The Shop > Tools
Running 3ph tools....the cost.....
Darren:
I was reading on "the other site" about some chap explaining the pros and cons of different ways to run 3ph tools on a single phase supply.
It was very long winded thorough, and he totally dismissed Rotary Converters on the grounds of running costs.... :scratch:
Now to my mind there is nothing to worry about as 3 phase motors are quite a bit more efficient than single phase motors. OK you have to add the Rotary costs but together you shouldn't see much of a difference over a single phase motor of the same power output.
This chap was claiming his rotary and machine was costing him about £5.00 an hour to run and as a result he sold his rotary and bought a VFD which he claims is much cheaper to run.
Rubbish, total rubbish. You'll only use what power the motor/s need to run smoothly....At £5.00 an hour I'd sell my machines in an instant....
So I decided to measure my stuff to see what is really going on, like I had nothing better to do but I was now intrigued...
So here's some "measured" facts.....
My Rotary converter, 2.2Kw or 3HP
Mill, 1.5HP 2.5A
Rotary on it's own uses 330W/1.88A
Rotary and mill with the transverse motor also running (2 motors) 720W/5.33A
If you minus the rotary that makes the mill 390W/3.45
At a total of 720W that's around £0.10 an hour.....so 10hrs mill usage will cost me £1.00
Hardly break the bank at that rate would it....
I hope you find that interesting..... :thumbup:
John Stevenson:
But how much does the 240 volt to 440 v brick use ?
Damn hush my mouth shouldn't have mentioned that , 950 brownie points lost.
John S.
Darren:
:lol: :lol: :lol:
That's inc with the calcs for the converter...... :smart:
CrewCab:
--- Quote from: Darren on August 09, 2009, 02:12:44 PM ---I hope you find that interesting..... :thumbup:
--- End quote ---
Very ............. actually, I was wondering earlier ............ while the mill was skimming a long piece of Cast Iron and I had nothing to do except watch the kettle boil .......... again :coffee: ....... dam thing is almost self sufficient :borg:
but, yes that's good to know, ................ I didn't think the overall consumption would be a great deal but it's nice to have it confirmed :thumbup:
I will print this out and go see the Chief Financial Officer (Mrs CC) .............. and once again, ::) explain that the bloomin 2 KW tumble drier, on 24/7 is the problem :wack:
CC
Darren:
--- Quote from: CrewCab on August 09, 2009, 02:22:49 PM ---
I will print this out and go see the Chief Financial Officer (Mrs CC) .............. and once again, ::) explain that the bloomin 2 KW tumble drier, on 24/7 is the problem :wack:
CC
--- End quote ---
I had to laugh, yes I get that very same problem here too.......
"constantly get asked how much "those machines" cost to run.....
My reply....less than the telly......which I don't watch....
Damned thing is on all day, my mill,lathe and everything else maybe 8hrs a week of actual running time....maybe, and that's pushing it....
Do as I did, tell her to go and get one of those digital plug in things that tells you everything you need to know and then some.....
Boy did she have a shock.....shut her up though..... :lol:
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