locoboy
|
| posted on 12/3/09 at 01:43 PM |
|
|
110v site transformer
Guys i have bought a 110 site chop saw on ebay and it needs a transformer to power it.
Does anyone have one spare for sale?
Also there seems to be quite a range of load ratings about for these things, anyone know how i find out which one is best suited to running the
saw?
Im seeing things like 3.3Kva, 5Kva........means nowt to me but i dont want to damage either the saw or the transformer so i need to get the right
one.
The saw has a 1600W motor if it makes any difference.
ATB
Locoboy
|
|
|
|
|
dhutch
|
| posted on 12/3/09 at 02:00 PM |
|
|
kVA is kilo volt amps.
For a purely resitive load (light bulb) this is directly the same as kW (kilo watts) P=VI if you remember anythin from physics lessons.
However for capacitive or inductive loads (inc motors, microwaves, etc) they arent quite the same.
I dont know what the powerfactor (diffence between kVA and kW) for the saw would be.
- I would be happy running a 1.6kW saw of a 2.5kVA transformer, although no doubt someone who actaully knows whats standard practice will be able to
advise better.
Also, obvisouly, a local source is advisable as the postage will be huge on what is basicaly a block of iron and copper.
Daniel
|
|
|
matt_claydon
|
| posted on 12/3/09 at 02:01 PM |
|
|
For DC Volts*Amps = Watts so kVA would be the same as kW. However, for AC the relationship is not so simple and depends on the type of load. Generally
you include a 'power factor' so
Watts = VA * Power Factor
The power factor depends on the type of load - for a resistive load like lights or a heater it would be near enough to 1, but for an inductive load
like a motor it can be a lot lower. 0.6 is generally used as a good average for motors etc.
In you case therefore you need a transformer with a rating of at least 1600/0.6 = 2700 VA or 2.7kVA.
That is the theory, I don't know what general practice is in reality though.
[Edited on 12/3/09 by matt_claydon]
|
|
|
BenB
|
| posted on 12/3/09 at 02:33 PM |
|
|
quote:
Originally posted by matt_claydon
That is the theory, I don't know what general practice is in reality though.
[Edited on 12/3/09 by matt_claydon]
If the transformer blows up or melts you need a bigger one?
|
|
|
adam1985
|
| posted on 12/3/09 at 04:47 PM |
|
|
ive got the small one from machine mart and its fine for everything a use ie drills saws core drills lamps i think the only time it would have
problems is if i used alot of tools at the same time with it but its got a reset button anyway so you would know when its at its limit
|
|
|
