290 Planning for installation
Selecting control cables
All control cables must be shielded. Use double-shielded twisted pair cable for low
voltage digital signals (control cables to on-field devices). An alternative solution is to
use single-shielded twisted multi-pair cable.
See section Control connection data on page 516 and chapter Planning the electrical
installation in the drive hardware manual.
Routing the cables
See chapter Planning the electrical installation in the drive hardware manual. Obey
especially these rules:
• When using redundant signaling, take care to avoid common cause failures in the
cables. This can be done by routing the two channels through two well-apart
routes, or by protecting the cabling appropriately, for example by using double-
shielded cables.
• Never mix 24V-level signals with non-ELV-signals or power feeds in the same
cable.
• Safety Related Electronic Control System (SRECS) signal cables for the
individual channels must be routed separately from the other channels at all
positions or sufficiently shielded.
• SRECS signal and electrical energy power cables must be separated at all
positions or sufficiently shielded.
• Cross-connection between the channels of the subsystem must be prevented.
• Signal paths must be physically separated (for example, separation in wiring).
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