This post is about fault number 4380 TEMP DIF 3 U. Long history short: clean your air filters. Other cause that I can think of is a hot spot on the connections on top of the modules. Good luck!
To give a little bit of context it must be said that underground mine environment has -despite control measures- presence of dust, humidity and fume due to other equipment operations, ventilation system airflow and others. Additionally, mining is a dynamic activity where you can see your quiet working space transformed into an area fully packed with workers and equipment (and their pollution) in just a couple of shifts.
This was how we ended experiencing fault 4380. An increase in pollution in the area where our beloved ACS800 drive works led to a clogged air filter despite we clean them monthly. Temperature got above failure threshold and voilá there was a new failure what to post about. Afterwards we decided to clean air filters quarterly and so far it is giving good results.
