Speaker To-Dirt wrote: > Hey Everyone: > > I ran through the tests in the service manual that you folks said I should > do. My transformer outputs look good. But the quiescent AC current on each > stepper was set at 10.2A instead of the 8.1 - 8.4A called for. Why so > uniform? It almost makes me think that the previous owner poured more current > through these things to make up for old weaker magnets????? No, he probably set it for the local line voltage. If the machine had been running on 208 V it would almost account for the difference. 208/240 = 0.87 and 8.4 / 10.2 = 0.82 Turning up the current won't make the steppers run better, it will make them run worse, in most cases. Oh, one other possible explanation is the current was improperly set by a tech some time in the past. There were some other BOSS motors that did run at 10-11 A. But, if your motors are really supposed to run at 8.25 A nominal, then you had it on a 24% excess, which is a hell of a lot. > Why the uniform values way too high? I tweaked them all down into spec on > the ACC board. I'm testing on air as I write this. I'll test under load > tomorrow. So Jon, thanks to you for driving me in this direction. Now I'm > nervous > Why nervous? Your machine survived something that could have fried a bunch of transistors or even the motors. But, you got lucky and all it did was pop some fuses. It is pretty likely that it will NOT blow fuses any more!
Jon ------------------------------------------------------------------------------ The Palm PDK Hot Apps Program offers developers who use the Plug-In Development Kit to bring their C/C++ apps to Palm for a share of $1 Million in cash or HP Products. Visit us here for more details: http://p.sf.net/sfu/dev2dev-palm _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
