On Fri, 2009-10-16 at 16:03 +0100, Ian W. Wright wrote: > Hi, > > I fixed the problem - I hadn't realised that the L297/L298 > board had a current adjustment on it - donhhhh! It must have > been just below a critical value as this morning neither > motor would run on that driver and it only took a little > tweak to get it to drive the motors at full power. It does > have the unfortunate problem of making the motor 'sing' > quite loudly when its at rest but I guess I'll have to live > with that until I can change the driver for something a bit > better..... > > Ian
Singing might be normal. My mill stepper motors sing at rest too. My stepper drivers have a PWM output (for current limiting) at an audio frequency. Even though they are not rotating, the motors are being driven just as hard as when moving. Some drivers will go into a "holding" mode, where the power is reduced after a period of inactivity. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ Come build with us! The BlackBerry(R) Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9 - 12, 2009. Register now! http://p.sf.net/sfu/devconference _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
