Signal Cables And 24 V Supply Cables - Siemens SINAMICS S120 Combi Equipment Manual

Cabinet design and EMC
12.7 Cable shielding and routing
Avoid, where possible, routing non-shielded cables in the immediate vicinity of noise
sources, e.g. transformers. Signal cables (shielded and unshielded) must be routed far away
from strong external magnetic fields (e.g. transformers, line reactors). In both cases, a
distance of ≥ 300 mm is usually sufficient.
The drive components generate high leakage currents in the protective conductor. The
components must only be operated in control cabinets or in closed electrical operating
areas and must be connected with the protective conductor. To protect against electric
shock, the protective conductor connection at the control cabinet or machine must be
implemented in accordance with one of the following measures:
• Stationary connection and protective conductor connection by means of ≥ 10 mm
• stationary connection and installation of a second protective conductor with the same
12.7.2

Signal cables and 24 V supply cables

If you are using unshielded signal cables and 24 V supply cables (e.g. 24 V infeed from an
external supply), the following unshielded cable lengths are permissible:
● 24 V supply cables: max. length 10 m
● Signal cables: max. length 30 m without any additional protective circuitry
NOTICE
The connected signal and power cables must be routed to the components in such a way
that they do not cover the ventilation slots.
CAUTION
Unshielded signal cables must not be routed parallel to power cables.
256
DANGER
≥ 16 mm Al
2
cross-section as the first protective conductor
SINAMICS S120 Combi
Manual, Edition 05.2010, 6SL3097-4AV00-0BP0
Cu or
2