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5
Important installation instructions
Please note
The power packs used for the 24 V DC main power sup-
ply (Power connections) and power supply to the digital
inputs (nominally 24 V DC) must guarantee reliable
isolation of the operating voltage in accordance with
IEC 742 / EN 60742 / VDE 0551, PELV and offer an in-
sulation resistance of at least 4 kV.
Switched-mode power supplies that offer reliable isola-
tion as defined in EN 60950 / VDE 0805 are also per-
mitted.
The PS1 PSE3 power pack fulfils all the above require-
ments.
The power relays used allow mains voltages from overvol-
tage category II to be switched directly, and the insulation
resistance between contacts and coil is 3000 V AC.
26
Festo KBS_FEC FC20- 0206NH English
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