Installing signal lines and signal cables
Line Routing
The following measures are recommend:
● Route signal and control lines separately from the power cables with a
minimum distance of d5 = 100 mm (see "Division into Areas (zones)" on
page 183) or with a grounded separating sheet. The optimum way is to
route them in separate cable ducts. If possible, lead signal lines into the
control cabinet at one point only.
● If signal lines are crossing power cables, route them in an angle of 90°in
order to avoid interference injection.
● Ground spare cables, that are not used and have been connected, at
least at both ends so that they do not have any antenna effect.
● Avoid unnecessary line lengths.
● Run cables as close as possible to grounded metal surfaces (reference
potential). The ideal solution are closed, grounded cable ducts or metal
pipes which, however, is only obligatory for high requirements (sensitive
instrument leads).
● Avoid suspended lines or lines routed along synthetic carries, because
they are functioning like reception antennas (noise immunity) and like
transmitting antennas (emission of interference). Exceptional cases are
flexible cable tracks over short distances of a maximum of 5 m.
Shielding
Connect the cable shield immediately at the devices in the shortest and most
direct possible way and over the largest possible surface area.
Connect the shield of analog signal lines at one end over a large surface
area, normally in the control cabinet at the analog device. Make sure the con‐
nection to ground/housing is short and over a large surface area.
Connect the shield of digital signal lines at both ends over a large surface
area and in short form. In the case of potential differences between beginning
and end of the line, run an additional bonding conductor in parallel. This pre‐
vents compensating current from flowing via the shield. The guide value for
the cross section is 10 mm
2
.
You absolutely have to equip separate connections with connectors with
grounded metal housing.
In the case of non-shielded lines belongs to the same circuit, twist feeder and
return cable.
DOK-RCON02-FV*********-IB08-EN-P Bosch Rexroth AG 189/259
Rexroth Frequency Converter Fv
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