> > Yup, I agree with Gene, if the motor was not spinning AT > ALL, but the VFD or motor was making a whining sound, it may > mean the VFD was only powering one phase winding. > > That would indicate a VFD failure. Did you unplug anything > while waiting for it to cool? Maybe there was a bad > connection. Anyway, either a failed winding or a failed VFD > would be fairly unlikely to just recover on its own, so > that is odd. I did have some brushless servo drives on my > pick and place machine give crazy failures but then start > working OK after a power cycle. Eventually, they failed > outright. My guessed diagnosis was the firmware ROM was > going out, and eventually it caused a power on self test > lockout. >
Hi Jon, I didn't unplug any wire but I did cut off power to the VFD to see if anything changed. I also checked all the wiring and nothing was loose neither on the VFD side nor the spindle side. Could it be coincidence that this behaviour seemed to be solved when I let the spindle cool down? By the way, I forgot to mention. I usually attach some 3d printed impellers to my collet nut to extract more powder when I machine MDF. Today one of those just destroyed itself. I wasn't worried about that because it was no big deal today, It happened before and in a more spectacular way than today, but now I'm thinking the inertia of the impellers blowing into pieces could have damaged a bearing? A snapped carbide bit could do this too? I must point out that all this impeller setup is enclosed with a thick plastic suction cover so when the impeller breaks it doesn't fly all over the place. But this raises the question. Could a bearing be a little bit damaged that it's not that noticeable when cold and I spin it by hand, but when it starts to work it gets really hot and adds up more torque to the motor until the VFD starts to slip and eventually fault itself? I'll check tomorrow if I can notice a substantial difference between hot and cold spindle when spinning it by hand because I don't remember it. I could scope the output of the VFD. I only have two channels available so is a PITA, but I can try and wait for something strange to happen and see if the signal is the problem. I attached a picture of the spindle setup so you can see what I'm doing. This worked well for months so I'm little lost on where I can start to track the problem. El sáb, 4 mar 2023 a las 20:35, Jon Elson (<el...@pico-systems.com>) escribió: > On 3/4/23 14:08, gene heskett wrote: > > Yup, I agree with Gene, if the motor was not spinning AT > ALL, but the VFD or motor was making a whining sound, it may > mean the VFD was only powering one phase winding. > > That would indicate a VFD failure. Did you unplug anything > while waiting for it to cool? Maybe there was a bad > connection. Anyway, either a failed winding or a failed VFD > would be fairly unlikely to just recover on its own, so > that is odd. I did have some brushless servo drives on my > pick and place machine give crazy failures but then start > working OK after a power cycle. Eventually, they failed > outright. My guessed diagnosis was the firmware ROM was > going out, and eventually it caused a power on self test > lockout. > > Jon > > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users >
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