Siemens SIMATIC TI500 Spezifikationen PDF herunterladen (Seite 51)

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Pre-installation Guidelines SIMATIC 545/555/575 System Manual

2.7 Wiring Guidelines

Consider the following guidelines before installing any system or power

wiring:

• Always use the shortest possible single-length cable.

• Avoid placing system and field wiring in the vicinity of high-energy

and/or high-frequency wiring.

• Keep field input wiring, output wiring, and all other types of wiring in

the panel physically separated when possible.

• Separate DC field wiring from AC field wiring wherever possible.

• Avoid sharp bends to power and data cables. Use 3 in. (76 mm) radius,

minimum, on all bends.

• Ensure that a good low earth ground impedance of 0.1 ohm or less

exists for all components in the system.

• Use metal wireways and conduit when possible.

• Keep wire strippings from falling into modules, CPUs, or bases.

• Use separate wires for long return lines to the power supply—do not

use the same wire for input and output modules. Using separate return

wiring for these modules minimizes the voltage drop on the return lines

of the input connections.

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