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Notes on the documentation

CX50x0 - Hardware Documentation 31

UL requirements

Danger

For the compliance of the UL requirements the CX-Controllers should only be supplied

 by a 24 V

supply voltage, supplied by an isolating source and protected by

means of a fuse (in accordance with UL248), rated maximum 4 Amp.

 by a 24 V

power source, that has to satisfy NEC class 2.

A NEC class 2 power supply shall not be connected in series or parallel with

another (class 2) power source!

This UL requirements are valid for all supply voltages of the CX-Controllers!

To meet the UL requirements, the CX-Controllers must not be connected to unlimited

power sources!

PE power contacts

Attention

Power contact "PE"

The ”PE" power contact must not be used for other potentials.

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Beckhoff CX50x0 Manual do Utilizador Página 33