I've fitted Mitsubishi S520S VFDs to my mill: a 0.75Kw for the main drive and 0.4Kw for the table drive. Both have been in use for almost 2 years. A few days ago the table drive suddenly stopped - I had been using it, on and off, for about 2 hours with no problems when it suddenly stopped. The VFD frequency showed 0.0 and no errors. If I switched the motor on, the "Run" light blinked but nothing else happened - the motor wouldn't run. I switched all power off, waited a short while, and tried again, but got the same result. I finished the job over the next few days by manually winding the table. I retried the power drive from time to time, with no success. The job is now finished so I cleaned the mill up and started to look for the fault: the first thing I did was to try again - and it worked! I have no idea what the fault was (is?) so can't really fix it. Anyone got any ideas?
- posted
17 years ago