Connecting The Electric Cables - Festo CPA VI Series Manual

3. Installation

3.2.4 Connecting the electric cables

3-16
PLEASE NOTE
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 resist-
ance (protected extra low voltage, PELV). Switch
power packs are permitted if they guarantee reliable
isolation in accordance with EN 60950 / VDE 0805.
Remark:
Protection against electric shock (protection against di-
rect and indirect contact) is guaranteed on Festo valve
terminals by the use of PELV power units in accord-
ance with EN 60204-1 / IEC 204. The valve terminals
must be earthed in order to ensure their function (e.g.
EMC).
Earthing/grounding the CPA valve terminal with
CP or AS-i connection
PLEASE NOTE
Earth/ground your CPA valve terminal.
• Connect the earth cable of the left-hand end plate
to the earth potential with low impedance (short
cable with large diameter).
You will then avoid electromagnetic interference.
CPA... 9808A