Installation Guidelines

Employ special EMC measures for particular applications (see Section 3.3.4).

SFit quenching elements to all inductances which are not controlled by SIMATIC S5 modules.

SUse incandescent bulbs for illuminating cabinets, and avoid fluorescent lamps.

Create a standard reference potential; ground all electrical apparatus if possible (see Sections 3.4 and 3.5).

SUse specific grounding measures. Grounding of the control system is a protective and functional measure.

SSystem parts and cabinets with central controllers and expansion units should be connected to the ground/protective conductor system in star configuration. This serves to avoid the creation of ground loops.

SIn the case of potential differences between system parts and cabinets, install equipotential bonding conductors of sufficient rating.

System Manual

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Siemens S5-135U/155U appendix Installation Guidelines