I've been told before by an industrial repair shop that usually the first parts to fail are the electrolytic caps on the old drive boards. Their standard was to replace all of the electrolytics initially and then retest the board. The logic being that if they were not bad, they were living on the edge.
Dave On 7/15/2014 7:23 PM, Leonardo Marsaglia wrote: > Hello to everybody. > > I know this has nothing to do with LinuxCNC but here there is really smart > and kind people so I think you can help me out as usual :). > > We have an old Mazak QT 20 with a mazatrol T1 controller, and a Fanuc model > 15 drive I think. The number on the drive board is A20B - 0009 - 0534. > > >From time to time when I started up the lathe in the morning I got the > ALARM 55 MOTOR OVERLOAD. This happened usually in days with high humidity. > When this happened I ventilated all the cabinetes, wait for a few minutes > and then reconnected the main power switch and the lathe was ready to work > again and the alarm didn't tripped anymore. > > Yesterday the alarm showed up again, but this time more frequently, and > it's impossible to work with the machine. Today the same, I can't reset the > alarm, not even switching off the general switch like I always do. There > are four leds in the fanuc drive board numbered 2 - 4 - 8 - 12 I think. The > 8 and 12 are glowing. I don't have any documentation about this drive, so I > don't know for sure where to start. > > I have to mention that the first day this problem started we had a problem > with one phase in our workshop. The phase was still there, but it couldn't > be detected by a multimeter, anyway the machines were working ok. The > problem was a faulty lamp that was almost shorted. A strange case, in fact > when I used the multimeter to check that phase it showed 0 volts with the > tip of the multimeter in contact, and when I retired the tip, for a > fraction of a second the voltage raised in the multimeter and then droppend > again. I suspect that this has something to do with the malfunction on my > lathe, but I'm not sure, anyway I think it's important to mention it. Now > the phase problem is corrected, but the lathe still has the alarm. > > Well, that's the problem and I don't know where to start (besides from > checking fuses) because I don't have any documentation about this drive. > I'm even thinking in the worst case scenario of replacing the drive, but I > need a hand with that too to identify the wires so the control can work. > > I hope you can give me a hand to diagnose the problem so I can take > measures about it because I need this machine to work. > > Sorry for the long text by I like to be explicit about the problem! > > Thanks as always for your help! > > > ------------------------------------------------------------------------------ Want fast and easy access to all the code in your enterprise? Index and search up to 200,000 lines of code with a free copy of Black Duck Code Sight - the same software that powers the world's largest code search on Ohloh, the Black Duck Open Hub! Try it now. http://p.sf.net/sfu/bds _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
