Re: [CAD_CAM_EDM_DRO] BP Power supply

Nathan,

Yes the transformer should be the big one :-). Anyways, You'll need to find the primary input and that should be connected to a 110 volt supply unless it was a 220 control. Then you will have a pair or a number of pairs of wires coming off the transformer secondary. With a meter set to AC read the voltages of all. Most old CNC controls had secondary pairs of differnt values. Ok, you want around 55 volts. You can wire these secodary pairs in series to add up to the voltage required which you say is 55 volts. If you have one at 55 just use that pair. If you wire the pairs in series the two remaining wires will be what you take to the bridge rectifier and hook to the two ~ terminal or they may not have anything on them, The other two + and - come off of your bridge and go directly to your capacitor(s). And I have no idea what size caps you need because I dont know anything else about your configuration. Typically for 100 volt servos you would need 100 volt cap(s) and 15,000
macrofarad per axis. And from there you would go to a fuse block and then to the drive and then out to the motors..............................and so on.

Ron

rocketscientistnate <rocketscientistnate@...> wrote:
I have found the bridge rectifiers, and the capacitors, but I'm not
sure where to go from here. I believe I need to rewire a
transformer from 110V to 55V. Is this the big one in the middle of
the power cabinet? How do I go about doing this? Where are the caps
hooked back in? Should the bridge rectifiers to be moved to the
power cabinet and the control cabinet completely removed? I know
some people like to put the pc and contol components back in there,
but I'm going to set mine on a desk nearby. I guess what I'm really
trying to ask is how many of the wires between the two cabinets need
to be disconnected and pulled out?

Thanks again for all the help, you guys are life savers! (or at
least shop savers ;)
Nathan



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