What is an Overload Relay? Connection & Working Principle
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- เผยแพร่เมื่อ 28 มิ.ย. 2024
- 🎥 If you are curious to know what an overload relay is, what an overload relay consists of, how an overload relay is coupled into a contactor to protect a motor, what differences it has with a circuit breaker, and how to test an overload relay to check if it is functioning, watch this video until the end.
By watching this video, you’ll get the answer to these questions:
- What is a motor starter?
- What is motor overload?
- What is an overload relay?
- How to test an overload relay?
- How to wire an overload relay?
- What causes overload current?
- How does an overload relay work?
- What are the components of an overload relay?
- How to connect an overload relay to a contactor?
- What is the difference between a circuit breaker and an overload relay?
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💬 Video Summary:
What is Motor Overload
- If a motor draws too much current and generates too much heat, it indicates running in overload. So, to protect products in industrial automation, an overload relay is used to attach to a contactor to prevent motors from operating in overload.
Overload Relay Operation
- Once the overload relay detects an ongoing overload condition for a considerable time, it will trip and send feedback to the contactor, so the contactor breaks up the current flow and stops the motor.
Motor Overload Causes
- When a rotor gets jammed, and there is a mechanical obstruction.
- When the process of aligning shafts with each other is not properly executed.
- When the ambient temperature is high, and there is inadequate ventilation.
- When a motor is undersized to handle a load which causes additional stress on a motor, and
- When bearings, responsible for supporting the shaft inside a motor, have been damaged.
Parts of an Overload Relay
- Adjustable current setting: By using this dial, you can specify the amount of current the motor must draw to be considered overloaded. In other words, the motor's rated FLA or Full Load Amps can be set here.
- Built-in auxiliary contacts: A pair numbered 95 to 96 is normally closed, whereas a pair numbered 97 to 98 is normally open.
- Reset button: This design allows you to toggle between manual and automatic reset modes and functions as the reset button.
- Test trip button: It may be utilized to simulate a trip off the overload relay to check if the overload relay is working correctly.
- Trip indicator: provides the status of the overload relay visually. Meaning, when an overload condition happens, this indicator turns on.
Difference between Overload Relay and Circuit Breaker
- Using a circuit breaker, you can protect a motor from sudden high-current events caused by a short circuit.
- On the other side, an overload relay protects a motor from the excessive current being drawn from the supply.
Overload Relay and Contactor Connection
An overload relay cannot be used to operate a motor on its own, so you need to pair it with a contactor. Typically, an overload relay is positioned beneath a contactor, often having three prongs extend outside its housing coupled into the contactor load side terminals.
Overload Relay Testing Procedure
Finally, we will show how to test the overload relay using a multimeter set to the Continuity Beeper.
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⏰ TABLE OF CONTENTS ⏰
00:00 Motor Overload Explained
00:52 Overload Relay Working Principle
01:22 Motor Overload Causes
02:02 Overload Relay Components
03:35 Overload Relay vs Circuit Breaker
04:34 Overload Relay Connection With Contactor
05:14 Overload Relay Wiring Diagram
06:46 Overload Relay Testing
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#Automatedo #relay #overload
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1:22 really helped me to understand the difference between a Circuit Breaker and an Overload Relay.
Very clear presentation thank you very much
i highly recommend watching this with captions on, because the captions are perfect. this video is extremely helpful.
Thank you so much for your feedback! 🙌 We are thrilled to hear that you found the captions perfect and the video extremely helpful. Your recommendation means a lot to us! 😊 If you have any friends or colleagues who would benefit from the content, we would appreciate it if you could introduce them to the channel and encourage them to subscribe. 🌟🎉 Your support helps us continue creating helpful videos. Thank you again, and we hope to provide more valuable content in the future! 🙏🔥💪
🎉 1000 thank you I just understundom how it works
This video is fantastic. Really instructive. Thank you.
many thanks for your generous help
Very well explained video!
Fantastic animations as well!
So sweet of you. We glad to have audiences like you 🤗
this was very straightforward and easy to understand
Thank you for the positive feedback! We are glad you found the video straightforward and easy to understand. Our goal is always to make our content accessible and helpful to as many people as possible, so it's great to hear that it was effective for you. If you have any suggestions or ideas for future videos, please let us know. Thanks again for watching and leaving such a kind comment!
Extremely well done! Thank you!!
Easy to understand, good explanation.
Thanks for the explanation I think its very clear and easy to understand.
Very good explanation and good info tq
I typically Enjoyed the lesson
Thank you👏👏👏
Best explanation
Very nicely explained.
Thanks a lot
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Thank you for this great video
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خسته نباشى ممنون
Very good topic tq
Great video well explained❤
Thank you so much for your kind words and encouragement! It means a lot to us that you found the video informative and well-explained ❤️
Well explained ❤
We are glad you liked the video. We will be grateful if you can introduce this channel to other professionals like you so that together we can grow the community of automation engineers 😉
Why does the final schematic show the NC of the overload relay connected to L2 in the end instead of A1?
Excellent video
We glad you liked the content. Thanks for watching. 💮
Your explanation is very good
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Great explanation video i never seen any video likes this ,its my gratitude to explain you knowlede to other,thank you. Its my request i want to know What software r u use to explain this video.
great sir, keep on we appreciate
Thank you so much for your kind words! 🙌 We are glad you found the video great, and we truly appreciate your support. Your encouragement means a lot to us. If you have any friends or colleagues who might also enjoy the content, we would be grateful if you could introduce them to the channel and encourage them to subscribe. Your support helps us continue creating content that you and others appreciate. Thanks again, and we look forward to bringing you more amazing videos! 😊
Excellent
Thank you so much for your precious support dear Mohammad 😀
QUE BUEN VIDEO. CONGRATS
We really appreciate that. If you like out videos, would you mind sharing them with your friends and colleagues? It would really help us grow the channel and reach more people. Thanks again for your support!
Fantastic and clear explanation.
Thank you
Thank you so much for your kind words! We are thrilled that you found the explanation fantastic and clear. Your appreciation means a lot to us! 😊 We are grateful for your support, and if you have any friends or colleagues who might benefit from the content, we would be honored if you could introduce them to the channel and encourage them to subscribe. Your recommendation helps the channel grow, and we truly appreciate it. Thank you again, and stay tuned for more fantastic videos!
Interesting
Great ....
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Nice!👍👍
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R 404 a model alarm connection
Please answer ??
Great
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I get interested i said congratulations Sir
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New subscriber sir
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Hii sir could you please tall software name
Could you please more specific. What software do you mean?
I need speak with dear engineer do u have whatsapp
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