Festo SEC-ST-48-6-P01, Fitting And Installation Instructions

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3. Installation
3-11
Festo SEC-ST-48-6-P01-EN en 0111NH
3.4 PE protective conductor and screening connections
3.4.1 Connection instructions
The screening of the motor cable is connected to the central
PE connection point of the SEC-ST.
The mains PE connector is also connected at this star point.
With greater lengths, special EMC protective measures must
be observed.
Warning
All PE cables must be connected before commissioning for
reasons of safety.
The mains PE connection is connected to the central PE
connection point of the SEC-ST.
Make sure that the earth connections between devices and
the mounting plate are of sufficiently large dimensions in
order to be able to discharge HF interference.
3.4.2 Electrical isolation
In the design of the SEC-ST, great importance has been
placed on high resistance to interference. For this reason indi-
vidual function blocks are electrically isolated from each
other. Signal transmission within the SEC-ST is carried out by
an opto coupler.