Speaker To-Dirt wrote: > Hi All: > > Here's my RPC values hot off the line. > > Unloaded Loaded (Manual mill spindle going) > ----------------------------------------------- > 235 V 235 V > 269 V 257 V > 245 V 238 V > > Sorry those old numbers must have been from my RPC build and not the final > numbers after the run time caps were put in. I'm fairly sure that the 257 V > is the co-generated line. I'll have to trace this out. > OK, now this makes sense, you are running one of your stepper drivers on about 12% overvoltage. Depending on what the transformer taps are set to, that may actually be worse than a 12% overvoltage. The drive can probably be set for this voltage, but I am guessing you just left the settings where they were. You may be lucky these fuses were blowing leading you to discover the problem before the transistors started to pop. This much imbalance is not great for the spindle motor, it can be HELL on the electronics.
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