Anyone have any input on overheating PLC's? Shop temps have been achieving 100*F as we start into August, normal for this time of year, but we have automated equipment "going stupid"... The PLC will complete the logic scan as directed, but will not restart the program as directed in automatic mode. It cycles for about 2 minutes as needed/parts loaded. It's a critical piece of the supply chain with a MicroLogics 1200 in a sealed enclosure, it locked up solid for 45 minutes the other day. I opened the cabinet and after cooling with a fan, went back to business as usual. Since then, I have installed a cooling fan on the operator station/electrical enclosure and haven't had a problem since.
keep in mind that I checked inventory, and we do not have a replacement in stock.
I discussed this with the EE, my argument was that a PLC should be able to tolerate 120*F, which I did not actually measure the cabinet temps, but I don't think it was over 120*.... I argued if the PLC was "going stupid" or otherwise overheating after operating for 10+ years in the same exact sealed enclosure, we should at least have a spare ready to change out.
I really didn't find any information on AB's website or manuals regarding overheating, only to avoid it.
Can anyone cite similar experience, or verify that the PLC is on it's way out the door?
Thanks