On Saturday 15 March 2014 01:25:47 Peter Homann did opine: > Hi Gene, > > Not sure where you get the $80 rip-off from?
Around 13-14 years ago (before I became aware of emc) Futurlec had a good deal on some pci boards with 3 82C55's on each one that I thought would be good for machine controlling duties. Something in the $39 USD a copy, said to be USD on their web site, so I bought 3 of them. By the time the charges got to my card, they were 80 USD each or about $240 on my card. Emails to futurlec about it were never graced with an answer. The cd with drivers turned out to be source code in visual basic, worthless to a linux guy who doesn't bother to keep his wine install, if I have installed it, up to date. Understandably I've been a bit spooky since. > You can select to see the prices in US$ by setting the currency to US$ > in the top right had side of the front page of my site. > > http://www.homanndesigns.com/store/ > I think it must be the default, it is showing me USD. > 1. The DC-03 has an optional DC/DC converter that generates a 15Vdc > supply that is isolated from the 5V logic supply. The Logic circuitry > is isolated from the "analog" circuity that is generating the control > voltage. > > If you can get the 10-15V supply for the analog circuitry from your > spindle controller you don't need the DC/DC converter. I also have a 15.5 volt supply that I feed the isolated stuff from. But the C41 gets its needed 5 volts from that input with a 7805 on one corner, which runs fairly warm. Essentially everything in the logic runs isolated, with the 2 inputs from the breakout board driving the opto-isolators direct, eg no logic runs at earth ground on that C41 board. > > The logic circuity is referenced to the breakout board logic supply and > is not referenced from it. > > 2. The converter can supply a maximum of 60mA at 70% efficiency. 10mA is > typical. > > Relay Coil current is 21mA each. Another 10-15mA for the rest of the > board. > > 3. The 2 relays are controlled independently of the PWM signal. The set > and release times for the relays are 3mS maximum. That means I'd need another logic signal. With the existing C41, the relay for run/stop, is driven by detecting the PWM presence, so all I need is the PWM and REV signals. I'll have to check as I an not positive I have another unused signal line on the C1G since I am using the probe input as a homing signal with some hal trickery, and 3 other lines are taken up by the spindle encoders A/B/X lines. Those set/release times are great though. I could probably hack up a timer (10 ms retriggerable one shot) to run the run/stop relay input so that doesn't rule it out, just makes it more complex. My .hal file is close to 300 lines to run this 7x12 now. But I do have to have both relays active because when they're off, that brings in the dynamic braking so I can use a G33.1 cycle as a "peck tap" driving it another half a turn per peck. And because that braking is controlled by a wcomp hal module, it uses 2 I/O lines to stage the braking r's depending on the spindle's instant rpm as its slowing. The stopped condition so I can clock the reverse or forward on thru to the output is also detected in the hal file so lcnc can go straight from forward to reverse and back to forward without hammering the motor controller by waiting till its within a few degrees of stopped before doing the direction reversal. The braking R's do get warm. And that goes a long ways toward explaining why the hal file is nearly 300 lines. :) Humm, thinking out loud, the PWM signal from the C1G can source or sink 24ma. Could I sense the PWM with a diode and recover enough to run the run/stop relay? That would be quite simple with a .2 uf paper to bridge the off times in the duty cycle of the PWM. Would that be feasible? > Cheers, > > Peter > > On 15/03/2014 3:13 PM, Gene Heskett wrote: > > On Friday 14 March 2014 23:53:24 Peter Homann did opine: > >> Hi Gene, > >> > >> Have a look at the DC-03 Digispeed that I design and sell. It > >> converts a PWM signal into an isolated control voltage, and has > >> quite small form factor. > >> > >> http://www.homanndesigns.com/store/index.php?main_page=product_info&c > >> Pat h=1&products_id=21 > > > > 3 concerns with the -03 Peter (besides the ripoff when converting AUD > > to USD, usually resulting in at least an $80 charge). > > > > 1. I read it that it has a builtin charge pump to make the 15 volt > > isolated supply from the 5 volt input, and that the 5 volt supply > > isn't isolated, only the 15 volt and associated circuitry. Correct? > > > > 2. In that case, how much power does it need from the 5 volt line when > > that 15 volt generating charge pump is running? > > > > I can get 5 volts from the C1G breakout but that is fed from a lm317 > > bolted to the box the drivers & motor supplies are in. A relatively > > massive heat sink, but gets up to about 115-120F on a warm day. If > > your 5 volts needs 250 mills because its also running the relay > > coils, that will probably mean another LM317 will need to be > > provided. > > > > 3. One last Q since the drawings in the pdf do not say, nor does the > > text. > > > > That is, does the run-stop relay effectively operate by presence or > > absence of the PWM signal? How much lag in that event? > > > > Thanks Peter. > > > > Basically trying to figure how best to make it a drop in for the C41, > > but one that works a heck of a lot better. > > > > Cheers, Gene 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) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
