6
Installation and Operation
EDBC250SIO | 2.0
47
6.2
Electrical Installation
6.2.1
Earth
Connect the c250-S modules to earth by attaching the metal housing to functional earth. Since
the functional 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 a functional earth connector. You would
normally ensure that the connection between the module housing and the DIN rail as well as
the connection between the DIN rail and the control cabinet conducts well and that the
control cabinet is properly connected to earth.
In exceptional cases, you may connect earth directly to the front of the module.
Information
Earth wires should be short and have a large surface (copper mesh). Refer to
http://de.wikipedia.org/wiki/ground_(electronics) for further details
Note
When installing production or other lines, measure the earth potential of the
DIN rail as specified in the applicable guidelines (earth test to VDE 0100) .
Measuring the earth potential must show that every protective earthing and
operational earthing is within the boundaries set by the applicable standards.
Also consider the repeat testing frequency resulting from the hazard
assessment.
I
I
Figure 6: Aluminium profile in the FIO module
Earth / cable shield
Connect DIN rail with
operative earth
M3x5 bolt
connection
Содержание c250-S
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