On 01/22/2016 04:08 AM, 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 That's an amazing device, at that price! Thanks!
> > 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. > > 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. Wire +24 to all clutch and brake coils. Wire -24 to the common terminal on the relay. Wire other ends of all coils to the individual relay terminals. This could require some slight rewiring in the machine. But, most likely, the coils don't care about magnetic polarity, so you can wire them up either way. Just watch out for freewheel diodes, which will care. If your 24 V PSU powers OTHER stuff in the machine, then you have to figure out if going to positive ground will affect any of that. > I also don't think that it is particularly well suited to being driven > by the 7i84 outputs. > Common + on the control inputs, so you need a sinking output on the Mesa boards. And, it needs to be set up to go high or open-circuit on E-stop so it doesn't engage the clutch AND brake at the same time. Jon ------------------------------------------------------------------------------ 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
