>>I used 12V from PC for 7i76 field power (is it wrong?). In general Yes, but I have done it before to power external 12 volt devices. However, you should really use a separate power supply for field power. If you have a switch turning a relay or coil on and off that is connected to the 12 volt supply and you open the switch; The collapsing magnetic field in the relay will spike the power supply as the switch opens. (Think ignition coil.) You can get around that by putting diodes on your relay coils, but miss one diode and you may still take out your PC.
I would disconnect the suspect power supply and jumper it on and check the voltages at the power supply leads. I think that jumping the green wire to ground (black) will turn on the power supply. (I forget.) Check out the article below. http://www.techrepublic.com/article/troubleshooting-pc-power-supplies/ Dave On 10/2/2014 7:41 AM, Andrew wrote: > Hello, > > I've been retrofitting an old lathe with LInuxCNC. An old 9-step > electromagnetic gearbox was replaced with Toshiba VFS-11, old asyncronous > servo motors got replaced with a couple of newer servos in position mode. > Thus I use 5i25+7i76 on D525MW. First I successfully set up the VFD for > manual 3 step gearbox, then I connected Z axis servo drive and it was > jogging around pretty well. > > The next day I powered up the PC and Z servo drive (but not VFD), the PC > started booting. I remember the boot log appearing and then suddenly the > screen gets black. Since then no picture from that PC, even no bios logo. I > checked the display, the PSU etc with no success. > It looks like the D525MW is dead. Pretty frustrating. > > Here's the first question: could it burn because of some electromagnetic > issues? I used 12V from PC for 7i76 field power (is it wrong?). The > (chinese) servo drive was connected to STEP/DIR in differential mode. The > servo drive is supplied directly from 220V, but it has opto-isolated enable > input, I connected it to GND and one of the field outputs. > > Later I took another D525MW which had been used with 7i43 + 7i48. But > somehow this D525MW doesn't see the 5i25 board. I get "... hm2_pci.ko: No > such device" error. lspci doesn't list 5i25. But the 5i25 lists on another > PC and the config starts OK. > > The second question: what can be wrong with this D525MW? > > Thanks! > --- This email is free from viruses and malware because avast! Antivirus protection is active. http://www.avast.com ------------------------------------------------------------------------------ Meet PCI DSS 3.0 Compliance Requirements with EventLog Analyzer Achieve PCI DSS 3.0 Compliant Status with Out-of-the-box PCI DSS Reports Are you Audit-Ready for PCI DSS 3.0 Compliance? Download White paper Comply to PCI DSS 3.0 Requirement 10 and 11.5 with EventLog Analyzer http://pubads.g.doubleclick.net/gampad/clk?id=154622311&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
