Peter Homann wrote: > Hi Lester, > > The DigiSpeed-GX board contains an isolated 5V to 15V dc/dc converter. It > accepts a PWM signal and converts it to an isolated DC control voltage > suitable for Asian DC motor controllers, and VFDs. > > http://homanndesigns.com/store/index.php?main_page=product_info&cPath=1&products_id=21
Yes Peter - in which case one could just use a C1G and a DigiSpeed board rather than the C11G which was being discussed. Actually that IS a smaller, tidier solution - just requires ordering from multiple suppliers :( > Cheers, > > Peter. > > Lester Caine wrote: >> Kirk Wallace wrote: >>> On Wed, 2007-12-26 at 21:07 +0000, Lester Caine wrote: >>>> Kirk Wallace wrote: >>>>> On Wed, 2007-12-26 at 17:22 +0000, Lester Caine wrote: >>>>>> Geert De Pecker wrote: >>>>>>> I probably wrongly assumed that the voltage should come from the KBIC >>> ... snip >>>>> How much adjustment will the potentiometer give? Thanks. >>>> http://cnc4pc.com/Tech_Docs/C11G_&_SIEG_X3_Electrical%20storybook.pdf >>>> Check out page 7. >>>> The thing to remember here is that the motor control pot on the Asian >>>> mills is >>>> at mains potential, so you need a totally isolated supply to drive that >>>> bit of >>>> the circuit. The boards I've played with a have a reasonable range on the >>>> pot, >>>> but I've only dropped to +9V from about 11V did not check how much further >>>> it >>>> would go. >>>> >>>> The NEW boards from cnc4pc don't have the +12V requirement on board, so a >>>> +5V >>>> to +12V module may be required. The on board 12V relay has been replaced >>>> with >>>> a 5V one so the whole board just runs off 5V now. >>> Thanks for the information. Does that mean there is a high common mode >>> voltage (AC or DC) on the two pins next to the DC converter? Is the >>> motor controller like the speed controllers for universal motors, or Do >>> you have any keywords to search on the type of motor controller this is? >> YES - basically controllers that only have a control pot on the machine are >> likely not to be isolated from the main supply, and that is the reason this >> little isolated control was provided. Controllers that actually have a 0 to >> 10V DC input are more than likely not to require additional isolation as the >> controls are already earthed (and in which case the isolated +12 can be >> dropped altogether - just provide an earthed +12V). It is just the motor >> controllers that do not provide an 'official' DC control voltage that need >> care. -- Lester Caine - G8HFL ----------------------------- Contact - http://home.lsces.co.uk/lsces/wiki/?page=contact L.S.Caine Electronic Services - http://home.lsces.co.uk MEDW - http://home.lsces.co.uk/ModelEngineersDigitalWorkshop/ Firebird - http://www.firebirdsql.org/index.php ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2005. http://clk.atdmt.com/MRT/go/vse0120000070mrt/direct/01/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
