Will the supply handle it :)

[Davek0974]

I have a 32A supply to my home shop, I want to bring my CNC plasma cutter home which has been hiding at work, it uses a Hypertherm 30xp cutter which has a 13A plug on it.

I also need to upgrade my compressor and was thinking of getting the wolf Dakota 3hp which also has a plug in it I'm told.

Plus the lights, CNC computer etc, do you reckon I'll get away with it

Hope so 'cos I've got very few options for an increased supply, although I could possibly run the compressor off the house supply via the garden socket.

 

[DanielW]

Silly question but what rating was it running off in the shop? the plasma

 

[brightspark]

check the input amperage on the cutter data plate .your comp will be about 12 amps running load and about 50 amp start up .u say your supply is 30 amp what size cable is feeding it 4.0mm or 6.0mm cable and how long from feed . it will more than likely cope

 

[wookie]

A quick back of a fag packet calc...

13A plasma + 13A compressor = 26A (although they might need less)

32A supply - 26A = 6A

So in theory you have 6A spare to run your lights & computer, A few strip lights is maybe 1A, the computer shouldn't need 5A but your cnc control box will need a bit.

I think you're sailing too close to the limit, if not over it.

 

[Davek0974]

This is where it gets odd, the Hypertherm manual States 18A max but it comes with a moulded 13A plug!

The compressor is 3hp which is 2.2kw but unknown efficiency etc, I doubt it's running at max loading.

The cable to the shop is 4sqmm I think, was done a few years back but I have data on it somewhere, it's about 15m long

The breaker in the house is 32A

 

[brightspark]

This is where it gets odd, the Hypertherm manual States 18A max but it comes with a moulded 13A plug!

The compressor is 3hp which is 2.2kw but unknown efficiency etc, I doubt it's running at max loading.

The cable to the shop is 4sqmm I think, was done a few years back but I have data on it somewhere, it's about 15m long

The breaker in the house is 32A

u will probably just get away with it as all 3 arent running constantly . u may have to change the breaker in the house to a c type if its fitted with b type just run them and see how it goes it might knock the trip it might not and u cant overload the cable

 

[Davek0974]

Yeah that's my kind of logic

Suck it and see.

I the cable is good for 45A abs max

I think it'll work, the plasma cutter is on a 15m extension cable at the moment and it's still happy, I think the ratings are pretty conservative.

Anyone fitted a soft-start to a compressor? I fitted the Colchester lathe with one as the lights dimmed a fair bit without it when starting her up no problem when running but the inrush is a bitch, mind you that's a good old vintage Compton Parkinson English 3hp motor so probably 10 times more powerful than the new crap.

 

[mike 109444]

Might be worth fitting a small (shoe box ish size) UPS on your pc. If you are getting dips in the mains you are likely to get corrupt/rebooting of your pc. It will act as a buffer.

 

[Davek0974]

Might be worth fitting a small (shoe box ish size) UPS on your pc. If you are getting dips in the mains you are likely to get corrupt/rebooting of your pc. It will act as a buffer.

Good idea.

 

[Davek0974]

Compressor came today, current draw under load is 10A so it's going to be the starting current that blows things if at all.

Will be getting it all home soon so will find out then.