This document discusses speed control of an induction motor using a PLC. It describes the main components involved, including a variable frequency drive, switched mode power supply, and PLC. It also provides information on ladder logic programming and the basic signal flow within a PLC system from sensor inputs to motor outputs.

1. “PLC BASED SPEED
CONTROL OF INDUCTION
MOTOR”

2. 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 ).

3. VARIABLE FREQUENCY DRIVE ( VFD )
BLOCK DIAGRAM OF VFD RATING OF VFD

4. OPERATION OF VARIABLE FREQUENCY DRIVE
WORKING
Ns = 120 (f/p)
 Rectifier Circuit.
 DC Link.
 Inverter Circuit.
 Control Circuit.

5. 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

6. SWITCHED MODE POWER SUPPLY ( SMPS )
 Definition
 Advantage
 Disadvantage
 Application

7. 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.

8. 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
LAMP
CONTACTOR
PUSHBUTTONS

9. 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

10. HARDWARE PART OF PLC
 Central Processing Unit
 Input Modules
 Output Modules
 Power Supply
 Bus system
 Rack(Rail)

11. COMPONENTS OF PLC
PROCESSOR
POWER
SUPPLY
O
U
T
P
U
T
M
O
D
U
L
E
PROGRAMMING DEVICE
From SENSORS
Pushbuttons,
contactors,
Limit switches,
etc.
Solenoids,
Contactors,
alarms
I
N
P
U
T
M
O
D
U
L
E
TO OUTPUTS

12. MANUFACTURES OF PLC
 Allen Bradley
 Siemens
 Mitsubishi
 Hitachi
 Delta

13. ALLEN BRADLEY PLC

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

15. O:0/7
PLC SIGNAL FLOW
O:0/7
O:1/5
Output Devices
Output Modules
Processor MemoryInput Module
Input Devices
Ladder Program
O:0/7
O:1/5
I:0/6
I:1/4
O:1/5
1/5
I:0/6 SENSORS O:0/7
6
I:1/4
I:0/6
I:1/4
DataInput
Image Table
Output
Image Table

16. S
M
P
S
R1
R2
R3
R4
V
F
D
MCB2MCB1
P
L
C
1PHASE 230 V
3 PHASE 415 V

17. THANKING
YOU