User Manual

3. Installation
3−27
Festo P.BE−SPC200−EN en 0901d
3.5.1 Selecting the power unit
Warning
· In order to provide the electric 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 I EC/DIN EN 60204−1.
· Use only power packswhich guarantee reliable electrical
isolation of the operating voltage as per IEC/DIN
EN60204−1.
By the use of PELV power units, protection against electric
shock (protection against direct and indirect contact) is guar
anteed in accordance with IEC/DIN EN 60204−1 (electrical
equipment of machines, general requirements).
Recommendation:
· Use a closed−loop controlled power unit.
· Select a power unit which will provide sufficient output
for later extensions.
· The current requirement depends on the number and
type of the connected components. When selecting the
power unit, check that it provides sufficient output. If
necessary, calculate the total current requirement accord
ing to the following table.