Plasma Cutter burnt up a resistor, need to identify it.

[tallfescue]

Hello, I have a plasma cutter which is made in Italy. When using it, it produced two loud pops. I opened it up and found these two resistors blown up. I cant seem to find them anywhere. Can someone help me read the values of these things (I don't know anything about electronics) And where I can buy a similar or compatible product.

Thank you very much.

 

[jackorocko]

Is the company still in business that makes the plasma cutter? I would assume they could tell you the required part value.

The question is why did they blow? Had to be excessive current due to what? Did you double check them with a meter to make sure they where open?

 

[jackorocko]

http://www.ebay.com/itm/ATE-RB50-47K-J-1200-RESISTOR-NEW-QTY-1-/140591998038

So from the looks, the 1R0 is the resistance value, looks like the RB is the series and the 50 is the wattage. Someone with more expertise will back me up on this, but I am pretty confident that is what you need.

edit: Yep, I was right! http://www.ate-electronics.com/index.php/en/products/rb-series Replacements if they are 1 Ohm http://search.digikey.com/scripts/dksearch/dksus.dll

 

[tallfescue]

Is the company still in business that makes the plasma cutter? I would assume they could tell you the required part value.

They are no longer in business from the research that I have done.

The question is why did they blow? Had to be excessive current due to what? Did you double check them with a meter to make sure they where open?

Not sure why they blew, I was using using the torch, cutting metal, and then I herd two loud pops. I'm not sure what you mean by checking them with the meter to see if they are open. I have a meter, but very little knowledge in electronics. I'm a fabricator/ mechanic.

 

[jackorocko]

Did you double check them with a meter to make sure they where open?

do a continuity test. Set your meter to the Ohm setting, is normally green label. Put the probes on the resistor and check the value. An infinite amount of resistance means they are "open circuit" and have failed. current only flows in a closed circuit. If you get a value less then infinite, then what is that value?

 

[tallfescue]

http://www.ebay.com/itm/ATE-RB50-47K-J-1200-RESISTOR-NEW-QTY-1-/140591998038

So from the looks, the 1R0 is the resistance value, looks like the RB is the series and the 50 is the wattage. Someone with more expertise will back me up on this, but I am pretty confident that is what you need.

edit: Yep, I was right! http://www.ate-electronics.com/index.php/en/products/rb-series Replacements if they are 1 Ohm http://search.digikey.com/scripts/dksearch/dksus.dll

I have seen those resistors on eBay, and I have previously contacted this seller about it. But he doesn't have the exact ones that mine are calling for.

The other link you provided contains lots of information, and I dont know what I'm looking for...any other link where I can order a compatible item? Thanks again.

 

[tallfescue]

do a continuity test. Set your meter to the Ohm setting, is normally green label. Put the probes on the resistor and check the value. An infinite amount of resistance means they are "open circuit" and have failed. current only flows in a closed circuit. If you get a value less then infinite, then what is that value?

I did this, I get a value of 0, or closed circuit I assume.

 

[davelectronic]

That is a pair of 1 ohm 50 watt aluminum clad power resistors. 1R0 = 1 ohm, the power rating 50 is on the case, ive used these resistors.

 

[davelectronic]

Hi again. Download the PDF components file from ESR. Electronics, they stock your resistors, and will ship around the world.

http://www.esr.co.uk/components/index.htm

 

[tallfescue]

Hi again. Download the PDF components file from ESR. Electronics, they stock your resistors, and will ship around the world.

http://www.esr.co.uk/components/index.htm

Thank you so much. So I need two resistors of the following value: 1ohm 50 watt.
I'm in USA, and was looking at mouser.com

Could someone tell me if this resistor will be compatible to the ones I have?
http://www.mouser.com/ProductDetail...GAEpiMZZMtbXrIkmrvidKzXrWGN%2biMBUFsGlNR8xd8=

 

[davelectronic]

Absolutely fine, the same component, but closer to home.

 

[jackorocko]

Thank you so much. So I need two resistors of the following value: 1ohm 50 watt.
I'm in USA, and was looking at mouser.com

Could someone tell me if this resistor will be compatible to the ones I have?
http://www.mouser.com/ProductDetail...GAEpiMZZMtbXrIkmrvidKzXrWGN%2biMBUFsGlNR8xd8=

Be better off going with the TE con. on digikey, they have the same flange as the original. http://search.digikey.com/us/en/products/2-1625984-2/A102158-ND/2055334

digikey is in USA, ND to be exact. I use them exclusively. 2 day shipping most anywhere.

sorry my first link somehow got messed up.

 

[tallfescue]

Thank you guys, I am getting closer to having my question answered, and will be placing my order soon with digi key.

Another question: it seems that these two resistors are connected in a series. Why not just get one resistor with double the value -- I assume in this case 2 ohm, 50 watt? What is the benefit of having 2 over 1 resistor, or a greater number of resistors over a fewer number of resistors?

 

[davelectronic]

I am not sure if 100 watt aluminium units exist, and one end of your resistors is connected, the other end is not in the picture, so they could have been parallel or series orientated. But i would think parallel. Thinking about it 100 watt units probably do exist, it could have been anything from manafacturer avalibility, or cost etc.

 

[jackorocko]

What is the benefit of having 2 over 1 resistor

price is mostly why they do this sort of thing. Availability of parts is the second most reason. I am with you though, it looked like it was wired in series. One side was connected to the other side of the second resistor. The sides missing the wire is where I assume you disconnected the resistors (In other words, you didn't touch the side where the wire is still connected?) Then it was wired in series.

 

[tallfescue]

price is mostly why they do this sort of thing. Availability of parts is the second most reason. I am with you though, it looked like it was wired in series. One side was connected to the other side of the second resistor. The sides missing the wire is where I assume you disconnected the resistors (In other words, you didn't touch the side where the wire is still connected?) Then it was wired in series.

Correct, I did not touch the connected contacts.

 

[tallfescue]

I want to thank everyone for helping me in this matter. My didi key order came here Tuesday. As you can see from the pic, part is nearly identical to my original. Installation went smooth. Plasma cutter fired up and working. Thank you again, Merry Christmas and a Happy New Year !!!!

 

[(*steve*)]

Good job

 

[davelectronic]

Glad your getting it running again. Merry Christmas and a Happy new year to you.