Siemens SINAMICS S120 Manual page 735

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Shield connection

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 conductors must be kept as short as possible.

Shield contact plates with pre-prepared clip contacts are available for contacting the shields

for power cables of Line Modules and Motor Modules. Up to a module width of 100 mm

(inclusive), these plates are part of the scope of delivery of the components, or they are

integrated in the connector.

Routing 24 V cables

When routing 24 V cables, the following must also be observed:

● A maximum of one conductor pair may be bundled together.

● 24 V conductors must be routed separately from other cables and conductors that could

conduct 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 limit temperature: ≤ 70° C for operation with the rated load current

● Max. cable length: 30 m for 24 V power supply cables and for signal cables without

additional circuitry

Surge voltage protection devices must be used for longer cable lengths.

Booksize Power Units

Manual, (GH2), 07/2016, 6SL3097-4AC00-0BP8

Cabinet design and EMC Booksize

12.8 Cable shielding and routing

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