Thread: What's this fried electrical component in my surface grinder?

"L" normally denotes an inductor. So I would guess they are 10uH inductors ... I'll see what else I can find.

Here is one I found (different package and higher rating) - http://au.element14.com/bourns-jw-mi...mhz/dp/1103703

Here is another, but it has a slightly lower rating - http://www.jaycar.com.au/Passive-Com...Choke/p/LF1522

It's an inductor. While caps have a voltage rating, inductors have a current rating. The current rating can be seen printed on the side. L6 for example looks to be 10 micro Henry and rated to 0.92A. The one posted by Vernon from Jaycar does not have as high a current rating at only 0.5A, the second one (from element14) looks to be a good replacement.

Simon

Thanks Vernov and Simon. Inductor it is. I will hunt down the necessary replacement.

Chances are that it will burn again. It has overheated because of excessive current. You need to find out what was the cause for it to burn. It is probably driving something. Right now, can you tell which function is not working? Chris

Originally Posted by cba_melbourne

You need to find out what was the cause for it to burn.

I think there may be clues to that in the original post.

From a quick glance at the board, I would think the 10uH inductors are for filtering high frequency noise from the encoder power supply circuits. The HP 2630's are high speed opto isolators, so if you shorted the downfeed encoder supply, and the inductor burnt out, that's pretty fair indication that it was just supply side filtering. The other possibility might be a smps for encoder supply but I don't see the switcher?

They are pretty standard encapsulated inductors ! If you look at the others you will see "RS" marked on them, I'll bet that "Radio Spares" supplied them and will have replacements on stock.

Originally Posted by RayG

From a quick glance at the board, I would think the 10uH inductors are for filtering high frequency noise from the encoder power supply circuits. The HP 2630's are high speed opto isolators, so if you shorted the downfeed encoder supply, and the inductor burnt out, that's pretty fair indication that it was just supply side filtering. The other possibility might be a smps for encoder supply but I don't see the switcher?

Thanks for the explanation Ray. I had no idea what it was. It melted and was hanging off the board. In the usual rush to get things running I clipped some of the covering and soldered it back in plate. No problems despite grinding a few things. I will replace it however as it's not right to leave it in that state.

PS: It has been a bit of a distraction from the Boley.. hoping to get back onto it this weekend!

Originally Posted by BaronJ

They are pretty standard encapsulated inductors ! If you look at the others you will see "RS" marked on them, I'll bet that "Radio Spares" supplied them and will have replacements on stock.

I am happy for you to supply the link to the direct replacement I have not been able to find the exact same type. Some of the posters above had linked to close alternatives. Ideally I would like it to be the same as the others. Maybe not possible given it is approaching 20 years old?

Of course, you can always wind your own inductor:
http://www.circuitstoday.com/how-to-...-core-inductor

It will stick out like a soar thumb though compared to the rest.

Simon

Originally Posted by simonl

Of course, you can always wind your own inductor:
http://www.circuitstoday.com/how-to-...-core-inductor

It will stick out like a soar thumb though compared to the rest.

Simon

Hi Simon,

I'm inclined to agree with you ! Its not a difficult task.

Based on the OP last post it seems to have got hot enough to just melt the plastic case and unsolder itself from the board without doing any real damage.

Originally Posted by variant22

Thanks for the explanation Ray. I had no idea what it was. It melted and was hanging off the board. In the usual rush to get things running I clipped some of the covering and soldered it back in plate. No problems despite grinding a few things. I will replace it however as it's not right to leave it in that state.

PS: It has been a bit of a distraction from the Boley.. hoping to get back onto it this weekend!


I am happy for you to supply the link to the direct replacement I have not been able to find the exact same type. Some of the posters above had linked to close alternatives. Ideally I would like it to be the same as the others. Maybe not possible given it is approaching 20 years old?

Hi,

This is the nearest that I could find ! A bit pricey though. I would think it unlikely that you would get a similar looking part. Still 10 uh is 10 uh

http://uk.rs-online.com/web/p/leaded...7469616C26706D
3D5E5B5C707B4C7D5C707B4E647D5C707B5A737D2D2C2F255C2E5D2B2426706F3D3926736E3D592673723D4175746F63
6F727265637465642673613D3130756820617869616C20696E647563746F72732673743D4B4559574F52445F4D554C54495F4
14C5048415F4E554D455249432673633D592677633D4E4F4E45267573743D313020756820417869616C20696E647563746F727326

Watch out for the wrap ! It might just be easier to go to RS web site and search.

I have a number of 10 uh chokes, unfortunately they are not encapsulated and are rated for 10 amps. At one time I had hundreds on stock some from WW2 that were used in transmitters.

Here's three you could use from RS in Australia, so you should get free delivery. I forgot to see if they were in stock

http://au.rs-online.com/web/p/leaded-inductors/7361015/
http://au.rs-online.com/web/p/leaded-inductors/8523680/
http://au.rs-online.com/web/p/leaded-inductors/0228141/

Check the dimensions and see what fits best. Check the lead diameter unless you want to drill the pcb hole.

You need to register with RS and I can't remember if they need an ABN but you can get those for free online but leave it a while and just change your mind about setting up a company. I think after three years they took my abn back because I hadn't used it.

Watch out cos I noticed one was in a bag of 5 but they always price by component. When you check out nowadays its obvious if you got it wrong by the price, but in the old paper days before computers, mistakes were made! In my youth, I remember someone ordering 100 x m6 nuts, and got 100 bags of 100 nuts. Not surprisingly, they didn't all fit into the little plastic drawer for M6 nuts in the test room store.

Unless things have changed in the last year or so, you don't need an ABN to register an account with RS. I have an account with them and I didn't need a Co. name or ABN. Last thing I bought was a magnetic reed switch. It cost $7 and it was free delivery, very reasonable! It's worth setting up an account.

Simon