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FBM-Serie
Bus routing between FBM modules and UMGs
Shields
A twisted, shielded cable is foreseen for connections 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 ca-
binet.
Cable type
The cables used must be suitable for an
environmental 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.
24
Fig. Shielding arrangement at cabinet entry point.
Cable
Strain relief
Cable shielding braid
Grounding clip
Low external voltage
ground
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