3 System Description
EDBC250SBC |1.1
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3.3.1 Earth
Connect the Safety modules to earth by attaching the metal housing to operative earth.
Since the operative earth connector dissipates HF currents, it is of utmost importance for the
module's noise immunity.
HF interference is dissipated from the electronics board to the metal housing. The metal
housing therefore needs to be suitably connected to an operative earth connector.
You will normally have to ensure that
• the connection between module housing and DIN rail conducts well,
• the connection between DIN rail and switching cabinet conducts well,
• the switching cabinet is safely connected to earth.
In special cases you may attach the earth wire straight to the module.
• Earth wires should be short and have a large surface (copper mesh).
Figure 3: Aluminium profile
operative earth
M3 x 5 bolt connection
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