industrial welder. any advice

[Davey1988]

Hey guys

I want help on this forum about cpc and I heard I won't get any am I right?

 

[davesparks]

Calculate cpc size using the adiabatic equation, exactly the same as any other circuit.

And put your best tin hat on before anyone else answers this, if you aren't on a wind up you are going to be catching some serious flak!

 

[Davey1988]

Cheers for your help.

 

[D Skelton]

Oh dear God!

Step away from the welder!

Get a qualified lad do do the job, watch and learn.

 

[davesparks]

Aaaaaaand they're off!

 

[davesparks]

Cheers for your help.

So, what answer have you got after using the adiabatic?

 

[Davey1988]

No ze provided and unable to measure. Not sure on the cable sizes yet especially cpc So ain't worked out r1 and r2.

Lovely.

 

[davesparks]

Where's the first post gone?

 

[Davey1988]

To save future embarrasment I deleted it.

2 phases. No neutral. And cpc
80 amp fuses per phase. Max leakage imo can be no higher than 160amp.

First time in dealing with welders not 100%

 

[davesparks]

You've got serious problems if you've got a leakage current of 160A

 

[Davey1988]

Maybee

 

[davesparks]

No, they use the cpc as a cpc and a neutral as a neutral if one is required. It sounds like the machine you have is designed to operate on two phases of a three phase supply, unless of course it's designed for a two phase supply?

You need a lot more than a little guidance, you clearly don't understand the first thing about the job you are attempting to do.

 

[PEG]

thinking worst case senario. Do welders use a cpc to act as a neutral. little guidance is all I need and I'm finding it really hard to get it on here.

Some welders have 200amp - 400amp earth clips.....

I think you are getting confused with the terminology,referring to the OUTPUT side of the machine.

The terms and figures only make sense,if this is the case.

Do a bit of research,and all will become apparent...but do not attempt,if unsure,and some other human is to test its' operation...:conehead:

 

[Knobhead]

Think along the lines of electrode (live) and work piece (neutral return). The I/P and O/P are two separate entities.

Where I’ve seen things go badly wrong is when the CPC has been used for the return. Do some reading on the subject, as a hint, don’t bother looking in BS7671.

 

[plugsandsparks]

Think along the lines of electrode (live) and work piece (neutral return). The I/P and O/P are two separate entities.

Where I’ve seen things go badly wrong is when the CPC has been used for the return. Do some reading on the subject, as a hint, don’t bother looking in BS7671.

Yep, I recently had a call out because a welder had set the cpc on fire in the DB and it even made the trunking rattle, lol. I repaired the circuit and offered to check the welder to make sure it was wired correctly but they thought it was dangerous so the had ditched it before I got there...