NBIO-21C ABB Programmable Logic Controller for Distributed Control System

Description

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Depending on the drive, the module(s) can be installed either inside or
outside the drive housing or cabinet. See the Hardware Manual of the
drive for module placement options.
Mounting Outside
the Drive
Choose the location for the module. Note the following:
• The cabling instructions (given later in this chapter for each module
type) must be followed. Also, the length of the fibre optic cables
included in the option package may restrict the distance between
the module and the drive.
• Observe the free space requirements for the module (min. 10 mm
from adjoining equipment or wall) and the drive (see the drive
documentation).
• The ambient conditions must be taken into account (see
Appendix B). The degree of protection of the module is IP 20.
• Module earth is connected to the mounting rail by means of an
earthing clip (see Figure 3-2 below). The mounting rail onto which
the module is to be mounted must be earthed to a noiseless earth. If
the rail is not mounted on a properly earthed base, a separate
earthing conductor must be used. The conductor must be as short
as possible and the cross-sectional area must be 6 mm2 at least.
Note: No solid copper conductor may be used (stranded wire
allowed only).
Mounting instructions:
1. Switch off all dangerous voltages in the enclosure that the module
is to be mounted in.
2. Fasten the rail and ensure proper earthing as described above.
3. Push the module onto the rail. The module can be released by
pulling the locking spring with a screwdriver (see Figure 3-2).