Running temperature

[ssiewert]

Clipped.


The PLC is tested to withstand the following environmental stress:

a. Storage temperature: -20 to +85 degree C
b. Running temperature: 0 to 70 degree C.

So, I'm curious about winter operations.   The FMD88 sits in a plastic Nema 4x enclosure, which to some degree insulates the internals from outside cold.  Since it operates irrigation equipment, most of the use is not during the winter.   Is low temperatures harmful, so I need to add heat or shut down the system?  Or are low temps more just a inconvenience, say they make ADC's less accurate ?   ADC temps are likely the one thing that would still be of interest in the non-irrigation season.

[support]

The PLC storage temperature is rated at -20 to +85 degree C. If it is contained inside an enclosure that's all good.

In fact most of the components including the CPU, with the exception of 2 or 3 ICs on the PLC are rated below -20 degree C. Those components rated for > 0 degree temperature may or may not work when operating at lower than rated temperature. But they will not be damaged when stored at - 20 degree C.