Festo CPX Series Electronic Manual page 81

3. Installation
Festo P.BE-CPX-SYS-EN en 0112NH
Potential equalization
The CPX terminal has two earthing connections for potential
equalization:
– Pin 4 of the power supply connection of the system
supply (incoming).
– Pin 4 of the load voltage connection of the additional
supply (incoming).
– Earth connection on the left-hand end plate (see Fig. 3/4).
Please note
Always connect the earth potential to pin 4 of the load
•
and operating voltage connections.
Connect the earth connection of the left-hand end plate
•
with low impedance (short cable with large cross-sec-
tional area) to the earth potential.
With low-impedance connections you can ensure that
•
the earth connection at the left-hand end plate and the
earth connection at pin 4 have the same potential and
that there are no equalizing currents.
In this way you can avoid faults due to electromagnetic
influences and ensure electromagnetic compatibility in
accordance with EMC guidelines.
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