Siemens SINAMICS S120 Equipment Manual page 222

Cabinet Design and EMC
12.5 Electromagnetic Compatibility
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 12-10 Recommendations for overvoltage protection
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
http://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.
12-22
24 V signal cables
Weidmüller
Type no.: MCZ OVP TAZ
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2