Festo VDMA−02−ZR.. 0403a English
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2.3 Fitting the electrical components
Warning
When using valves with DC 12 V or DC 24 V control
voltage:
S
Use only power units which guarantee reliable
isolation of the operating voltages as per IEC 742/
EN60742/VDE 0551 with at least 4 kV isolation
resistance (Protected Extra Low Voltage, PELV, see
adjacent symbol). Switch power packs are permitted,
providing 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 symbol shown above must be
used for supplying PELV networks. The valve terminal must
be earthed to ensure that it functions correctly (e.g. EMC).
