Section 2 Installation Mounting AC 800M Units onto DIN-Rail
3BSE036351-510 A 65
Normally the use of an additional enclosure will not influence the EMC
characteristics of the controller.
Enclosure Mounting
When mounting the controller enclosure, it is important to provide certain minimum
distances between the enclosure, the walls and the ceiling, in order to provide
satisfactory ventilation.
If the enclosure is provided with removable wall cladding, it is important to ensure
that this is not removed from any enclosure adjacent to other enclosures containing
equipment not belonging to the AC 800M Controller and its connected S800 I/O.
ABB Cabinets
As a suitable enclosure, ABB recommends the following two cabinets, both
specially adapted for mounting the AC 800M Controller and S800 I/O. Both are
sealed to protection class IP54 and can support the Controller and S800 I/O units
with no requirement for additional cooling equipment:
• RM550 – Floor-mounted cabinet
• RE820 – Wall-mounted cabinet.
For further information on ABB cabinets, see Appendix C, Recommended
Components.
Mounting AC 800M Units onto DIN-Rail
Since the AC 800M units (CPU and communication interfaces) are cooled by self-
convection, it is important that they only be mounted onto a horizontal DIN- rail.
Each baseplate has a locking mechanism that contacts the metal backplate to the
DIN-rail, providing an effective ground connection. The DIN-rail functions as a
very effective ground for the system.
The additional screw lugs, located in the lower part of the baseplate, serve no
electrical function. They are provided for use should extra fastening be required
within environments subject to excessive vibration.
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