Cabinet design and EMC
12.5 Cable shielding and routing
292
SINAMICS S120 Combi
Manual, (GH9), 07/2016, 6SL3097-4AV00-0BP5
The cable shields must be connected as close to the conductor terminal connections as
possible to ensure a low-impedance connection with cabinet ground. For power cables from
Siemens in which the shield is connected to the connector shell (see relevant catalog), this is
a sufficiently good shield support.
For components that do not have any special shield connection or where the shield
connection is not sufficient, the cable shields can be connected to the metal mounting plate
using hose clamps and toothed rails. The cable length between the shield contact point and
the terminals for cable cores must be kept as short as possible.
When routing 24 V cables, the following must also be observed:
● A maximum of 1 conductor pair may be bundled together.
● 24 V conductors must be routed separately from other cables and conductors that coul
d
c
arry the operating current.
● 24 V cables must never be routed parallel to power cables.
● 24 V cables as well as power cables should be routed to the components so that they
never cover ventilation slots.
Conditions of use for 24 V cables
● Ambient temperature 55 °C
● Conductor temperature limit ≤ 70° C for operation with the rated load current
1)
● C
able length max.:
– 10 m for the 24 V supply cables
– 30 m for signal cables without a supplementary RC circuit
1)
Conductor temperature limit 60 °C for UL applications
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