Festo MH1 Serie Manual De Instrucciones página 18

3 Electrical connection of miniature valves
Warning
S Use only power units which guarantee reliable isola-
tion of the operating voltages as per IEC 742/
EN 60742/VDE 0551 with at least 4 kV isolation resis-
tance (Protected Extra Low Voltage, PELV, see adjac-
ent symbol). Switch power packs are permitted, pro-
viding they guarantee reliable isolation in accordance
with EN 60950/VDE 0805.
By the use of PELV power units, protection against electric
shock (protection against direct and indirect contact) is
guaranteed in accordance with EN 60204-1/IEC 204.
Safety transformers with the adjacent symbol must be
used for supplying PELV networks.
3.1 Multipin connection
For controlling the valves, each valve coil is assigned to a
certain pin of the multipin plug. A valve location therefore
always occupies one address. Unused valve locations, e.g.
reserve plates, also occupy one address.
Warning
Fast-switching valves of size MH2 contain electrostati-
cally sensitive components. The components will be
damaged if you touch the contact surfaces of the plug
connectors and if you do not observe the regulations
for handling electrostatically sensitive components.
18 Festo MH.-... 0108NH English