How To Test an SCR

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In this video I will test three different power SCR's. We will determine which one is bad! I will go over the methods I use to successfully determine if they are shorted, and also if they are turning on. These devices are usually the main power switching devices in DC motor drives/amplifiers around the world! SCR is commonly also known as the thyristor. This video does not cover SCR theory but rather methods on testing an SCR.
Remember, this can not determine if the "latching" of the SCR is working. This failure is very rare, but possible. Always consult a spec sheet of an SCR before you test it. Damage can be caused to the device if you are not aware of its allowable voltage and current specifications.
Warning: Please do not attempt any electrical testing or troubleshooting if you are not an experienced electrician or technician, well trained with electrical voltages/currents and the damage they can cause. You are responsible for your own actions.
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Опубликовано:

6 авг 2024

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Комментарии : 58

@johanlundh5038 Год назад

Excellent video. You got yourself a new subscriber today! 😊True pedagogy is such a rare trait and you truly are one of those precious few. Cheers from Sweden and happy new year!

@MrBtdobie 3 года назад

The pressure requirement is what landed me here. Works great now. Thanks 😊

@montygore1200 Год назад

Thank you for this video. I have been retired for a very long time and was checking a battery charger I have that quit. I could not remember if I should get a reading between the anode or cathode and gate. I looked everywhere and could not find the answer I needed. Thank you for this video. Excellent info.

@markd.nightingale4266 2 года назад

Great video! Very informative thorough presentation!

@sadhunikul2611 8 месяцев назад

thanks for SCR explanation , it helps a lot

@tlsatlsa6821 28 дней назад

Liked and subscribed! Had to test some puck SCRs today.

@richardjones3112 3 года назад

Brilliant video.Thanks.

@jacksonwilson576 7 месяцев назад

Great. It was so helpful to me. Thanks

@keithb4158 Год назад

Excellent tutor!

@syedzakirhussain-sb6we Год назад

Great video. Sir, please make the video on IGCT testing

@vfdrepairinglab 4 года назад

Good work

@ammarsalih6058 2 года назад

Thank you very much indeed I realy understand the methode very well

@fattahjamil2452 3 года назад

thank you my dear teacher

@onefixitman Год назад

It would be great to see the resistance from anode to cathode while the gate signal is turned on and continue reading while removing gate signal. It should conduct until reverse biased. Thank you for the video.

@qzorn4440 4 года назад

great video, also in vacuum spaced tubes the electron has to break free and travel through the mostly empty vacuum to cause current flow...thanks...:\ which direction?

@inversionesalucel5529 3 года назад

Great, it is clear, however not so when you consider enough or too high resistence values. How do you decide what is enough or high? has this criteria rounding the Thyristor size? Please help us to understand better, Appreciated

@deadbluesky 4 года назад

On a 40TPS08A if i have only negative resistance is the SCR is defect ??

@eleindc 2 года назад

Thank you sir

@meermasum4150 3 года назад

Thanks for your video. Any possible change to gate 5,4 and 6,7 connected. I mean 5 to 7 or 6 to 4 are connected. Actually I have a this type of thyristor which shown is 5 to 7 31 M ohm, 5 to 6 31 M ohm and 4 to 7 31 M ohm, 4 to 6 32 M ohm. But another thyristor's showing OL/open loop those point combination. Please reply me.

@Jose-tw9bl Год назад

The preassure required for these hokey puck diodes is stated in the datasheet, but how the heck do i verify the clamping force? I just tighten the bolts on the heatsink but i have no idea how much force i am applying... Any ideas?

@keivn91 9 месяцев назад

Thanks!

@heroestec534 3 года назад

Please tell what must be battery voltage??

@kiron443 2 года назад

Thanks man

@brucemansfield2501 Год назад

I have a puck scr that is reading resistance without any pressure on it. Does that mean it’s shorted?

@SabaM615 11 месяцев назад

If I have dag in one of my current phases from thyristor whuat could cause it?

@wh8089 4 года назад

Great work, but if we setting the dial of multi meter on diode tester ..and without applying a signal current on the gate just applying a compression force on it By testing Anod and cathode by diode selection tester is not enough. , please I need to your answer.

@electrotec7113 4 года назад

The video demonstrates a quick method to determine the quality of most scr devices. If the example described didnt give you sufficient results, to be more precise, a bench top setup with variable power source is needed.

@HolyDiver22 2 года назад

Hey man, I have a mini lathe with a brushed dc motor driven by SCR’s (A69154) and cannot for my life find a data sheet for. Do you possibly have the resources? I’ve got 76ohm b/t outside leads but not sure which is gate or cathode.

@robertgraham3715 5 месяцев назад

Is 1.6meg ohms to low on the SCR anode to cathode? The new ones we have are 20 meg ohms

@mohamadhady1518 4 года назад

Appreciated

@PaulusPanjaitan Год назад

bro, how about resistance Kathode to Gate? is it should the same resistance with Gate to Kathode?

@geomen2405 3 года назад

What if an scr after being triggered doesnt stay on

@faisal5370526 2 года назад

Good video sir nice sharing 👉👉👉👉❤❤❤❤❤🙏🙏🙏

@user-dg1wi2wi3v 4 месяца назад

hello and congratulations, I have a question, I often deal with 24 to 80 V DC-powered handling systems driven by SCRs of 200-300 A and above managed by the relevant logic/controller. Let's assume that I have an anomaly elsewhere and the SCRs don't come into operation, how can I energize them manually to test them without dismantling them? Let me explain better, the systems control motors, if these do not turn usually the technician energized the first SCR to make them turn, the second SCR which charged a capacitor and then a third SCR which with a sort of countercurrent turned off the first (usually they are disk st333 as in the video, by doing so he was certain that all the power was ok, and he could move on to troubleshooting the auxiliary part, the driving, safety devices etc., therefore what voltage and polarity should I give to the gates always taking into account that some machines are powered by 24v, others by 48, others by 80 and so on. Thank you.

@filmindo4804 3 года назад

Battery tester using Volt?

@xianyurivillegas3739 4 года назад

you mean silver chariot requiem?

@eleindc 2 года назад

You are great I am from India

@DrHarryT 4 года назад

I always viewed "OL" as Over Limit meaning the resistance is beyond the range of the meters current setting.

@surgingcircuits6955 4 года назад

Situation; Over Limit for some, Open Line for others.

@DrHarryT 4 года назад

@@surgingcircuits6955 The only time I have seen the term "Line" used is when referencing power distribution in commercial and residential systems...[Line - Neutral - Ground.] The proper term for that would be Open Circuit.

@surgingcircuits6955 4 года назад

@@DrHarryT , thx. I adopted Open Line for continuity mode checking. No connection, on a DMM, shows O.L. - and I don't consider it Over Limit. So, that's what I was referring to. For other modes (e.g. measuring resistance), if you're set under the measurement, it will be Over Limit. Cheers!

@surgingcircuits6955 4 года назад

Oh, and other's I've heard refer to it as "Open Lead", too. Guess it's a either a preference, or a mystery. :D

@MrCocolius 4 года назад

its posible recuperate a SCR bad?

@DrHarryT 4 года назад

No, like a light bulb, once it is burned out...It's done.

@mohamadhady1518 4 года назад

Who makes dislike its unbelievable

@sattibabu229 4 года назад

80kohms scr also we are using in service , its working normal sir

@electrotec7113 4 года назад

Please remember this is quick tutorial on standard SCRs. There are thousands of different builds which can have different readings.

@industrialtechnology2302 4 года назад

Now in this video,the 3 scr's are working or not working?

@electrotec7113 4 года назад

Please watch the video in detail before making comments

@industrialtechnology2302 4 года назад

@@electrotec7113 i watched the video totally.i have some doubts Can you give me your WhatsApp number ?

@electrotec7113 4 года назад

I apologize as I do not use WhatsApp. What are the doubts? Also, please be reminded this video is explaining how to test with minimal resources. If you have more advanced skills and equipment, there are better ways to test.

@industrialtechnology2302 4 года назад

@@electrotec7113 tell me your mail id ? How to contact you

@industrialtechnology2302 4 года назад

ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-_58voJIHtVs.html

@simplescents3309 Год назад

I think your mistaken . The scr shouldn’t show resistance while scr is off. How I check a bad scr in my industrial facility. Is any one scr that shows any resistance while off is bad . That has always been the case

@electrotec7113 Год назад

Incorrect