Na 11.9.2010 17:00, Spiderdab je pisal: > Il 11/09/2010 15:08, Andy Pugh ha scritto: >> On 11 September 2010 13:44, Ries van Twisk<[email protected]> wrote: >> >>> It doesn't work, >>> >>> a USB can't be driven realtime. >>> >> Also, I think that they only generally work for printing, (so pins may >> not be individually addressable, and not all pins may be supported) >> >> > Ok, thanks for answering. > now i'm using my old laptop with a P4 on, but it needs a lot of power > from battery. > i need to put this pc in a place with no power, that's the rule.. > > now i'm powering the notebook plus the stepper driving card with four > motors Nema23 with two little inverters (150W) connected to a car > battery (100Ah). > do you like the sistem? :) > > NO.
In that case (mobile setup) I will prefer system without inverters. So If you currently have 100Ah/12V the same energy you get from 50Ah/24V. So just wire as many bateryes in series to get proper voltage for you stepper driver. At least you have choice for 12V, 24V, 36V, 48V ... And you can get regulators from that voltage to laptop voltage. I have HP NX9005 laptop runing EMC2 and that need 2A @ 18V (battery dead-removed). So machine can work best on battery only but the question is what and how to power router. If machine is not big then the router is near all time power eater. Just be careful when calculating power needed to keep you router work. And remember near all power inverter has bad eficiency! If in label say that inverter is 92% efficient that this is true only in JUST RIGHT comsumption. Just for example. I had 1kW inverter with claim 92% efficient. Ind wher I measure that I just discover that efficiency changes from (surprise) 92% to just 40% if I change resistive load from 100W to 1000W. The peak power (92%) I catch at 850W load. And remember in idle time near all inverters took aprox 0.5A. Slavko. ------------------------------------------------------------------------------ Start uncovering the many advantages of virtual appliances and start using them to simplify application deployment and accelerate your shift to cloud computing http://p.sf.net/sfu/novell-sfdev2dev _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
