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Re: In my welding m/c Earth cable sime times brunout
Was that "the earth cable burns out"- earth cables will burn out due to
1] the connections are loose and
2] the size of cable being used is too small,
increase the size of the earth cable, many manufactures fit a very thin cable to the set which are cheep and nasty, depending on the amperage used multiply by 11/2 times, tell your supplier what the sets maximum amperage on the set and he will give you the correct size. don't get it to long, and always get copper cable not aluminum.this also applies to the welding cable.
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Sounds like an internal problem. You will probably have to take the casing of the welder off and examine all your wire sets. It could be something simple as a connection issue. The transformer may have blown as well.
NO an Oil pressure switch, generally has one terminal as Earth, and the "Other" terminal, is Positive. Often, they are marked, on the item, but, anyway, there is no polarity. Always check, with your meter to see that it's got no shorts to earth.
wire the 3 hot phases to the power terminals on the welder,do not hook the earth to the welders neutral terminal,ground it to the welders case and ground it back to the panel,this way if your using a delta system the 3 phases will balance themselves,but if you hook the neutral terminal up to the welder you'll have what they call the "wild-leg" on one phase and it will be considerably higher voltage than the other 2 phases
check your input power connections on the primary side of the welders transformer, then if its an infinite control welder check that control,otherwise if it's a plug- in selectable amperage check these connections,it sounds like the infinite control is getting dirty and not passing all the current it shows on the control, also double your O.C.V. on the secondary and see if its with-in welder specs
My name is rob, lets see if we can solve your problem
If the welders been working ok first question is what has changed, has it been moved or modified in any way?
Next, are ther any fuses or breakers fitted? are these ok?
Next, most engine driven welders have one major problem.
It shakes stuff loose, undos connections and damages static components,
Take some covers of to expose the internals and with THE ENGINE STOPPED check along the length of the cable harness especially at the ends of cables, give each terminal a tug with the cable to make sure there are no problems there. Also check the condition of the insulation of the harness along its lenght. at this point you may find a "hidden" in-line fuse somewhere in the harness if your lucky!
If none of this helps it gets a little more tricky, could you give me make and model? that would help a lot.