On Friday 22 January 2016 05:08:32 andy pugh wrote: > I was having trouble sleeping last night, I was obsessing about CNC > machine wiring. > In an attempt to break the cycle I went on eBay and bought > http://www.ebay.co.uk/itm/291551363807 > > In the cold light of day I think I made a mistake. > > I wanted to control the two clutches and the brake on my lathe > gearbox. These have a single wire to a brush (24V) and return via the > machine frame.
Ugg return by machine frame doesn't fit with that w/o the -24 supply. OTOH most of the switchers don't care which output is grounded, so some cheapy thing with enough current could sneak into a corner someplace. But I have an allergy to low side switches, too much stuff is hot and subject to accidental grounds enabling something you THINK is off. Was there not a high side switch like it available? > > I don't think that this device can be wired to operate them unless I > create a separate -24V supply by wiring the +24 of a PSU to the > machine frame. > I also don't think that it is particularly well suited to being driven > by the 7i84 outputs. It doesn't say what the activation current is. Major lack of data so you'll have to test it at 5 or 3.3 volts on arrival. If it works on the logic level input, and you do have something that can be controlled by a low side switch, it might be usable. Cheers, Gene Heskett -- "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> ------------------------------------------------------------------------------ Site24x7 APM Insight: Get Deep Visibility into Application Performance APM + Mobile APM + RUM: Monitor 3 App instances at just $35/Month Monitor end-to-end web transactions and take corrective actions now Troubleshoot faster and improve end-user experience. Signup Now! http://pubads.g.doubleclick.net/gampad/clk?id=267308311&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
