Siemens Sinamics S120 Manual page 759

Danger to life due to high leakage currents caused by an interrupted external protective
conductor
The drive components conduct a high leakage current via the protective conductor.
Touching conductive parts when the protective conductor is interrupted can result in death
or serious injury.
• Ensure that the external protective conductor satisfies at least one of the following
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
● 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
Booksize Power Units
Manual, (GH2), 04/2014, 6SL3097-4AC00-0BP6
WARNING
conditions:
– It has been laid so that it is protected against mechanical damage.
– If it is a single conductor, it has a cross-section of at least 10 mm² Cu.
– If it is a conductor of a multi-conductor cable, it has a cross-section of at least
2.5 mm² Cu.
– It has a second protective conductor in parallel with the same cross-section.
– It complies with the local regulations for equipment with increased leakage current.
Cables laid within control cabinets or closed machine housings are considered to be
1)
adequately protected against mechanical damage.
1)
conduct the operating current.
never cover ventilation slots.
Cabinet design and EMC Booksize
12.9 Cable shielding and routing
1)
759