Festo VISB/SF50 Serie Notice Simplifiee page 14

VISB/SF 50
Wiring example – supply voltage connection
WARNING
Use only power units which guarantee reliable electrical iso-
latin of the operating voltage as per IEC 742/EN 60742/
VDE 0551 with at least 4 kV isolation resistance (Protected
extra low voltage, PELV). Switch power packs are permitted
providing they guarantee reliable isolation as per EN 60950/
VDE 0805.
PLEASE NOTE
Protection against electric shock (protection against direkt and
indirect contact) is guaranteed on Festo valve terminals by the
use of PELV power units in accordance with EN 60204-1/IEC
204. The valve terminals must be earthed in order to guarantee
the protective function (e.g. EMV).
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