Siemens S5-135U/155U User Manual
Page 33
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System Manual
C79000-G8576-C199-06
Employ special EMC measures for particular applications (see
Section 3.3.4).
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Fit quenching elements to all inductances which are not controlled by
SIMATIC S5 modules.
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Use 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).
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Use specific grounding measures. Grounding of the control system is a
protective and functional measure.
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System 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.
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In the case of potential differences between system parts and cabinets,
install equipotential bonding conductors of sufficient rating.
Installation Guidelines