Voltage from 110 to 220

[QTR55]

Hi

I purchased this machine G0619 6 "x 21" Mill / Drill

is working on 110v I want to work on 220v power

I want to change

Voltage from 110 to 220

[Al_The_Man]

Originally Posted by QTR55 is working on 110v I want to work on 220v power I want to change Voltage from 110 to 220

I think you mean from 220 to 110?
A suitable mains transformer, the size (VA) will depend on what the current the machine draws.
Al./

[QTR55]

Originally Posted by Al_The_Man I think you mean from 220 to 110? A suitable mains transformer, the size (VA) will depend on what the current the machine draws. Al./

Hi
our current is 220 and i want u to advice me what is the suitable transformer to my machine wich can fit for it without any problems caus i order additional kit( Small-Mill Deluxe CNC kit PREMIUM BALLSCREWS ) the machine draw is 110 according to the american current and if its possible to email me the ful nam of the suitable trans who can fit correctly without any problems.
waiting for your reply.Thank you.

[Al_The_Man]

See reply to your other post.
Al.

[wildwestpat]

Hi QTR55

Transformers are readily available and are known as site safety transformers. There are some auto transformers that do not provide isolation and also suffer from poor load regulation. Here a link to safety transformers in Quattar from RS On Line but it would be worth while asking at a building tools supplier locally as they may be cheaper.

http://qa.rs-online.com/web/search/s...duct&R=2604288

Select the transformer for the power rating of your total load and pick the size above not the size below. These site transformers are robustly cased and do not need extra protection.

I use a 1500 watt one to power 115 volt tools here in the UK where our public supply is 240volts. These transformers are in common use here as health and safty requirements demand them for use on construction sites.

Added by edit. Note these transformers have a half hour rating and you will need to generously up size if you are going to have continuous use. The transforers of this type have an over current and over temperature trip built in. On mine which is an RS supplied one but many years old the trip could be bypassed by altering the wiring under the top plate which is held on with screws. The transformer is in the lower half of the case and is fully potted for damp proofing.

Hope this helps.

Regards

Pat

[QTR55]

Hi
I saw the reply at A1 which u mentioned and actually i have no idea about these transformer so in this case i want your advice and let me know which trans suitable for my machine which i can fit it without any future problemsI m sorry to caus you any headich. Wating for your rply

[Al_The_Man]

You need to obtain the power rating in watts or the current in amps drawn by the machine at full load.
If you have the rated current, it is close enough to multiply by the voltage, in this case assume you want to run a 110vac machine on your 220v service, so you want a 220/110 transformer.
If the full load current draw is 10amps, then you require a minimum of (110x10) 1100va or 1.1kva transformer, allow some for margin, so in this case you could use a 1.5kva size.
I don't know what is available to you there, but if you have access to Electrical contract suppliers, they should be able to provide you with one.
Al.

[wildwestpat]

Hi Folks

Life is a bit more complicated than volts multiplied by amps! The duty ratio needs also to be factored into the choice. Most if not all the '110 site transformers' are rated for half an hour on and half an hour off. The Volt Amp rating method should be OK for a mill as the full power is not demanded on a continuous basis and the motor on that mill will also have a duty ratio. If the transformer is to power other tools then the duty ratio needs to be thought about a little more carefully. For example a band saw cutting strips can see a duty ratio and load that exceeds the half on half off and this means a bigger transformer or one that has some form of air cooling. When you have sorted out the maximum volt mps required and the duty cycle talk to the supplier. The link I quoted in my earlier response covers the derating of these transformers in the data sheet which can be viewed here:-


http://docs-europe.electrocomponents...6b800f953a.pdf

For this type of potted site transformer the derating required is such that for the 1500 watt (Volts x Amps) one that I use a 1000 watts is its safe continuous load. I would not bypass the thermal trip as the transformer is a lot more expensive than the objects I would be machining that might be ruined by the trip cutting off the supply to the motor!

Chose carefully as these transformers will last a very long time.

Regards

Pat