Beckhoff EL1918 - Maintenance and cleaning; Cleaning by the manufacturer only

Maintenance and cleaning
EL1918 and EL1918-220056 Version: 2.0.0
6 Maintenance and cleaning
Cleaning by the manufacturer only
Do not operate the TwinSAFE component if it is impermissibly dirty according to protection class
IP20. Send impermissibly dirty TwinSAFE components to the manufacturer for cleaning.
TwinSAFE components are basically maintenance-free.