Kirk Wallace wrote: > On Mon, 2008-06-09 at 20:24 -0500, Jon Elson wrote: > ... snip > >>I have another test. Try running the system exactly as it is >>when the inductors overheat, but with the motor disconnected. >>If it still overheats, you can remove C14 and C15 (right near >>the power connector). These are the capacitor part of the >>output filter. Of course, this will allow the servo amp to >>radiate EMI, but it will remove part (maybe a major part) of the >>circulating alternating current from the inductors. >> >>Let me know what you find, I'm still trying to decide if this is >>a major problem in all applications, or only a concern on >>spindle drive applications. >> >>Jon > > > The inductor still heats up with the motor disconnected. I haven't tried > removing C14 and C15 yet. I'll let you know what happens. >
OK, then. This will work, and will allow the inductors to run cool (or at least I have strong reasons to suspect so.) it is a comdination of the low PWM frequency and the continuous operation at higher duty cycles. Hopefully, there won't be interference problems with encoders or whatever. If so, a small 250 V low-loss capacitor would need to be put in C14 and 15. But, you should be able to try it without, first. Jon ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://sourceforge.net/services/buy/index.php _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
