KEB COMBIVERT P6, Instruction Manual

Page: 16 / 48

2.4 EMC Instructions
COMBIVERT represent electrical equipment designed for use in industrial and commercial
units. The person installing / operating the machine / unit is obliged to prove the protective
measures demanded by the EMC directive. The prescribed ratings can usually be complied
with when using the radio interference voltage filters specified by KEB, and when observing
the following measures and installation guidelines.
2.5 EMC conform installation
The COMBIVERT is designed to be used in the second environment as defined in EN 61800-
3 (unit with its own supply transformer). Take additional measures when using it in the first
environment (residential and commercial area connected to public low-voltage mains)!
• Install the cabinet or system correctly.
• Ground the cabinet or the system earth star point with the shortest connection to mains
earth (avoid earth loops)
• To avoid coupled-in noise, separate supply lines, motor lines, control and data lines (low-
voltage level < 48V) and leave a space of at least 15 cm between them when installing.
• In order to maintain low-resistance high frequency connections, earthing and shielding, as
well as other metallic connections (e.g. mounting plate, installed units) must be in metal-
to-metal contact with the mounting plate, over as large an area as possible. Make ground
connections with a surface as large as possible (earthing strips).
• Only use shielded cable with copper or tin-plated braid, since steel braid is not suitable for
high frequency ranges. The screen must always be installed on the compensating rail and
fastened with clips or guided through the wall of the housing. Do not elongate the screen
end (pigtails) with individual conductors!
• If external interference suppression filters are used, then these must be installed as close
as possible to (<30cm from) the interference source and in metal-to-metal contact with the
mounting plate.
• Always equip inductive control elements (contactors, relays etc.) with suppressors such as
varistors, RC-elements or damping diodes.
• All connections must be kept as short as possible and as close as possible to the earth, as
free floating lines work as active and passive aerials.
• Keep connection cables straight (do not bundle). Install a non-assigned wire at one sides to
the protective earth conductor.
• The flow and return circuit must be twisted when the lines are not shielded, in order to
dampen common-mode noise.
• Further informations are found in the internet, see „www.keb.de“.
16
EMC Instructions