Prática de Shadowing: What is an Electrical Control Panel? (PLC Panel Basics) - Aprenda a falar inglês com vídeo
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Have you ever wondered how an automobile assembly line is controlled?
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In this video, we are going to talk about what controls large or small mechanical processes, like an assembly line.
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That device is called a control panel.
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Think of a control panel like the human body.
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Inside our bodies, we have vital organs that control and monitor our surroundings.
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Similarly, a control panel is a metal box which contains important electrical devices that control and monitor a mechanical process electrically.
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Let's get started.
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First, let's talk about the enclosure, the metal box that contains all of the electrical devices of the control panel.
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Enclosures are often aluminum or stainless steel, and the size will vary based on the size of the process.
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A control panel enclosure can have multiple sections.
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Each section will have an access door.
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The size of the enclosure is commonly referred to by the number of doors the enclosure has.
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Each enclosure will have an electrical safety rating designated by UL, the Underwriters Laboratories, who governs electrical safety.
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They will also have an IP rating or NEMA classification which designates the enclosure to be indoor or outdoor,
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waterproof or water -resistant, suitable for hazardous conditions, dust -proof or explosion -proof.
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Now, let's go inside the enclosure and talk about the non -electrical components that make up the control panel.
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First, let's talk about the back panel of the enclosure.
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The back panel is a sheet of metal
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that is mounted on the inside of the enclosure that allows us to drill mounting holes for different devices, which leads us to our next component, DIN Rails.
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A DIN Rail is a metal rail with a standard width used for mounting electrical devices inside.
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The next component inside the control panel is Wiring Duct.
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Ducks allow us to route the wires in an organized and efficient way, while also reducing electrical noise between devices.
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Next, let's get into the electrical components of the control panel.
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The main circuit breaker is where the power comes into the control panel for all of the devices.
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This circuit breaker generally has a disconnect on the outside of the panel that allows us to shut off the power.
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Always remember the top side of the circuit breaker will still have power.
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The power that comes into the panel can be anywhere from 480 volts to as low as 120 volts.
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After the power comes into the panel from the main circuit breaker, the power will be run into a surge arrestor.
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A surge arrestor is a device that protects all of the electrical equipment inside the control panel from electrical surges or overvoltage.
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An electrical surge can come from a lightning strike or utility power surge.
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The power can be connected into a transformer that switches the power down in order to power smaller devices.
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If the incoming power is above 120 volts, a transformer is generally used.
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If the power is 120 volts, a power supply can be used to step the power down to 24 volts.
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Now that the control panel has incoming power from the main circuit breaker and power distributed by a transformer or power supply,
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the different voltages can be wired into terminal blocks for even more routing of power throughout the control panel.
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A terminal block consists of two terminals that can join two or more wires together.
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Terminal blocks can be arranged with several other blocks in a
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strip mounted on a DIN rail to run power from one source to several devices throughout the panel.
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The final part of the control panel are the devices that control and monitor the mechanical process.
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Let's talk about the PLC or Programmable Logic Controller.
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The PLC is like the brain of the entire process.
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The PLC will have a CPU where the logic program is stored.
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It will have associated inputs and outputs which will help control and monitor the assembly line.
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Speaking of our terminal blocks, we will have wires running from them to our inputs and outputs.
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This allows for the actual control of the assembly line.
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Field devices, such as proximity switches, photo eyes, and other sensors,
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are set up on the assembly line to give the feedback needed for the PLC to control the operation of the line.
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The PLC outputs will be wired to a bank of relays
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that will close an internal contact that will send power out to turn on or off a device on the assembly line.
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Smaller relays will control devices such as lights or fans, while a bigger relay, called a contactor, is used to control motors.
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We will also have a network switch located somewhere near the PLC.
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This will be powered with 24 volts, and it will be the hub for our communication to and from the PLC to network compatible devices on the assembly line.
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One of those devices is our Human -Machine Interface or HMI.
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An HMI can be mounted locally onto a panel door or in a remote panel located closer to the machinery.
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The HMI can be a very dynamic tool in assisting the operator in controlling and monitoring the machinery.
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The PLC will pass signals over the network to the HMI for monitoring, and the HMI can send signals to the PLC for controlling the machinery.
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Today, we talked about the components of a control panel.
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Each control panel will have the main power source coming in
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that is distributed throughout the panel to varying devices for control and monitoring.
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Control panels will come in different sizes, but they all have similar devices that we talked about today.
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Want to learn PLC programming in an easy -to -understand format and take your career to the next level?
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Head on over to realpars .com
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Thank you.
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Vocabulário e dicas de fala para esta lição
Esta aula de conversação usa o vídeo “What is an Electrical Control Panel?”. As palavras que mais se repetem: panel, device, electrical, Plc, enclosure. Este vídeo tem 57 frases e 999 palavras para praticar shadowing. A fala dura 7:25. O falante mantém um ritmo estável de cerca de 135 palavras por minuto, confortável para o shadowing. Apenas 76% das palavras estão entre as 3.000 mais comuns do inglês, por isso o vocabulário é exigente.
Vocabulário principal deste vídeo
15 palavras do vídeo que vale a pena aprender, com pronúncia e significado:
| Palavra | Pronúncia | Significado |
|---|---|---|
| enclosure substantivo | /ɛnˈkloʊʒəɹ/ | cercado |
| monitor substantivo | /ˈmɑ.nɪ.tɚ/ | monitor, observador |
| wire substantivo | /ˈwaɪɚ/ | arame |
| circuit substantivo | /ˈsɝ.kɪt/ | circuito, volta |
| mount verbo | /maʊnt/ | subir |
| component substantivo | /kəmˈpoʊ.nənt/ | componente |
| terminal substantivo | /ˈtɚmɪnəl/ | terminal |
| surge substantivo | /sɝd͡ʒ/ | surto |
| rail substantivo | /ɹeɪ(ə)l/ | corrimão, ferrovia |
| output substantivo | /ˈaʊtpʊt/ | produção |
| mechanical adjetivo | /məˈkænəkəl/ | mecânico |
| machinery substantivo | /məˈʃiːnəɹi/ | maquinaria, maquinário |
| vary verbo | /ˈvɛəɹi/ | variar |
| rat substantivo | /ɹæt/ | ratazana, rato |
| locate verbo | /ˈloʊˌkeɪt/ | localizar |
Phrasal verbs que você vai ouvir
| Palavra | Pronúncia | Significado |
|---|---|---|
| make up verbo | /ˌmeɪk ˈʌp/ | compensar |
Pronúncia para ficar de olho
- Os sons de “sh” e “zh”: enclosure /ɛnˈkloʊʒəɹ/, machinery /məˈʃiːnəɹi/, efficient /ɪˈfɪʃənt/, sheet /ʃit/, associate /əˈsoʊʃi.ət/
- Palavras longas — acerte a sílaba tônica: electrical /ɪˈlɛktɹɪkəl/, mechanical /məˈkænəkəl/, machinery /məˈʃiːnəɹi/, associate /əˈsoʊʃi.ət/, operator /ˈɑpəˌɹeɪtɚ/
Sons difíceis para falantes de português:
- Consoante final — sem acrescentar um “i” depois: circuit /ˈsɝ.kɪt/, mount /maʊnt/, component /kəmˈpoʊ.nənt/, output /ˈaʊtpʊt/, input /ˈɪnpʊt/
- /l/ final — a língua toca o céu da boca, não vira “u”: electrical /ɪˈlɛktɹɪkəl/, terminal /ˈtɚmɪnəl/, rail /ɹeɪ(ə)l/, mechanical /məˈkænəkəl/, vital /ˈvaɪtəl/
Como praticar com este vídeo
- Ouça o vídeo inteiro uma vez sem falar e anote as palavras que você não conhece.
- Faça shadowing frase por frase na velocidade normal, repetindo cada uma até o seu ritmo ficar igual ao do falante.
- Grave a sua voz e compare com o original, prestando atenção a palavras como enclosure, monitor, wire.
O que é a Técnica de Shadowing?
Shadowing é uma técnica de aprendizado de idiomas com base científica, originalmente desenvolvida para o treinamento de intérpretes profissionais. O método é simples, mas poderoso: você ouve áudio em inglês nativo e repete imediatamente em voz alta — como uma sombra seguindo o falante com 1-2 segundos de atraso. Pesquisas mostram melhora significativa na precisão da pronúncia, entonação, ritmo, sons conectados, compreensão auditiva e fluência na fala.