On Sunday 05 March 2017 08:21:05 Ben Potter wrote: > >From: Jon Elson [mailto:el...@pico-systems.com] > > > > > On 03/04/2017 11:37 AM, Ben Potter wrote: > > > Yes, but the same drive connected to the X motor/tacho also runs > > > at max > > speed. Have not tried the X drive connected to the Z motor. > > > Don't, until you have checked the motor for intermittent shorts to > > ground. > > (Since you put the drive back, and it doesn't blow fuses any more, but > spins, this is a bit less likely, but you don't want to risk popping > any more amplifiers. > > > Most likely it was a transistor that failed to the shorted > > condition, that > > has now been blown open. > > Turning the motor by hand with the multimeter attached gives me either > infinity, or 30-35 Mega Ohms between the power input and ground. > > Can't find a dead short - but I'm surprised that I'm getting _any_ > path there. > Your fingers holding the probes would be at least that low. If you get that with clip on jumpers hooking up the meter, I think you found a carbon track. You may, but likely won't find it by dissing the motor But I don't think I'd hook it up to test w/o laying the motor on a sheet of something to isolate it, with a 25 watt lamp between its frame and a known good ground. If the lamp even flickers, you just found the perpetrator. Replace it, along with the blown parts on the board. From a previous message, Maurius may have what you need. > > ---------------------------------------------------------------------- >-------- Check out the vibrant tech community on one of the world's > most engaging tech sites, SlashDot.org! http://sdm.link/slashdot > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users
Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, SlashDot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
