If you follow Gene's suggestion, while you are in the unit, check the circuit boards for cracked/stressed solder joints. Over the years, heat cycling will cause joints to crack, especially in areas that generate heat, like around resistors & transistors. Capacitors can also heat up causing cracks. As they age, their ESR can rise, causing more heat buildup.
I have repaired countless items by nothing more than reflowing solder joints! If you are allowing your equipment cabinet to rise to 95 before cooling starts, the localized rise will be much higher. Ray --J. Ray Mitchell Jr. [email protected] (818)324-7573 The dogmas of the quiet past, are inadequate to the stormy present. The occasion is piled high with difficulty, and we must rise with the occasion. As our case is new, so we must think anew and act anew. We must disenthrall ourselves, and then we shall save our country.*Abraham Lincoln <http://www.quotationspage.com/quotes/Abraham_Lincoln/>*, *Annual message to Congress, December 1, 1862* *16th president of US (1809 - 1865)* On Tue, Aug 2, 2016 at 10:45 AM, Rick Lair <[email protected]> wrote: > I am wondering if it just temperature related, I will have to turn the > AC unit back on, and put a temp sensor in the cabinet, and see if I can > get a common trip temperature maybe. Dropping the cabinet temp 20 > degrees has got to make some stuff contract a little bit, maybe enough > to make a crappy connection on the circuit board if it is a cracked > resistor or capacitor?? > > > > Rick > > On 08/02/2016 11:56 AM, Leonardo Marsaglia wrote: > > On the Mazak lathe I often have problems with the drives tripping out > when > > there's high humidity levels (85% and up). In fact, the drive doesn't > want > > to turn on at all, whenever I turn on the machine it's on fault state. > Most > > of the time it happens on one of the drives, but if the humidity is too > > high, both of them are tripped. This one only has fans but no air > > conditioning system. > > > > I don't believe that a low humidity enviroment could cause the problem, > but > > I'm just guessing. > > > > The same machine had a Fanuc 3 phase AC drive for the spindle. That one > > tripped out from time to time, but worked ok. One day, it started to trip > > several times on the day, until finally we never could make it work > again. > > Apparently the problem was on the main board, because everything else on > > the power stage was just fine. We replaced the drive because a Yaskawa > > drive was cheaper than the main board only. > > > > > > > > 2016-08-02 12:39 GMT-03:00 Rick Lair <[email protected]>: > > > >> Hello Guys, > >> > >> I have a Fanuc triple axis servo drive on one of my machines, and since > >> last Thursday it has been randomly tripping out, and faulting the cnc > >> control. It is from roughly 1995, and has been running just fine up > >> until this point. Even while just sitting powered up, but with no servo > >> motion commands it will trip out and shut off the machine. I noticed > >> though, that when the cabinet doors are shut, it trips almost all the > >> time, when I open the cabinet doors, it has been running since Friday, > >> only tripping just once, early yesterday morning. The cabinet is air > >> conditioned, and had the thermostat set at 95 degrees for the point to > >> turn on. We turned it down, to 75 thinking that would help, but I think > >> it actually made it worse. Would there be any way that on an old PCB, if > >> something was going south on it, a humidity level that was too low could > >> cause something to not work, and when it is hot and humid, it would > >> function properly? > >> > >> Here is a link to an identical PCB, > >> > >> http://www.fanucworld.com/media/image/800/0/A20B-1001-0770%20Front.jpg > >> > >> -- > >> Thanks > >> > >> > >> Rick Lair > >> Superior Roll & Turning LLC > >> 399 East Center Street > >> Petersburg MI, 49270 > >> PH: 734-279-1831 > >> FAX: 734-279-1166 > >> www.superiorroll.com > >> > >> > >> > >> > >> > ------------------------------------------------------------------------------ > >> _______________________________________________ > >> Emc-users mailing list > >> [email protected] > >> https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > > > > > -- > Thanks > > > Rick Lair > Superior Roll & Turning LLC > 399 East Center Street > Petersburg MI, 49270 > PH: 734-279-1831 > FAX: 734-279-1166 > www.superiorroll.com > > > > ------------------------------------------------------------------------------ > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
