Sven Wesley pravi: > I have a strange behaviour on a machine. I have a breakout board (Rutex > components), when the EMC2-computer starts the mill motor will start right > away. When I start EMC2, it stops. The odd thing is, when I exit EMC2 the > motor will stay off. > I have tested both active high and low, could it be a "leaking" output pin? > I guess it might be fixed with a grounded drop signal resistor. What do you > think? > > Regards, > Sven > That's pretty normal. (sadly). When you start computer the BIOS check port and that's set's some random data at the port. The spindle cannot be (safe) controled by lpt port. It's needs another layer of safety.
The easyest and safe is chargepump. So to run the spindle the PC must output stream of pulses long enought to energyze relay. In hal is chargepump component so it's easy to use it. The hardware to do that is in most cases just two diodes and two capacitors added into circuit. I use two of such relay's (with chargepump) One is for turning on the driver power supply Other is for turning on router. The Estop switch (NC) is wired to power relays. So to turn on the standar procedure is Relase Estop (before or later turning on EMC computer / doesn matter) Hit F2 to turnon chargepump for relay1 and realy turnon power for motors relay 2 is under M3 M5 control. so if computer hangup the power for spindle and motors are cutoff same if the estop is pushed. Don't use direct signal from port to turn on board/spindle. Just imagine that you have manual toolchange and just changing tool and there is power glitches just long enought to reset pc. (and turn on the spindle with your hands on it.) aniway the cnc controller should shut off in that condition but I didn't see that in smal benchtop machines. Not good news for our fingers. Slavko. ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
