>>I don't like USB much for using with LinuxCNC. The VFD/Modbus components >>work well enough or can be modified easily enough to get what I need. >>Plus I don't know Ladder. >>I have a few VFD's that I run three twisted pair to for FWD, REV, and >>speed PWM. With a micro controller I could get that plus monitor >>frequency, load, and other things with two pair.
well thats interesting! the avr will connect to LCNC through serial port? i like to hear what is the usb disadvantage in this particular application. where i* can find some info about modifying those components (* without much programming skills....) theres a link here: http://wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Modbus but reading somewhere that it is outdated (kirk wrote thats, sure you meet he:) ), im stalled in CL and mb2hal. regards rick 2013/10/3 Gregg Eshelman <g_ala...@yahoo.com>: > On 10/3/2013 10:41 AM, David Armstrong wrote: >> On 03/10/13 17:29, Kirk Wallace wrote: >>> I'm thinking about completing some work I did with AVRs and Modbus by >>> making an adapter that has a Modbus port for a PC connection, with >>> digital and analog IO for VFD control. This could allow one to add >>> Modbus control to a VFD that normally only has keypad or button and >>> potentiometer control. If there is any demand for such a thing, I could >>> have some boards made, otherwise I'll just hack together a few for my >>> needs. Another thought, there are cheap VFDs with Modbus that could be >>> had for not much more than the adapter would cost. Any thoughts? >> i'd be interested >> >> Dave > > I ordered a Teco/Westinghouse JNEV-203-H1 from Wolfman Automation. Cost > less than $300 for the single phase to 3HP 3-phase model. As-is it has > some inputs that can be used fro various things. I plan to connect one > to the spindle control output of my BOB. > > There are various addon cards available, including RS-232, RS-485, > Modbus and others. > > Less expensive than a new 3HP single phase motor. I got the converter > for my mill, will test the 3HP motor in my Monarch 12CK. If the motor is > good I'll get another converter and sell the 5HP 220V single phase motor > I have. > > > ------------------------------------------------------------------------------ > October Webinars: Code for Performance > Free Intel webinars can help you accelerate application performance. > Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from > the latest Intel processors and coprocessors. See abstracts and register > > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60134791&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
