On Saturday 10 October 2009, Hubert Bahr wrote: >Gene >When you say micromill are you referring to the X2.
I think the X2 is this ones bigger brother, selling for about $500, this was the $300 HF version. But I bought the expansion table kits from Chris at LittleMachineShop.com, and made a new z drive, pix at <http://gene.homelinux.net:85/gene/emc> >I have one of these >as well. I am running it with EMC2 though the parallel port with a G540 >driver. It accepts a VFD PWM signal and has an op-isolated 0 to 10 volt >analog output for a VFD. It also has 2 uncommitted output pins. It looks >like I could take the VFD PWM signals in parallel to feed the PMDX-106 >or I may not need it if the VFD output will work for the mill motor >controller. So how did you hook up the VSD to the PMDX. Exactly as shown in the small manual it comes with. The electronic pot on the PMDX-106 replaces the manual pot entirely. But the PMDX-106 can be ordered with its own manual pot, which I got, so I have full manual control in addition to computer control. If push comes to shove, I could take it apart and draw up the hookup but that might be dangerous because the VSD in the X3 is probably a different model. I am one of those who hooks up one wire at a time and rarely draws a working schematic. I'd probably miss lay it a week later anyway. CRS etc. >From a quick >review of the PMDX-106 manual you can use the pot to set the speed >through the PMDX but it uses an analog voltage out to set the VSD speed. >You certainly seem to have put me on the right track. It looks like I >need to break out the meter and read the values across the pot. A meter is _not_ a valid tool there as the voltage there is a very highly distorted AC. Hooking a scope up might be possible but the scope will have to be double insulated, like Phillips made them back in the late 70's. I just assumed that the homework had been done and followed directions as my 100mhz dual trace Hitachi is _not_ isolated, underwriters laboratories apparently having outlawed a very very useful feature. >It is >starting to look like the G540 already almost everything I need except >for the relays and signal conditioning for a sync signal. Reviewing the >StepConf portion of the getting started guide makes me believe I have a >chance for a first order solution in its spindle control section. Down >stream I may want to achieve a more robust solution with something like >the Mesa cards. I used the teeny little relays on the PMDX-106 to run some socketed DPDT P&B relays to do the actual high power switching, 2 of them IIRC. 1 for run/stop, and one wired in the classic x-crossover for direction reversal. A side effect of that which came in handy was that when the run relay was opened, I could use the backside contacts to throw a 10 ohm resistor across the motor coils, stopping it dead in about 2 or 3 revs from full speed. A dead short will do it even faster, but that can also demagnetize the motors field magnets, so 10 ohms was my compromise. I don't think I ever did draw a schematic of that part, but hooking up relays isn't rocket science. Also, do not reverse without letting it come to a full stop first, it will clear the fuse instantly if I forget that little detail. :( >Jon >Warning noted. It looks like my driver may have already considered that >and provides an optical isolated output and uses a PWM input. As does the PMDX-106, needing a PWM input from a verse of hal code, and a reverse pin on the parport. Everything in the PMDX-106 depends on the presence of the PWM from the computer. [...] -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) The NRA is offering FREE Associate memberships to anyone who wants them. <https://www.nrahq.org/nrabonus/accept-membership.asp> Oregano, n.: The ancient Italian art of pizza folding. ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
