S5-100U Installation Guidelines
Using Special Interference Suppression Measures
Protective Inductive Circuit
Inductors located in the same cabinet and not directly controlled by SIMATIC outputs (e.g., contactor
coils and relay coils) must be bridged by arc suppressing elements (e.g., RC elements).
Figure 3-26. RC Circuits for Coils
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With a diode
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With a zener diode
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With a varistor
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With an RC element
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Protective circuits for DC-controlled coils
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Protective circuits for AC-controlled coils
Partitioning Inductors
It is recommended that you use metal barriers to partition the portion of the cabinet that contains
large inductors, such as transformers or contactors.
Protection against Electrostatic Discharge
You should use metal enclosures or cabinets closed on all sides to protect devices and modules
against electrostatic discharges.
These enclosures or cabinets should have a good conductive
connection to the grounding point at the installation site.
If you install your control system in a terminal box, then use a cast-metal housing or sheet-metal
housing if possible.
A plastic housing should always have a metallic surface. Connect housing doors
or covers to the chassis ground via grounding strips or contact springs.
If you work on the system and have the cabinet open, adhere to the guidelines for working with
electrostatic sensitive devices (ESD).
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EWA 4NEB 812 6120-02
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