Chris Radek wrote: > Yay, I found my information... > > DC bus unfortunately is 100V so no common step-down transformer will > do it. The amps will do 14A continuous 30A peak, so you really need > quite a few kVA especially if you are running the transformer under > the rated voltage (6kVA + ?). > > Well, a step-down transformer wired for 480 : 120 but supplied with 240 V input, will give 60 V RMS, which will provide 84 V DC. Using a buck/boost transformer you could get somewhere around 84 V RMS to get 120 DC, or any other V you wanted. Since the transformer can stand short surges, you wouldn't need 3 * 30 * 100 = 9 KVA continuous rating. In fact, that sounds like a major hazard, as the motors can only handle that for a couple seconds every few minutes. Does this machine have SEM motors? They are AWFULLY small, and have no special heat removal systems. > If I remember right, the transformer I have waiting for this project > is about 100lb. There is no way it will fit in the existing cabinet. > I do not remember for sure but I think it is a 415 to 120 step-down to > give about 70V. > Too bad it won't fit. I got a Hammond toroid transformer, they have some up to 2 KVA or more. Not junk-shop cheap, though. About $180 each for a 1.5 KVA unit, I got one for Aram Kasparov's CNC box. > >> Do you have any details on the servo amp enable and fault signals? I >> have some info from the theory manual on the R2E3 (BOSS 8), but it is >> not QUITE enough detail to be sure about these. >> > > The fault output is open collector, normal low, goes open on fault. > > That should work nicely to drive the input to an optocoupler, putting the outputs in series for the e-stop chain. > For the enable inputs: "contact closure or suitable active device > capable of sinking a peak current of 20mA and having an offset or > saturation characteristic of less than 0.6V ... between inhibit and > signal common" > OK, a 4-pole relay should do that nicely, or an opto-coupler would work, too.
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