Screening
Twisted screened cable should be used for connections
via the RS485 interface.
• Earth the screens of all cables that lead to the cabinet,
upon entering the cabinet.
• Connect the screens over a generous area
and in a manner that will conduct well, to a low-noise
earth.
• Gather the cables mechanically above the earthing
clamp in order to avoid damage due to cable
movements.
• Use suitable cable glands to feed the cables into
the cabinet - for example armoured conduit couplings.
Cable type
The cable used must be suitable for an environmental
temperature of at least 80°C.
Recommended cable types:
Unitronic Li2YCY(TP) 2x2x0.22 (from Lapp Kabel)
Unitronic BUS L2/FIP 1x2x0.64 (from Lapp Kabel)
Maximum cable length
1200m at a baud rate of 38.4k.
Fig. Screening procedure at cabinet entry.
Cable
Strain relief
Screen braid of the cable
Earthing clamp
Low-noise earth
C
For the wiring of the Modbus connection,
CAT cables are not suitable. Please use
the recommended cables.
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