggle switch to a complex system of components

(which may include relays, contactors, timers,

switches, and indicating lights).

Every electrical circuit for light or power has control

elements. One example of a simple control circuit is

a light switch that is used to turn lights on and off


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WHY? WHERE? WHAT?

Motor control, for example, can be used to start and

stop a motor and to protect the motor, associated

machinery, and personnel.

In addition, motor controllers might also be used for

reversing, changing speed, jogging, sequencing,

and pilot-light indication.

Control circuits can be complex, accomplishing high

degrees of automatic, precise machine operation

Manual and Automatic Control


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Contact symbols are used to indicate an open or

closed path of current flow. Contacts are shown as

normally open (NO) or normally closed (NC).

Contacts shown by this symbol require another

device to actuate them.


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Normally Open Normally Closed


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MOTORCONTROLCENTERS(MCCS)

According to the NEMA definition, motor control

centers:

Are floor-mounted assemblies

Have one or more enclosed vertical sections

Have a common horizontal power bus

May incorporate vertical buses connected to the

common bus

Principally contain combination motor control units


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MOTORCONTROLCENTERS(MCCS)

In many commercial and industrial applications

quite a few electric motors are required, and it is

often desirable to control some or all of the motors

from a central location. The apparatus designed for

this function is the motor control center (MCC).

Motor control centers are simply physical groupings

of combination starters in one assembly.


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ADVANTAGESOFUSINGMCCS

Faster and easier installation and wiring

Centralized motor control

Generally less total space is required

Neat, attractive appearance Simplicity in adding special components such as

service entrance switches, load centers, and

transformers

Ease of future modifications, such as increasing thesize of the starters, adding additional starters, or

adding additional vertical sections.


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CRITICALPLANTEQUIPMENT

(PMCC-3004,1-PMCC-3024)

Jockey Pumps

Air Compressors & Auxilliaries

Potable Water Pump

N2 Plant & Auxilliaries

BOG & Auxilliaries

Jetty Transformer

Outdoor & Emergency Lighting Transformer

GTG MCCs

EPABX Supply

FA System


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Battery Chargers (MCR,Substation)

Diesel Firewater Pumps

Siren Motors

Flare Stack Supply

Switchyard Air Compressor

CP System

Hot Water Dosing System


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Incomer 1 Closing Circuit.xlsx



Bus Coupler Closing Circuit.xlsxAuto changeover.xlsx

Incomer 1 Tripping Circuit.xlsx



Bus Coupler Tripping Circuit.xlsx

DG Auto Start Command.xlsx
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Thank You

Control Circuits-Simplified (for Beginners)

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