2012/12/6 Peter C. Wallace <[email protected]>: > On Thu, 6 Dec 2012, Viesturs L?cis wrote: > >> Date: Thu, 6 Dec 2012 22:14:16 +0200 >> From: "[UTF-8] Viesturs L?cis" <[email protected]> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <[email protected]> >> To: "Enhanced Machine Controller (EMC)" <[email protected]> >> Subject: Re: [Emc-users] 7i39 error >> >> 2012/12/6 Peter C. Wallace <[email protected]>: >>> On Thu, 6 Dec 2012, Viesturs L?cis wrote: >>> >>>> Date: Thu, 6 Dec 2012 21:29:35 +0200 >>>> From: "[UTF-8] Viesturs L?cis" <[email protected]> >>>> Reply-To: "Enhanced Machine Controller (EMC)" >>>> <[email protected]> >>>> To: "Enhanced Machine Controller (EMC)" <[email protected]> >>>> Subject: [Emc-users] 7i39 error >>>> >>>> Hello! >>>> >>>> First channel on 7i39 card is not spinning motor - motor just >>>> oscillates on place. Connecting the motor to other channel makes to >>>> turn correctly. >>>> >>>> I checked the wiring with multimeter, it was ok. >>>> I tried also with bldc cfg=h and with cfg=n, it just does not spin, >>>> but it did in the morning with cfg=h, which made me think that there >>>> is a problem with encoder signal. >>>> >>>> I would appreciate any suggestions on possible cause of problem. >>> >>> >>> I would verify the encoder and flat cable first >>> >>> another test is to disconnect the PID loop, set a small output voltage (bldc >>> value = .1 or so) and slowly change the angle. >>> >>> You can also verify the 3 phase 7I39 outputs with a trio of red/green LEDS >>> with about 2K series resistors >> >> I do not have any motor connected to PID yet, all the bldc instances >> have setp value 0.15 >> When I tried with cfg=n, I had set the frequency = 2. >> >> I suspect that 7i39 card is damaged. >> Regarding that I have a question about attaching/detaching motor and >> some voltage applied to motor power terminals - what is likelihood to >> damage the card, if I plug/unplug motor, when transformer of power >> supply is switched off, but there is still a charge in filtering >> capacitors. > > You are unlikely to damage the card unless you disconnect the motor with > current flowing in the motor. The 7I39 is pretty tough. Only if you can verify > that you have PWM in on all 3 channels and no PWM out would I suspect the 7I39
Ok, thank You! No, power definitely should not be flawing as LinuxCNC was closed so pwmgens were not enabled and 7i39 was not supposed to receive any commands at all. Since it is almost 11 PM for me, I decided to check that again in the morning - I do not feel like able to think very carefully at the moment. -- Viesturs If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
