쉐도잉 연습: What is an Electrical Control Panel? (PLC Panel Basics) - 영상으로 영어 말하기 배우기
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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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이 레슨의 어휘와 말하기 포인트
이 말하기 레슨은 영상 “What is an Electrical Control Panel?”을(를) 바탕으로 합니다. 가장 자주 반복되는 단어는 다음과 같습니다: panel, device, electrical, Plc, enclosure. 이 영상에는 섀도잉할 문장 57개와 단어 999개가 있습니다. 말하는 구간의 길이는 7:25입니다. 화자는 분당 약 135단어의 일정한 속도로 말해서 섀도잉하기에 편한 속도입니다. 영어에서 가장 많이 쓰이는 3,000단어에 속하는 단어가 76%뿐이라 어휘가 어려운 편입니다.
이 영상의 핵심 어휘
영상에 나오는 익혀 둘 만한 단어 15개를 발음, 뜻과 함께 정리했습니다.
| 단어 | 발음 | 뜻 |
|---|---|---|
| monitor 명사 | /ˈmɑ.nɪ.tɚ/ | 모니터 |
| wire 명사 | /ˈwaɪɚ/ | 철사 |
| component 명사 | /kəmˈpoʊ.nənt/ | 부분 |
| terminal 명사 | /ˈtɚmɪnəl/ | 터미널, 공항 터미널 |
| rail 명사 | /ɹeɪ(ə)l/ | 선로, 레일 |
| output 명사 | /ˈaʊtpʊt/ | 출력 |
| rat 명사 | /ɹæt/ | 쥐 |
| format 명사 | /ˈfɔːɹ.mæt/ | 포맷 |
| refer 동사 | /ɹɪˈfɜː/ | 언급하다 |
| assist 동사 | /əˈsɪst/ | 돕다 |
| efficient 형용사 | /ɪˈfɪʃənt/ | 효율적인 |
| remote 형용사 | /ɹəˈməʊt̞/ | 원격, 먼 |
| sheet 명사 | /ʃit/ | 장, 시트 |
| associate 명사 | /əˈsoʊʃi.ət/ | 제휴자, 조합원 |
| connect 동사 | /kəˈnɛkt/ | 잇다, 연결하다 |
주의할 발음
- “sh”와 “zh” 소리: enclosure /ɛnˈkloʊʒəɹ/, machinery /məˈʃiːnəɹi/, efficient /ɪˈfɪʃənt/, sheet /ʃit/, associate /əˈsoʊʃi.ət/
- 긴 단어 — 강세 위치에 주의: electrical /ɪˈlɛktɹɪkəl/, mechanical /məˈkænəkəl/, machinery /məˈʃiːnəɹi/, associate /əˈsoʊʃi.ət/, operator /ˈɑpəˌɹeɪtɚ/
한국어 화자가 어려워하는 소리:
- /f/ — ㅍ(/p/)으로 바꾸지 말고 윗니를 아랫입술에 대기: format /ˈfɔːɹ.mæt/, refer /ɹɪˈfɜː/, efficient /ɪˈfɪʃənt/, feedback /ˈfiːdˌbæk/, classification /ˌklæsɪfɪˈkeɪʃən/
- /v/ — ㅂ(/b/)과 구별하기: vary /ˈvɛəɹi/, vital /ˈvaɪtəl/, voltage /ˈvəʊltɪd͡ʒ/, govern /ˈɡʌv.ən/, volt /vəʊlt/
- /z/ — ㅈ이 아니라 성대를 울리는 /s/: resistant /ɹəˈzɪstənt/, organize /ˈɔɹɡənaɪz/, surroundings /səˈɹaʊndɪŋz/, hazardous /ˈhæ.zɚ.dɪs/, designate /ˈdɛz.ɪɡ.neɪt/
이 영상으로 연습하는 방법
- 먼저 말하지 않고 영상을 끝까지 듣고 모르는 단어를 적어 둡니다.
- 보통 속도로 한 문장씩 섀도잉하고, 화자의 리듬과 맞을 때까지 반복합니다.
- 자신의 목소리를 녹음해 원본과 비교하고, monitor, wire, component 같은 단어에 특히 주의합니다.
쉐도잉이란? 영어 실력을 빠르게 키우는 과학적 방법
쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.