On Fri, 11 Jan 2008 14:47:44 -0800, you wrote: >FYI, I have a new page on my website containing my notes on the KBIC >motor controller. > >I am starting to think about how EMC could reverse motor direction. > >Maybe a standard H-bridge connected to the armature connections, A+ and >A-? The KBIC manual indicates that the armature output cannot be >disconnected unless the inhibit feature is activated. I would like to >get an explanation why disconnecting the armature, while the KBIC is on, >is a problem. I know SCR's won't turn off until the input voltage goes >to zero, but that happens every 120th of a second. The KBIC seems to >handle decelerations without a problem, so it seems to me, that back EMF >is not a problem. > >For a direction change, I could start with invoking the inhibit, wait >until the motor stops, switch the bridge and finally, deactivate >inhibit. > >In the KBIC manual, I didn't find any information on the U terminal. I >am guessing it is for a braking resistor? > >Any help would be appreciated.
I use KBIC speed control on my mill, I simply reverse the DC output using a 20A DP/DT relay. The only thing to beware of when using computer control via a 0-10V input is the -ve on the KBIC is referenced to mains neutral, and unless you use an isolated step/dir to 0-10V converter like the CNC4PC C6 variable speed control board, your likely to blow something. There are wiring diagrams on CNC4PC's site and there is a warning in the manual that says use ISOLATED reference voltage. If you want to you could use a KBCC-R model if you want true dynamic braking and reversing. Steve Blackmore -- ------------------------------------------------------------------------- Check out the new SourceForge.net Marketplace. It's the best place to buy or sell services for just about anything Open Source. http://ad.doubleclick.net/clk;164216239;13503038;w?http://sf.net/marketplace _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
