Marcus Most VFD's have a serial communicatiuons interface that normally comply with the MODBUS protocol. And these days most of them have a USB interface so you just plug in and communicate to them. You will find the comms requirements in the manual. Normally the last section in the book. I have not used it this way with LCNC as I have a PWM to Pot converter. It uses the 10v supply of the VFD ans simulates a pot. The PWM is complete isolated from the VFD. I have however done several custom controllers making use of the communications channel of the VFD.
On 2014-02-16 10:09, Marcus Bowman wrote: > On 16 Feb 2014, at 05:07, Jared Turner wrote: > >> I'm still working with trying to get programatic speed control from my BBB. >> My driver requires a 0-10v signal or a 10k pot to control speed. > Interestingly, although these systems are designed around a 10 volt swing, I > have measured the swing on my pot in situ, and it swings 14 volts. I have > spoken to one of the suppliers of the 10 volt boards, and they said they > couldn't give me a board (or a mod) to give a 14 volt swing. I suspect they > didn't think the market was great enough, or just didn't believe me. Whether > the machine needs that extra 4 volts I can't say. Bought a 10 volt swing > board but have not yet fitted it. >> Had to take a break from this - schoolwork is kinda inconvenient at times - >> found out my digital pot can't work for 10v signals... so I'm thinking about >> implementing an op-amp and ramping up the output of the BBB to 0-10v. My >> other option is to connect a servo/stepper motor to a pot which seems a >> little silly. > Yes; I saw that recommendation from a supplier, but I felt the potential > errors and the hardware overkill meant it was not a preferred solution, in my > view. >> I'm just wondering which is easier... >> > Surely it shouldn't be too hard for the electronics chappies to produce a > board which responds to a digital (command) input and outputs a programmable > voltage up to, say, 20 volts. It would be more expensive than the current > boards but much more useful. Or am I missing something? > Could someone not provide a board which accepted a digital (command or code) > input. run it through a map of the volts-to-speed characteristics of a motor, > and output the appropriate voltage (up to the maximum required for that > motor). Working with the existing motor controller, that would give good, > accurate, speed control. > Some inverters already claim to be able to respond to signals from a > computer, so how is that done? > > Marcus >> ------------------------------------------------------------------------------ >> Android apps run on BlackBerry 10 >> Introducing the new BlackBerry 10.2.1 Runtime for Android apps. >> Now with support for Jelly Bean, Bluetooth, Mapview and more. >> Get your Android app in front of a whole new audience. Start now. >> http://pubads.g.doubleclick.net/gampad/clk?id=124407151&iu=/4140/ostg.clktrk >> _______________________________________________ >> Emc-users mailing list >> Emc-users@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ > Android apps run on BlackBerry 10 > Introducing the new BlackBerry 10.2.1 Runtime for Android apps. > Now with support for Jelly Bean, Bluetooth, Mapview and more. > Get your Android app in front of a whole new audience. Start now. > http://pubads.g.doubleclick.net/gampad/clk?id=124407151&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- Regards /Groete Marius D. Liebenberg +27 82 698 3251 +27 12 743 6064 ------------------------------------------------------------------------------ Android apps run on BlackBerry 10 Introducing the new BlackBerry 10.2.1 Runtime for Android apps. Now with support for Jelly Bean, Bluetooth, Mapview and more. Get your Android app in front of a whole new audience. Start now. http://pubads.g.doubleclick.net/gampad/clk?id=124407151&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
