Hi V2creative,
as you see the machine is a computers network. for this kind of technology normally you have to pay attention in a good electrical installation following the european electrical norm.
1-first step before installing this machine is to have a ground with a very low resistence lower than 1 ohm
2-the machine must have its own transformator to supply the 400 VAC +/- 5%, if you are in europe you do not need a trafo.
3.-All kind of precision electronic equipment must be protected by at least peak supressors 120 KA per phase with a response less than 1 nanosecond. one at mains switch and another inside the machine after its main switch.
if you follow this rules your equipment must run without any problem!!! and this is not only for manroland machines !!! it is for all industrial equipment !!!
about the rats eating cables, this is a very bad situation , for such problem you must do a very deep inspection for all cables inside machine cabinets, when you found damaged cables the better is order original cables or the cheap option is repair it by an specialist in your country.
best regards