How to Read Electrical Wiring Diagrams TUTORIAL for Beginners
Summary
This video provides a comprehensive introduction to reading electrical schematics for industrial automation, using a pallet wrapper machine as a practical example. It covers basic symbols, component identification (PLCs, inverters, contactors, relays, switches, fuses), signal flow, and interpretation of wiring diagrams. The tutorial emphasizes the practical application by comparing schematics with a 3D model of a control cabinet and demonstrating live on a PLC training station. It also highlights common mistakes and introduces the control.tech e-learning platform, offering a discount for their industrial automation courses.
Key Insights
Learning to read schematics is crucial for engineers.
The trainer emphasizes that mastering the skill of reading electrical schematics makes an engineer proficient, especially when dealing with components like PLCs, inverters, and motors.
Wire labeling is crucial for maintenance and troubleshooting.
Using a printer to label each wire with designations (e.g., module number, input/output) significantly aids in maintaining and troubleshooting control circuits.
PLCs are the 'brains' of automation systems, processing inputs and controlling outputs.
The PLC (Programmable Logic Controller), exemplified by the Siemens S7-1200, receives signals from inputs (sensors, buttons) and controls outputs (relays, indicators, drives) based on programmed logic. Proper wiring and schematic reading are essential for PLC integration.
The course offers a virtual control cabinet and schematics, eliminating the need for hardware.
To address the high cost of physical automation equipment, the course provides access to virtual control cabinets and electrical schematics, allowing learning solely through a computer.
The core value proposition is learning essential skills for a professional automation career.
The program aims to equip individuals to become professional industrial automation engineers, emphasizing practical skills in reading schematics and understanding components, all accessible through an online platform.
Sections
Introduction and Course Overview
Trainer Matt Gruentowitsch introduces the webinar on reading electrical schematics.
The trainer, Matt Gruentowitsch, welcomes viewers to the webinar, stating the topic is how to read electrical schematics in industrial automation. He mentions that this is a preview of their full course available on the control.tech platform. Viewers are encouraged to ask questions in the chat.
Demonstration uses a pallet wrapper machine's electrical schematic and 3D model.
The training uses an electrical schematic of an industrial pallet wrapper machine and its corresponding 3D control cabinet model to illustrate concepts. The course teaches about the potential of connections and appliances within the control cabinet, covering main power supply, terminal blocks, switches, lamps, contactors, power supplies, and PLCs.
Learning to read schematics is crucial for engineers.
The trainer emphasizes that mastering the skill of reading electrical schematics makes an engineer proficient, especially when dealing with components like PLCs, inverters, and motors.
Special promotion for the control.tech course is announced.
A limited-time promotion offers a 49% discount on the control.tech platform courses, available until Thursday.
Essential Concepts and Tools
Key topics include basic symbols and signal flow interpretation.
The webinar will cover automation wiring diagrams, basic symbols, schematic elements, quick interpretation of signal flow, control logic, and common mistakes with avoidance strategies.
CAD software is essential for creating electrical schematics.
To draw electrical schematics, specialized CAD software is required. Examples mentioned include SolidWorks Electrical (used by the company), EPLAN, AutoCAD Electrical, WSCAD, and Z Electrical. The audience is asked about their software usage.
Schematic symbols are largely consistent across different software.
Despite variations in drawing software (EPLAN, SolidWorks Electrical, Z Electrical), the fundamental symbols used for components like conductors, coils, motors, terminal blocks, isolators, and fuses remain similar.
Component identification involves letters and numbers.
Industrial automation components are described by area and function. For example, Q1 designates an isolating switch with its nominal current. Lumps are designated by H, fuses by F, and contactors by K. Area and function are also coded (e.g., F2 for entry conveyor, A1 for main electrical cabinet).
Understanding disconnecting devices is fundamental.
Symbols for various disconnecting devices like contactors, circuit breakers, switches, and isolating switches are prevalent in schematics and must be learned.
Fuses and protective bonding circuits have specific symbols.
Fuses are typically represented by a rectangle with a line and designated by 'F'. The protective bonding circuit (PE) is shown as a green line with dots, and neutral wires are also indicated.
Schematics detail component specifics like current ratings and mounting.
Data sheets for components provide essential parameters like thermal current. Dimensions for mounting devices in control cabinets are also detailed in schematics.
Wiring conventions include color coding and connection types.
Schematics use specific colors for wires (e.g., red for phase lines L1, L2, L3). Protective earth is green with dots. Connecting nodes are shown, and crossed lines can indicate no connection. Wiring harnesses and potential arrows with names (like PE) are also used.
Overcurrent protection devices are critical safety components.
Devices like miniature circuit breakers (MCBs) for one or three phases, including protective earth, are essential for preventing damage from overcurrents. Motor switches with electromagnetic and overcurrent protection are also discussed.
Understanding component requirements is key for design.
Each element in a control cabinet has specific requirements for its industrial automation application, detailed in datasheets, influencing selection and installation.
Schematics map components to physical locations and functions.
Schematics divide machines into areas (e.g., A1: main electrical cabinet, A2: wrapper control cabinet) and functions (e.g., F2: entry conveyor). This coding helps locate and understand components.
Comparing schematics to 3D models aids comprehension.
The ability to compare electrical schematics directly with a 3D model of the control cabinet allows for easier visualization and understanding of how connections translate to physical layouts.
Practical Application and Component Deep Dive
Live demonstration on a PLC training station.
The trainer uses a PLC training station to demonstrate practical wiring. This includes connecting a PLC with 24V DC power, inputs, outputs, Modbus RTU communication, and interfacing with relays, an inverter, and a potentiometer for motor speed control.
Wire labeling is crucial for maintenance and troubleshooting.
Using a printer to label each wire with designations (e.g., module number, input/output) significantly aids in maintaining and troubleshooting control circuits.
Relays are often used to interface between PLCs and higher current devices.
Relays serve as an intermediary between PLC outputs and devices like contactors or motors when direct connection is not feasible due to current limitations.
Inverter connections include digital and analog inputs/outputs.
Inverter schematics show connections for digital inputs (DI) for control signals (start, stop) from the PLC, analog inputs for speed control (e.g., via potentiometer), and three-phase outputs to the motor.
Button types and connections to PLC inputs are fundamental.
Various buttons (E-stop, stop, reset, start, direction switch) are shown with their schematic symbols. Normally closed (NC) and normally open (NO) contacts are explained, and how they connect to PLC inputs.
The Siemens V20 inverter schematic is detailed.
A specific example of a Siemens V20 inverter schematic is presented, highlighting its digital inputs for PLC control signals and analog inputs/outputs for motor connection and speed regulation.
Wire designation facilitates tracing on schematics and trainers.
Wire designations, such as 'module one, input I 03', are used on schematics and trainers to allow tracing of each potential throughout the control cabinet.
Residual Current Circuit Breakers (RCCBs) enhance safety.
RCCBs are safety devices that monitor current and trip if an imbalance is detected. They include a test button for functionality checks.
Contactors are central to controlling high-power devices like motors.
Contactors are K-designated devices with a coil (A1, A2) that, when energized, closes main contacts to supply power to devices. Auxiliary contacts can provide status feedback to PLCs.
Relays function similarly to contactors but for lower currents.
Relays, like contactors, have coils and switch contacts. They are used for lower current applications and can be single-pole, double-pole, or four-pole.
Multi-position switches control multiple states like motor direction.
Switches with multiple stable positions (e.g., zero, left, right) are used for functions like selecting motor rotation direction. These have connection terminals for power supply and signal output.
Sensors (inductive, capacitive, optical) interface with PLCs.
Various sensor types can be connected to PLC inputs for detecting the presence or absence of objects, crucial for automation processes.
PLCs are the 'brains' of automation systems, processing inputs and controlling outputs.
The PLC (Programmable Logic Controller), exemplified by the Siemens S7-1200, receives signals from inputs (sensors, buttons) and controls outputs (relays, indicators, drives) based on programmed logic. Proper wiring and schematic reading are essential for PLC integration.
The course provides a PDF guide with common symbols and explanations.
As a bonus, the course includes a PDF guide featuring frequently used electrical symbols, photos of equipment, terminal explanations, and diagrams for sensors, switches, fuses, relays, and contactors.
Functional safety standards are covered with manufacturer support.
Another bonus is guidance on functional safety standards, supported by Villant Electric Company, adding another layer of crucial knowledge for automation professionals.
Control.tech E-learning Platform and Course Details
The course offers a virtual control cabinet and schematics, eliminating the need for hardware.
To address the high cost of physical automation equipment, the course provides access to virtual control cabinets and electrical schematics, allowing learning solely through a computer.
The course structure progresses from basic to complex concepts.
Concepts are explained from scratch, starting with basics and moving to more complex topics, making it accessible even for individuals with no prior knowledge.
Discord support group fosters community and motivation.
A Discord support group is available to help students stay motivated, share challenges, and learn collectively, creating a community around industrial automation.
Learning can be done at one's own pace, accessible 24/7.
The e-learning platform provides 24/7 access to course materials, allowing students to learn at their own pace, even on tablets or smartphones, though a computer is recommended.
The course is designed for practical project creation and application.
Students will work on real projects, like the pallet wrapper, and receive tasks to apply their knowledge, helping them build a portfolio and CV for future employment.
Special offer: Limited-time discount on the Industrial Automation Basics course.
A special offer provides the Industrial Automation Basics and electrical schematics course for 97 euros (down from 189 euros), with registration closing in 3 days. Multiple bundles and single courses are available, with secure payment via Stripe or PayPal.
The course targets individuals aiming for careers in automation project management and maintenance.
The course is ideal for those looking to create or upgrade installations, provide maintenance, and manage projects in the automation industry.
Refund guarantee is offered for dissatisfied students.
A 14-day money-back guarantee is provided. Students unhappy with the course can request a full refund via email.
The core value proposition is learning essential skills for a professional automation career.
The program aims to equip individuals to become professional industrial automation engineers, emphasizing practical skills in reading schematics and understanding components, all accessible through an online platform.
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