Stuart Stevenson wrote: > The 50 ms came from a conversation with Matt in tech support at AMCI. > I wrote it down as he was saying it. He said the converter was > developed in concert with Rockwell specifically to replace the servo > amp I have with a different servo amp. The converter had too much > delay to work in the application it was being developed for. I will > probably try to return them if they will not work. Something is quite odd, here. I can't believe any modern servo amp could tolerate a 50 ms lag. it would require the servo amp to have a bandwidth somewhere around 5 Hz. Even my 1978 Allen-Bradley control did better than that. Ah, yes, I suppose it DID have "too much delay" to work. You probably won't get this info, but it is at least a parting shot across the bow you can throw at them, ask how many of these things they've sold. If the answer is non-zero, ask how many are installed in actual servo control loops. I would make a strong wager that number is precisely zero.
The only possibility I can imagine is the guy who designed this thing had never been told it was going to be used in a servo control loop, and never thought about the delay until the project was done. Then, somebody said "Oh, what is the delay from resolver movement to output", and there were a bunch of "oops-es!" Jon ------------------------------------------------------------------------- This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. 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
