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6.2.
Earthing
The PAC340 must be earthed. For this purpose, the metal housing must be connected to a
functional earth.
The functional earth is used to dissipate HF currents and is of great importance to the immunity
of the module. HF interference is diverted from the electronic circuit board to the metal hous-
ing. The metal housing now requires a suitable connection to a functional earth.
You must ensure that
the module housing has a good conductive connection to the top-hat rail,
the top-hat rail has a good conductive connection to the control cabinet,
the control cabinet has a good earthing.
In special cases, the earth wire may be attached straight to the module.
Fig.: 4 Earthing
NOTICE
Earth wires should be short and have a large surface area (copper braiding).
You can find information, for example, at http://de.wikipedia.org/wiki/Masse_(Electron-
ics).
DIN mounting plate with
Connect functional earth
