On 24.01.16 12:15, Gene Heskett wrote: > In my case, making that very slow to lock position part of the m5 command > would be one way to stop it quickly as Jon's servo driver, with my > current PID settings, can take it from 2700 to 25 rpm in a very small > fraction of a second. All I hear is a click as I hit enter, and its > running at the new, slower speed. As Jon's pwm servo driver is a true 4 > quadrant controller, that also dumps energy back into the filter banks > in the motor psu, putting the caps well above their surge voltage > ratings. Ditto the reversal in a G33.1, so I don't tap at more than > 200-300 revs in deference to those caps.
Maybe a Transorb across the caps? OK, if the "load dump" duration exceeds the Transorb specs, especially with a boring head in the spindle, then maybe add a slower secondary shunt, e.g. a power transistor with a zener in its base (plus R to Gnd)? ... > I gotta go see if my hand still fits a snow shovel... Er, Gene, is WV West Virginia? Then they're saying here, on the other side of the planet, that you're up to your ... in snow. Might be time to see what rates the local kids are charging, if their hands have ever fitted a snow shovel, that is. Take care out there. (They tell me that white stuff is slippery, as well as cold.) Erik ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
