HOW TO TEST A CONTACTOR
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- čas přidán 20. 11. 2019
- Hello Viewers,
This video tutorial gives an in depth view on how to test Contactors. A fluke multimeter is used to check for resistances and contuinuity in different aspects of the testing. This testing was done in a controlled environment and completely isolated from any power sources. SAFETY FIRST!!
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I will read you comments and reply to each one as best I can. Feel free to share your views and tips on the topic discussed in the video. Thank you.
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Simple!!! Great teaching. Making something complex and break it down simple
Thank you for your feedback. Appreciate it.
Thanks for this, I diagnosed a faulty contactor on my machine because of this video!
Good to hear James! Thank you for watching and stay tuned for a lot more.
Thanks for the video. Real clear and slow enough to easily understand
Thank you. Happy I could help.
What a helpful video, thank you for sharing your knowledge!
You are welcome. Thank you for watching.
Great job on explaining this,very helpful.
Glad I could help!
Well detailed short tutorial. Well done
Thank you for your feedback.
I have learned a lot abount contactor.
Thanks for sharing this info.
Thank you for the feedback.
This is a very informative video . Thank you very much.
You are welcome. Thanks for the positive feedback.
Thanks for the video!!
You are welcome Kevin. Thank you for viewing and leaving a positive feedback.
Extremely helpful I checked my contactor and it was bad and I thank you for the time.
Happy I could have helped in this situation.
Thank you for sharing your knowledge.
You're welcome.
Good job explaining bro. Thanks
You're welcome!
Great video. Thank you for sharing your knowledge. Greetings from Peru.
My pleasure Christopher. Thank you for the feedback.
Wonderful thank you!
Seriously you are good @ explaining , all your videos are big help to me, Thank you!!!! from TIGRAY
Thank you for the kind words. Happy I could help.
Really nice video! Go for more ! 👍🏻
Thank you for the feedback.
Wa gwan. Awesome video! Very concise and informative! Keep up the good work!
All is well. Thanks much for the feedback. Will definitely continue to do quality work.
Great explanation, very helpful
Much appreciated.❤
You're welcome.
Hmmn learnt something new, good vid Mr Fisher!
Thank you for the feedback. Happy you did.
easy to understand, thanks.
Excellent teaching.
Thank you for the feedback.
Nicely explained!👍
Thank you.
Very informative bro. Keep up the good work.
Thank you for the feedback.
Thanks for showing us how check a contactor on a motmetter.
You are most welcome.
Great tutorial 👌
Thank you.
Good job in explaining. Simple yet easy to understand. Keep it up.
Thank you very much for the positive feedback.
This is informative, and useful for people. However, A very important test is while it is in service in its operating environment/capacity.
You would use your AC mv scale and test across the respective phases from line->load.. That will give you a better insight as to the connection being made, and the state of the contacts..
A normal reading would be something along the lines of L1- 44mv, L2- 38mv, L3- 42mv.. All the readings are relatively similar to one another.
Something to indicate probable worn/burnt contact pads would be L1- 44mv, L2- 218mv, L3- 42mv.. Here, you have one, or more that are different, and not relative to the others.
This test is more practical, as it allows you to inspect it without taking it out of service.. These readings would/should initiate procuring a replacement before a inevitable failure occurs.
If you want the back light on your meter to remain on all the time- just press and hold the light button as you cycle your meter on- that will keep the backlight on until you turn it off..
Good video.
Thank you very much for this Mike. You definitely just taught me something new. I will try your method and share it with persons in my field. Once again thank you for taking the time to write such a detailed guide on how to carry out the testing. Thank you and appreciate your feedback.
Good day sir. Nice and clear explanation. Thank you for sharing your knowledge.
You are most welcome. Thanks for watching.
Thanx from USA
You are most welcome.
thanks for the video, its going to help me determine why my 3phase air compressor keeps tripping the circuit breaker
Happy I could help.
Very good, thanks
You're welcome.
Thank you Jamaica 🇯🇲 I know that accent anywhere Greetings from 🇧🇿 Belize!!!! ☮️
You are welcome brother. Good catch on the accent 👌 Greetings!
Wow ,,,yu make me to remember most on magnetic contactor
Happy I could help. Thanks for watching.
Well said no question . Am now a contactor prof.
Thank you for the feedback.
Great video
Thank you for the feedback.
Good explaination
Thank you.
Excellent vid
Thank you.
Very good easy understood thank u
Thank you for the feedback.
Brilliant
Awesome 👍
Thank you.
Well delivered
Thank you Sam.
Thank you
You're welcome.
Good one sir👊🏾
Thanks for the feedback.
Interesting .
Thank you for the feedback.
Hi! I have a new schneider contactor but the reading for the coil is 1.9K ohm. When testet it work fine. Maybe different contactor have different reading. Good information btw. 😄
Yes you are correct. Different contactors coil readings will vary based on the brand, coil turns, condition of coil windings etc.
💪
Thanks for the video!
Did you come across Sprecher and Schuh contactor with electronic coil?
I had a trouble with a motor on a contactor like that and when I tested the coil on ohms range it was OL, so I assumed that's the issue - burned coil.
But it turns out those contactors are electronic coils and ohms range will always show you AL.
Thanks for the feedback. Yes the contactors with electronic coils function differentl. Because it utilizes a PCB and solid state devices that will trigger when energized you'll get the OL reading even though the coil circuit it perfectly fine.
Thanx
You're welcome.
Can a person use this fore a stove ; a stove consume to much power and we can not cope with these electric bills ; i just need a tipe of a step up transformer fore the stove
This will reduce the power consumption of the stove. This is only a switching device for high amperage application. You might want to get a more efficient stove or reduce the usage to cut back on the bill. Thank you.
I have a weg 2pole contactor for an air compressor.
230v/single phase/60hz
(Weg cwm40-00-20v24)
Or
(Weg cwm40 2p).
I have a no start condition with voltage present and a working on/of switch and working pressure switch. Compressor turns on when i manually press contactor. When isolated, coil reading is 319ohms. Is this resistance value too high for proper current flow?
When installed and compressor plugged in i have 120v on each a1 and on a2, but 0v across the two. This contactor is rated for 208v-240v and 32-40a.
Also has an overload that is new and operational.
I'm thinking it may be the coil, but not certain.
Any advice on cause or further troubleshooting help?
Good day and thanks for your question. Isolate both wires connected to a1 and a2. Measure a1 to ground, a2 to ground ( for each instance you should 120v). Place one lead of your multimeter on the wire disconnected from a1 and the other wire disconnected from a2 ( 240v should be your reading). If you are not getting the 240v ensure that you are using a double pole breaker to supply the 240v. If you have a disconnect very that 240v is on the line and load side. If you test at the terminals check the wires from the disconnect to the coil. Sounds like you have a loose connection for one of your power wires.
Please show wired dol starter continuity test in other video too. Will appreciate
Thank you. Will try to get one done as soon as possible.
Waah gwaan mi genah? great video 💯👍🏾 link mi up mi want some help wid ah motor.
Nuff respect bro. What issues you having?
Thank you. So a contractor is basically a relay?
Yes with a higher current switching capacity.
You should check ohms at the power block before you check resistance
Thank you for mentioning that step also.
Do more videos 📹 troubleshooting please
Will be doing a lot more videos I'm just caught up with work right now.
Will be doing a lot more videos I'm just caught up with work right now.
Nice video man!I have a question.How to check Amper when it is already connected and it is impossible to see the sticker?
You would need a Amp clamp meter around the individual wires to check the current flow.
Hi, the Abb 45a contactor coil i have now is consuming whooping 190 watts rated at 220 @ 0.9. The resistance is around 22 ohm. and insanely gets hot and starts smoking within matter of seconds from switching on. So it means that coil insulation is failure right?
Yes that's more than likely the issue. I have personally never experienced a smoking coil that still works but I would definitely recommend changing that contactor. Also verify that you are supplying the correct coil voltage. Thank you.
@@synectum640 it would be nice if could find time and make videos on contactor coil protections.
Thanks for the suggestion. Will look into it.
I knew how test any electric advice in the table resistance, but l didn't knew how in live circuits please tell me
I will try to do a video on that. Thank you.
How many times should i press the contactor?
Just enough to complete testing.
Does a magnetic contactor coil consumes electrical energy?thanks sir
Yes there is power consumption that is slightly more when the coil is being energized compared to when mutual induction is setup in the electromagnet . Changing or creating a magnetic field includes moving charges Particles ( in this case electrons through coils of wires), and hence energy is consumed. I hope this answered your question.
How do i connect a mce dol
I would have to create a video to explain it properly. Thank you.
What circuits are these normally used in?
These are predominatly used in industrial applications where motor control is required.
.
What is the ampere rating for this contactor
9 Amps.
Hella
Test
How did you know 130 was a good number? How much higher or lower than 130 could it read and still be good?
Coil usually fails in an open state ( OL on multimeter) or shorted (O on multimeter). Coils will have different resistance values based on manufacture, quality or wire used, number of turns or wire, CSA or wire etc. Usually based on experience if you have a coil resistance that is not open or shorted its usually still good. To verify if it's working correctly you could always disconnect the power (high voltage wires) and supply coil voltage to confirm its closing the power contacts. Additionally if you have further doubts you could contact the manufacturer directly or check data sheets for that part to find the specified range for coil resistance.
Why cant you use the continuity setting on the multimeter?
The continuity setting can be used. By using the resistance setting it however checks the conditions of our contact points ( if they are burnt or pitted) which would have a slightly different ohm reading. The continuity setting will just test for contact or a closed line.
I would like to pick you brain for a moment if and when you get a chance please and thank you sir
Go ahead. I'm just seeing your reply.
Is a1 and a2 connected together ?
A1 & A2 are the terminals for the coil that when energized creates and electromagnet. To answer your question yes they are connected as they form the ends of the coil.
@@synectum640 so if i put a multi meter on ohms across a1 and a2 i should have a circuit? Also how do i know if the coil is bad and what ohms reading it should get?
Good day. The resistance value of coils differ based on design and rating value. A bad coil can have a very high resistance (coil open OL), very low resistance ( coil shorted) as well as a fluctuating resistance reading in some cases. Best way is to check a data specification sheet to see the design resistance value and compare it to the measured value. Also if you have the rated coil voltage you could also bench test it to verify its functionality.
Thank you for your answer, i am doing a electrica apprenticeship and i really like control circuit and automstion but i have no experience and teacher to teach me, how can i tell if s timer in a control circuit is not working ? Do you know?
Hey Giang. There are a variety of timers to consider for example; o. Delay, off delay, pulse retentive etc. The general principle is after a timed function, contacts are usually opened or closed based on the design type. Best way to check is to supply the required voltage, wait for the timer to time out then verify that the output change occurred. In order to carefully explain how each work will take alot of time and it would be easier for me to do a video to capture everything. What I would advise you to do is not rely solely on your lecturer/teacher/mentor but also to do your own research on different areas so you can have a clear understanding on your own.
So I take it, we are not to test in live setting, I wanted to see if welder outputs as the electromagnet is not pulling in when welder fires up or when trigger pulled, whichever sends signal.. will test signal next.. the A1/A2 just not sure if this is AC or DC that triggers the coil.I see yours says AC... my did not specify..
Wanted to test before bought a new switch so not wasting my money, thanks.. will look for other markings, it is wedged inside welder and have to figure out how to release off its perch.
Follow these steps:
1. Disconnect unit from all power source.
2. Set your multimeter to the ohm setting and measure across a1/a2 ( doesn't matter if it's a ac or dc coil).
3. If your reading is O/L or 0.1 to 0.5 ohm then chances are your coil is bad and you need to replace the contactor.
4. You can also test when energize ( however this is dangerous and if you do not have experience with electricity then I wouldn't advise such). Try the previous steps then message me and I'll walk you through it.
How can u donate to this Chanel please send me dm!!!!! Bless up bro
www.paypal.me/synectum
Thanks for the feedback and happy I could help.