DRAFT - 11 December 2014
DRAFT - 11 December 2014
INM MTL4850_54 Rev4
17
DRAFT - 11 December 2014
Fit backplane
Refer to figure 4.13.
a) Select a mounting screw (A).
b) Place a locking washer (B) and a plain washer (C) over it.
c) Insert the screw through a fixing hole on the baseplate.
d) Fit a spacer (D) and retain it with washer (E).
e) Repeat steps a) to e) for the other five (5) mounting holes.
f) Fit the mounting feet (F) onto the DIN-rail in roughly the correct positions.
g) Offer up the baseplate to the mounting feet on the DIN rail, locate the screws into the
middle holes in the feet and secure each in turn. Return to tighten each screw before finishing.
4.8 Backplanes – identification and tagging
A rectangular area for identification is provided on each backplane. In addition, tagging strips are
available (TSK18) for mounting over the backplane safe-area connections. Two areas - marked ‘B’ in
Figures 4.10 and 4.11 - are provided with threaded inserts for attaching the tagging strip mounting posts.
a) Mount the tagging strip to the backplanes as follows:-
b) Attach each tagging strip mounting post (1) with two M3 x 12 mounting screws (2) and washers (3).
c) Attach colour coding labels (6) onto tag label (5).
d) Mark tag label (5) with tag references.
e) Slide tag label (5) into tag strip holder (4) and retain with plastic retaining rivet (7).
f) Attach plastic retaining tie (8) with two plastic rivets (7).
g) Clip tag strip holder (4) onto mounting posts (1) by pushing downwards.
4.9 Backplane earth rails
Optional earth rail kits are available (ERK18) - see Figure 4.15. Cable screens from hazardous-area
circuits or spare pairs from a multicore cable can be connected to the terminals on the earth rails.
These are mounted on the backplane at the same height as the tops of the module, close to the
hazardous-area connectors. Earth rails are attached using the following procedure:-
a) Locate the earth rail mounting positions - marked ‘C’ in Figure 4.15 - at each end of the
backplane.
b) Attach each mounting post (1) with two M3 x 12 mounting screws and washers (2).
c) Fit the earth terminals (3) onto the rail (4).
d) Insert the ends of the earth rail into the slots at the tops of the mounting posts.
e) Finally, insert the plastic retaining rivets (5) into each end of the rail.
Figure 4.14
Tagging strip
details
(TSK18)
Figure 4.15
Earth rail
details
(ERK18)
