“PLC BASED SPEED CONTROL OF INDUCTION MOTOR”

COMPONENT OF SPEED CONTROL OF IM BY PLC

Miniature Circuit Breaker ( MCB ). Relay ( R ). Bus Bar ( BB ). Variable Frequency Drive ( VFD ). Switched Mode Power Supply ( SMPS ). Programmable Logic Controller (PLC). Induction Motor ( IM ).

VARIABLE FREQUENCY DRIVE ( VFD )

BLOCK DIAGRAM OF VFD RATING OF VFD

OPERATION OF VARIABLE FREQUENCY DRIVE

WORKING Ns = 120 (f/p) Rectifier Circuit. DC Link. Inverter Circuit. Control Circuit.

SWITCHED MODE POWER SUPPLY ( SMPS )

INPUT Voltage = 100-240 AC Frequency = 50-60 Hz Current = 0.6-1.5 Amp Operational Voltage 85-264 /90-350 AC OUTPUT Voltage = 24 DC Current = 5Amp

SWITCHED MODE POWER SUPPLY ( SMPS )

Definition Advantage Disadvantage Application

HISTORY OF PLC The Hydromantic Division of the General Motors Corporation Specified the design criteria for the first programmable controller in 1968. Their primary goal was to eliminate the high costs

associated with inflexible, relay-controlled systems.

PROGRAMMABLE LOGIC CONTROLLER (PLC)

PLC is programmed interface between input sensors &output devices.

The PLC is an assembly of solid state digital logic elements design to make logical decisions and provide outputs.

PLC

INPUTS

LAMPCONTACTOR

PUSHBUTTONS

TYPES OF PLC Compact PLC – inbuilt power supply, processor, i/o’s Modular PLC- separate power supply, processor, i/o’s

From Size Small-64 I/O’S Medium - 1024 Large - 4096

HARDWARE PART OF PLC

Central Processing Unit Input Modules Output Modules Power Supply Bus system Rack(Rail)

COMPONENTS OF PLC

PROCESSOR

POWERSUPPLY

OUTPUTMODULE

PROGRAMMING DEVICE

From SENSORS

Pushbuttons,contactors,

Limit switches,etc.

Solenoids,Contactors,

alarms

INPUTMODULE

TO OUTPUTS

MANUFACTURES OF PLC Allen Bradley Siemens Mitsubishi Hitachi Delta

ALLEN BRADLEY PLC

PROGRAMMING LANGUAGES OF PLC Ladder Logic ( LAD/LD ) Structured Text ( ST) Instruction List ( IL ) Sequential Function Chart ( SFC ) Function Block Diagram ( FBD )

O:0/7

PLC SIGNAL FLOW

O:0/7

O:1/5

Output Devices

Output ModulesProcessor MemoryInput Module

Input DevicesLadder Program

O:0/7

O:1/5

I:0/6

I:1/4

O:1/51/5

I:0/6 SENSORS O:0/7

6I:1/4

I:0/6

I:1/4

Data InputImage Table

OutputImage Table

SMPS

R1

R2

R3

R4

VFD

MCB2MCB1

PLC

1PHASE 230 V

3 PHASE 415 V

THANKING YOU