Grounding - ABB S800 I/O User Manual

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The following sections examine some of these factors in detail and provide
recommendations and requirements as necessary.
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S800 I/O equipment can be installed in a designated control room, or located in the
process area when housed in a suitable enclosure. The S800 I/O is designed for a
demanding industrial environment.
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The maximum ambient air temperature around S800 modules is 55°C (131°F) for
I/O modules mounted on Extended MTUs on vertical or horizontal orientated DIN-
rails. I/O modules mounted in Compact MTUs on a vertical DIN-rail allows opera-
tion at 40°C (104°F) and horizontal DIN-rail allows operation at 55°C (131°F).
The ambient temperature de rating which applies for vertical DIN-rail and Compact
MTUs is due to the reduced air flow through an I/O module due to the orientation.
The different hardware modules in the S800 I/O have different outputs of heat.
Accurate calculation of the heat produced by the system requires knowledge of the
modules and the work cycle. Power supplies with regulated outputs are highly
recommended to minimize heat in cabinets. Use of such devices will reduce the
power loss of resistive loads and current outputs, for example, digital inputs and
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Ease of access for moving equipment in and out of area.
Free space in front of cabinets. Also consider the need of space to fully open a
cabinet door either left hand or right hand hinged.
Spare area for future expansion of the system.
Grounding by an effective plane of copper bars.
Cable routing with respect to installation rules.
Availability of power and other utilities.
3BSE 020 923R101