Siemens SINAMICS S120 Equipment Manual page 298

Cabinet design and EMC for components, Blocksize format
9.5 Information about Electromagnetic Compatibility (EMC) and Cable Routing
Avoid, where possible, routing unshielded cables, connected to the drive line-up, in the
immediate vicinity of noise sources, e.g. transformers. Signal lines (shielded and unshielded)
connected to the drive line-up, must be routed as far as possible away from strong external
magnetic fields (e.g. transformers, line reactors). In both cases, a distance of ≥ 300 mm is
usually sufficient.
Signal and DC power supply cables
Operating unshielded signal and direct current supply cables (e.g. 24 V infeed with external
supply):
• Direct current supply cables: Max. permissible length: 10 m
• Unshielded signal cables: Max. permissible length: 30 m (without additional wiring)
For greater lengths, suitable wiring must be connected by the user to provide overvoltage
protection. For example:
Table 9-5
DC supply
Weidmüller
Type no.: PU DS 24V 16A
Weidmüller GmbH & Co. KG
An der Talle 89
33102 Paderborn
Tel. 05252/960-0
Fax 05252/960-116
www.weidmueller.com
Caution
The connected signal and power cables must not cover the ventilation slots.
Caution
Unshielded signal cables must not be routed parallel to power cables.
9-14
Recommendations for overvoltage protection
24 V signal cables
Weidmüller
Type no.: MCZ OVP TAZ
Manual, (GH6), 03/2006 Edition, 6SL3097-2AL00-0BP0
Equipment Manual AC Drive