Festo PROFIBUD-DP, Elektronics Manual

Page: 41 / 154

1. Installation CPV−DI02 and CPV−CS02
1−27
Festo P.BE−CPV−DI02−EN en 0704NH
1.5.2 Selecting the power unit
Warnin g
·
In order to provide the electric power supply, use only
PELV
circuits as per IEC/DIN EN 60204−1 (Protective
Extra−Low Voltage, PELV).
Take into account also the general requirements for
PELV circuits as per IEC/DIN EN 60204−1.
·
Use only po w er packs which guarantee reliable electrical
isolation of the operating voltage as per IEC/DIN
EN60204−1.
By the use of PELV power units, protection against electric
shock (protection against direct and indirect contact) is
guaranteed in accordance with IEC/DIN EN 60204−1
(electrical equipment of machines, general requirements).
The current requirement of a CP system depends on the
number of CP modules and valve coils.
Recommendation:
·
Use closed−loop controlled power units.
·
When selecting the power unit, check that it provides
sufficient output. If necessary, calculate the total current
requirement according to the following table.