On Monday 14 January 2013 19:27:59 Ed Nisley did opine: Message additions Copyright Monday 14 January 2013 by Gene Heskett
> On 01/11/2013 11:19 PM, Gene Heskett wrote: > > a 6 pack of the $50 2M542's in my stuff > > > > Zero problems in a year + so far. > > I wonder whether the 2M542 bricks for sale today bear any resemblance to > the ones you have: *all* the eBay listings have the same part number and > description, but different pictures (some of which actually show a "542" > on the brick). Of course, the pictures rarely correspond to the actual > item in the shipping box; it's a surprise every time. > > But you give me some confidence that they'll be serviceable, > particularly for the relatively light duty involved in 3D printing: no > swarf! > > I don't know what voltage the M2 motor power sends to the drivers, but > that's easily swapped out. > > It looks like fun... Voltage would be whatever is being fed to the 'bricks' minus 50 milliohms of on resistance in the H bridge's hexfet outputs. Max volts is 50 for those, max amps is 4.2, chopper regulated at about 20 kilohertz according to the noises I see when I wave a scope probe near by. Min current can be held to an amp or less, don't have the spec sheet in front of me ATM. They do run hotter at lower voltages I would note, less than 24 volts isn't recommended. I wasn't convinced either, so I bought a spare, but its still in the box. If I buy any more, I'd likely buy the 80 volt 7.x amp version as my next project might be a nema 56 to pull logs thru my big bandsaw. But that is still in the mental image stage because I'd first have to pour a slab to support the trackage to carry the log, then wrap a building around it. 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) My web page: <http://coyoteden.dyndns-free.com:85/gene> is up! My views <http://www.armchairpatriot.com/What%20Has%20America%20Become.shtml> Pollyanna's Educational Constant: The hyperactive child is never absent. I was taught to respect my elders, but its getting harder and harder to find any... ------------------------------------------------------------------------------ Master SQL Server Development, Administration, T-SQL, SSAS, SSIS, SSRS and more. Get SQL Server skills now (including 2012) with LearnDevNow - 200+ hours of step-by-step video tutorials by Microsoft MVPs and experts. SALE $99.99 this month only - learn more at: http://p.sf.net/sfu/learnmore_122512 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
