Control Circuits-Simplified (for Beginners)
Transcript of 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
Incomer 2 Closing Circuit.xlsx
Incomer 3 Closing Circuit.xlsx
Bus Coupler Closing Circuit.xlsxAuto changeover.xlsx
Incomer 1 Tripping Circuit.xlsx
Incomer 2 Tripping Circuit.xlsx
Incomer 3 Tripping Circuit.xlsx
Bus Coupler Tripping Circuit.xlsx
DG Auto Start Command.xlsx
http://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%201%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%202%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%203%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Bus%20Coupler%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Auto%20changeover.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%201%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%202%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%203%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Bus%20Coupler%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/DG%20Auto%20Start%20Command.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/DG%20Auto%20Start%20Command.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Bus%20Coupler%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%203%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%202%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%201%20Tripping%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Auto%20changeover.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Bus%20Coupler%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%203%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%202%20Closing%20Circuit.xlsxhttp://localhost/var/www/apps/conversion/tmp/scratch_3/Individual/Incomer%201%20Closing%20Circuit.xlsx -
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Thank You