32
UMG 511
Shields
A twisted, shielded cable is foreseen for con-
nections using the RS485 interface.
• Ground the shields of all cables leading to
the cabinet at the cabinet entry point.
• Connect the shield extensively and with
good conductivity with a low external
voltage ground.
• Intercept the cable mechanically above
the ground clip in order to avoid damages
caused by cable movements.
• Use suitable cable insert guides, such
as PG glands, to guide the cable into the
switch cabinet.
Cable type
The cables used must be suitable for an envi-
ronmental temperature of at least 80°C.
Recommended cable types:
Unitronic Li2YCY(TP) 2x2x0.22 (Lapp cable)
Unitronic BUS L2/FIP 1x2x0.64 (Lapp cable)
Maximum cable length
1200m at a Baud rate of 38.4k.
Fig. Shielding arrangement at cabinet entry point.
Terminal resistors
The cable is terminated with resistors (120Ohm
1/4W) at the beginning and end of a segment.
The UMG511 does not have any terminal resis-
tors.
Cable
Strain relief
Cable shielding braid
Grounding clip
Low external voltage
ground
C
For the wiring of the Modbus con-
nection, CAT cables are not suit-
able. Please use the recommended
cables.
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