MK1 Steel router build log 1500x800x200

[JAZZCNC]

Hi JAZZCNC.

About the 2 transformers.
I didnt know a single +/- 600VA would be enough for the 4x 4Amp 4nm steppers.

Didn't want 1.2 kw setup in a single circuit.
You mention startup current, i was thinking about short circuit fires :O

Yes will handle it easily and your not pulling 16A because of the way drives and PSU work together. You'll be lucky if ever pull more than 6A for any period of time.
I've probably built in excess of 100 Psu's and most have run 4 x 4A motors

I have a single fuse D type 35amp @ 225 volts in the main panel for the house.

MCB for the shop power is now16amp B type..

Maybe dedicated in the future for the machine.

I have a cable 4x2.5mm2 + PE/screen from the house to the shop at about 25 meters.
That is 2 spare wires in my book.

So when i bend the rules a little i can run the machine related stuf from a single mcb 16amps, and the lights and other stuff from some other mcb and combine PE.

Maybe i need to install some kinda peak shaving setup to stop the domestic equipment like water cookers an washing machines and dryers from running at the same time...

16a supply is more than enough to run machine and anything attached to ie: Vac,Air etc. Again I've built lots of machines which run from a 13a supply often installed in garages or sheds working along side other appliances like Clothes Driers, Washing machines etc and never have any issues.

I already have a Wago 24v DC 2Amp PSU.
UB1 says 3amps .. i know maybe later ill check if it comes close to 2 amps and upgrade

No the UB1 only requires 0.5A to work, they only recommend 3A to cover all bases so 2A will be more than enough if only powering a few Prox switches etc.

Need to do some dumpster diving for relais
and stuff.

I did some checking on voltage drop for thecy cable and it looks like 4amps @ 10meters 0.75mm2 is <2 volts.

So... one might think 4x0.75mm2 + screen is about right for everything.

Or should i beef up the spindle a little.

0.75mm2 is fine for motors but for the spindle you'll want minimum of 1mm2.

Now for the DIY PSU.


bom list

20.000 uF enough?

What about 2000hr@85

is that a good enough rating?

No need to go so high but won't hurt. I usually use 3 x 4700uF