power supply help please

[mjs79]

hello cnczone

im working on a cnc mill and now ready to pick up a power supply for my servos/drive boards (granite drives) . i need 170vdc and 3 amp output for my power supply with a 120Vac input . where would i find one , or diy plans .
any info would be VERY helpful
please keep in mind im a cnc newbie

thanks alot

mike

[Al_The_Man]

There is many previous posts here on building power supplies. A source of Toroidal transformers is ebay, there is a seller that make them in various voltages.
3 amps does not seem much for servo PS?
Al.

[mjs79]

hello

ill be using 2 200v, 300w ac servos , 1 200vdc max , 450w max for the z axis .
ill be using VSD-A granite drives x 3 /. what amp range should i be looking for .
thanks for any info !

mike

[Al_The_Man]

Ok, with those motors you may be OK, if you are looking for 170vdc as in your first post, then conveniently that would be ~120v AC, so you could get away with a 750va 120/120 isolation transformer, these are quite readily available in the cheaper square lamination type.
Al.

[mjs79]

thanks alot Al for your time , helps me out ALOT .

cheers

Mike

[ViperTX]

Al....I haven't worked with AC servos......but, are they DC compatible?

Thanks,
Paul

[mjs79]

yes they are im sure someone can explan the details , but im not the one .

[Al_The_Man]

Originally Posted by ViperTX Al....I haven't worked with AC servos......but, are they DC compatible? Thanks, Paul

DC, DCBL, AC servo's all need a DC power supply.
They all produce their means of control electronically.
Al.

[mjs79]

hello
one last question . i called around looking for the 750va 120/120 isolation transformer .
i way its was explained to me was it would output 120Vac . dont i need the output to be in Vdc ? im sorry im confused .i found the above listed tranformer for good price , just need to be sure i understand this correct before i spend the cash .or do i need other parts to complete the supply , i have been trying to find the answers but im lost .

thanks for any info to help this newb out

mike

[Al_The_Man]

You need to search here and elswhere for PS building,
You will need to add at minimum, a bridge rectifier and a suitable Electrolytic capacitor.
The bridge does not cost that much, you need a 10amp 250v rating minimum.
And a 250v 2000ufd Capacitor.
Al.

[mjs79]

thanks al i will keep searching and reading , if anyone has any links to help me out that would be great .

thanks
mike

[ger21]

http://campbelldesigns.net/how-to-bu...wer-supply.php