PLC based load managment
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Transcript of PLC based load managment
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PLC Based Load Management
Guidance By:
Dinesh Saini
Asst. Professor,
Electrical Department, BKBIET
Presented By:
Manish Kumar
11EBKEX028
Divya Saini
11EBKEX016
Aishwarya
11EBKEX002
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Content
Introduction about Load management Block diagram of Load Management About PLC Programming in PLC(Ladder logic) Advantage and short-comings
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What is Load Management ?
Load Management is the "proper management of load“ which means balancing the electrical power supply with the variations in the load and its behavior. As we all know that there are generation stations connected in parallel to each other to ensure continuous supply of power to the load. In the LOAD Management, there are contactors and the closing / opening of these Contactors maintain the Load management.
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How to do Load Management ?
Since electric power can not be stored and used later , so Electricity is produced, distributed and consumed by the Load simultaneously and this is the place where Load Management comes into Action.
Also as the Load demand is not fixed so we have to design the system keeping in mind the Maximum Load Condition. As for example when the Induction Hardening Machine is started then there is a sudden increase in the load by 400 - 600 % , so we have to keep in mind all these behavior of loads. There are many ways for Load Management but here we will focus on PLC based Load Management.
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PLC Programming for Load Management ?To do Load Management using DG Sets, we will need an overcurrent relay that will tell us all the data regarding current and it will help us to determine the load value. The overcurrent relay output will be connected with PLC input MODBUS. We have made this PLC program for Load Management and using ALLEN BRADLEY PLC. There are two sections in PLC program , one is for reading data from overcurrent Relay and other is for PLC logic. PLC logic will provide required output to ensure regular load management by connecting with busbars through contactors.
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Block diagram of load management
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What is PLC ? A Programmable Logic Controller (PLC) is an industrial computer that accepts inputs from switches and sensors, evaluates these in accordance with a stored program, and generates outputs to control machines and processes.
PB1
LS1
INPUTSM1
M2R
LOGIC OUTPUTS
M1
SOL
Block Diagram of a Control System
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Major Components of a Common PLC
PROCESSOR
POWERSUPPLY
I MN O P D U UT L E
O M U OT DP UU LT E
PROGRAMMING DEVICE
From SENSORS
Pushbuttons,contacts,
limit switches,etc.
ToOUTPUT
Solenoids, contactors,
alarmsetc.
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Major Components of a Common PLC POWER SUPPLY
Provides the voltage needed to run the primary PLC components
I/O MODULES
Provides signal conversion and isolation between the internal logic-level signals inside the PLC and the field’s high level signal.
PROCESSOR
Provides intelligence to command and govern the activities of the entire PLC systems.
PROGRAMMING DEVICE
used to enter the desired program that will determine the sequence of operation and control of process equipment or driven machine.
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What' happens in an operating cycle
Based on the data inthe output image filethe PLC energises or de-energises it’s outputcircuits,controllingexternal devices.
1.Input Scan
2. ProgramScan
3. OutputScan
START
-- -
-
PLCOPERATING CYCLETYPICALLY 1 to 25 ms.
During the input scan PLC examines the external input devices -On or Off. The status of the inputs is temporarily stored in an input image memory file.
The PLC scans the instructions in the ladder logic program,uses the input status from the input image file & determines if an output willbe energised.The resulting status of the outputsis written to the output image memory file.
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Inputs and outputs of PLC
INPUTS Pushbuttons
Selector Switches
Limit Switches
Level/Pressure/Temperature Sensors
Photoelectric Sensors
Motor Starter Contacts
Relay Contacts
Transducers/Transmitters
Encoder
OUTPUTS Relay
Motor Starters
Solenoids Valves
Control Relays
Alarms
Lights
Fans
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Programming in PLC
Ladder Logic
Structured Text
Sequential functional chart
Functional Block Diagram
Instruction List
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Programming in PLC
Ladder Logic
Structured Text
Sequential functional chart
Functional Block Diagram
Instruction List
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Ladder logic
Ladder Logic is a graphical system of symbols and terms.
Those who are not familiar with relay wiring. Diagram, can easily learn it.
In ladder logic, we have to translate all of the items we're using into symbols the PLC understands
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Advantages Simple wiring Flexibility in programming and reprogramming in the
Plant. Low space Wider functions like high speed counters, etc. Faster Scan Time. Simpler installation. Economic in cost. Minimum maintenance. Ability to communicate with HMI/MMI Programmable troubleshooting aids which reduce
downtime
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Short-comings Difficulty with changes or replacements. Difficult to find error hence require skillful workforce. When problem occurs, hold up time is indefinite.
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References
http://en.wikipedia.org/wiki/Load_management
http://ab.rockwellautomation.com/Programmable-Controllers/MicroLogix-1100
https://www.energyvortex.com/files/PLCCaseStudy.pdf
http://www.plcedge.com/plc-architecture.html
Automating Manufacturing Systems with PLC by Hugh Jack.
http://www.princeton.edu/~achaney/tmve/wiki100k/docs/Ladder_logic.html
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Thank You