ABB AC 800M

Section 2 Installation Mounting AC 800M Units onto DIN-Rail
3BSE 027 941 R301 49
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.
The DIN-rail must be firmly attached to a suitable conductive mounting surface, by
means of suitable screws positioned at exact intervals of 100 mm (4 in) along the
full length of the rail.
The AC 800M Controller and associated units must be electrically isolated before
being mounted onto a DIN-rail!