2010/3/30 Slavko Kocjancic <esla...@gmail.com> > 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. > > I'm not sure I'm following you, it sounds like your solution is a relay that controls a relay, and then the problem remains?.. It sounds like an odd deal that a common breakout board shouldn't handle glitching on/off.
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