Iron Mountain, MI
I am trying to replace a pot on a mig welder. The markings on it are 2k2 647M. I figure the 2k2=2,200Ohm. Any input on what 647 means?
Thanks for any help
(Topic ID: 139247)
Appears to be a Piher PC-16 potentiometer. Hard to determine the 647M without their secret decoder ring.
Not many Piher distributors in US so may be a difficult one to replace with exact version. You can find a few sizes at Mouser but not proper sizes or pin types.
It has been rough going. No distributers seem to have it in stock. Piher says they will sample but have a $75 tooling fee. Don't want to do that.
Any advice on substitutions that might be acceptable? Yes I am a noob.
This is for the wire feedl speed control pot on a mig welder.
Thanks for any help.
Seriously - why is this a problem? Just get ANY 2K2 pot and stick it in. It will work electronically and you just need to sort it out mechanically so it fits. If it needs to be isolated then buy a plastic knob. If it needs wires run then run them, 3 wires, big deal.
If you can't do this the ask the help of ANY electronics hobbyist.
This isn't rocket science, just a pot for goodness sake!
Quoted from Pinball_4_me:Seriously - why is this a problem? Just get ANY 2K2 pot and stick it in. It will work electronically and you just need to sort it out mechanically so it fits. If it needs to be isolated then buy a plastic knob. If it needs wires run then run them, 3 wires, big deal.
If you can't do this the ask the help of ANY electronics hobbyist.
This isn't rocket science, just a pot for goodness sake!
Awesome! Thanks for the harsh and helpful post! Like I said I am new to this so you will have to sometimes forgive the basic nature of some of my questions.
I understand that "any" 2k2 pot would work, what I did/do not know is if there is a wattage rating that must be satisfied similar to a resistor.... I did not know if that was part of the 647M "code" which appear to be Pihers own in house markings.
Quoted from Pinball_4_me:Seriously - why is this a problem? Just get ANY 2K2 pot and stick it in. It will work electronically and you just need to sort it out mechanically so it fits. If it needs to be isolated then buy a plastic knob. If it needs wires run then run them, 3 wires, big deal.
That's not exactly helpful. I agree in general, but when it comes to things that can cause serious bodily harm and property damage when malfunctioning (say, a welder), the "any old part" isn't a great approach. If Piher or one of the distributors can give you specifications on the part and you can find an equivalent then yeah, that'd work.
If it's causing you a lot of trouble, smailskid, you might want to find an electronics repair place in your area and get quotes on fixing it with a warranty. Fifty bucks isn't worth a mig feed through your glove.
Quoted from Law:That's not exactly helpful. I agree in general, but when it comes to things that can cause serious bodily harm and property damage when malfunctioning (say, a welder), the "any old part" isn't a great approach. If Piher or one of the distributors can give you specifications on the part and you can find an equivalent then yeah, that'd work.
If it's causing you a lot of trouble, smailskid, you might want to find an electronics repair place in your area and get quotes on fixing it with a warranty. Fifty bucks isn't worth a mig feed through your glove.
It is not giving me trouble as with concerned with the mechanical hookup of it. Solder/desolder, running wires etc., drilling holes to remount etc. is no problem. I was just unsure if all I had to match was the Ohm rating to make it work.
As Ed already said, it is a Piher PC-16-series poti.
Fighting with the Piher data sheet, your poti should have the part-number PC16 SV 10 I P06 222A 2020 MTA.
Here is the data-sheet:
http://www.piher-nacesa.com/pdf/20-PC16v03.pdf
Very hard to find the "V"-Type.
So every easily available poti with the values 2K2 and >=0,2W should work.
If you can hook it up mechanical somehow and work with running wires, that should be OK.
If it were mine, I would buy this poti - the same as yours, BUT the "H"-Type and not the "V"-Type.
Very low priced here in germany.
Quoted from smailskid:Thanks for the post GermanPin. Very helpful. I went through the data sheet and saw how you got the part number. I will get this pot and get the welder going. Thanks again to all
Ha - it is a pain, going through this data sheet, isn´t it?? Disgusting!!! You must go to university 10 years before you can unterstand it 
Hope, you get the welder running soon ....
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