The 6SL3230-3YE46-1UF0 pairs 3C3 conformal coating with unfiltered EMC in the 110 kW FSF frame — environmental protection without an integrated EMC filter or operator panel. At 277 A continuous, this variant serves the specifier who needs corrosive atmosphere protection at the power stage but already has harmonic mitigation at the bus level and remote commissioning via the automation network.

3C3 without the filter — the system-level decision

In a large wastewater treatment plant, the main switchboard feeds multiple 110 kW drives through a dedicated transformer with 5% impedance and line reactors on each feeder. The conducted emissions from any single drive are already contained at the bus level — adding per-drive C2 filters would contribute Y-capacitor leakage current with no incremental EMC benefit. The 3C3 coating addresses the real environmental threat: hydrogen sulfide and chlorine compounds in the headworks air that corrode uncoated PCB traces within months of commissioning. Specifying 1UF0 means paying for the protection that matters (coating) and skipping the protection that is already handled upstream (filtering).