3.3.2 Type 05: Connecting the operating voltages
PLEASE NOTE
Use only power units which guarantee reliable
isolation of the operating voltages as per IEC
742/EN 60742/VDE 0551 with at least 4 kV
isolation resistance (protected extra low volt-
age, PELV). Switch power packs are permitted
if they guarantee reliable isolation in accord-
ance with EN 60950/VDE 0805.
Remark:
By using PELV power units, protection against
electric shock (protection against direct and
indirect contact) in accordance with EN 60204-
1/IEC 204 is guaranteed on Festo valve termi-
nals.
Safety transformers with the adjacent designa-
tion must be used for supplying PELV networks.
The valve terminals must be earthed in order to
ensure their function (e.g. EMC).
CAUTION
The power supply to the outputs/valves (pin 2)
must be separately fused externally with max.
10 A. The external fuse prevents the valve ter-
minal from being destroyed in the event of a
short circuit.
VIFB6 - 03/05 3. Installation
3-28
9809c
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