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Old 07-08-2008, 01:15 AM
 
Join Date: Nov 2005
Location: US
Posts: 32
GBeaman is on a distinguished road
Mori SL-2H...Fanuc 11t. Toasted I/O?

Hi All,
Been a while since I posted here, but I googled my I/O problem and found many others that were finding help here. I have this lathe that is fairly new to me. It came home and ran for a few hours before things went down hill. First off I started with an OT100 spindle alarm that was caused by a "popped trace" on the Spindle drive board. Repaired and the OT100 went away. But now what caused this problem... I go checking N11 and P11 24v source for relays and find weird voltage. Find a bad capacitor and so I replace the bridge rectifier and the cap and the voltage now seems really good 24-25V. While I was there I found several 24v relay coils that were bad (3) and one small printed circuit board with a 24v DIP relay that was "oozing" and cooked also. So I obviously had some serious problems caused by this power source. Now the machine will not come up "ready". The corresponding ready relays aren't getting their "sinking" ground signal from the I/O board. The funny thing is that the ladder shows that they are getting powered. But indeed they never come in. I have jumpered the ground and the relays are brand new. When jumpered the machine jogs, homes, etc.. just fine. I am betting that my power supply to these relays has cooked some components on the I/O board, What do you think? The fuses are good on the board. There does seem to be some Fanuc I/Cs ( the funny looking ones that stand up straight with a single row of pins) that look to have gotten hot. I think the fact that the ladder shows that Machine Ready is being fired, but the relay never comes in, should probably nail it down to this board. If it helps it is an A20B-1000-094. Thanks for your help.
-Greg
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