8
INM9491 Rev 3
3.5 Assembly
3.5.1 Fitting earth rails
a) In upper position
Before fitting insulating mounting blocks IMB57, check that the swing nuts in the base of each
unit are turned back into the moulding. Locate the mounting blocks on the DIN rail in the chosen
position and tighten the screws (see figure 3.11). Check that the swing nuts rotate correctly to locate
underneath the flanges of the DIN rail.
Slide a straight earth-rail bracket ERB57S into the upper slot in each mounting block. Push two
plastic push fasteners into each bracket to locate the brackets in the mounting blocks.
Cut earth rail ERL7 to the length needed. Slide the required number of ETM7 earth terminals (5mm
or 7mm wide) onto the rail. Clamp each end of the earth rail to earth-rail brackets ERB57S using
the terminal clamps (14mm, 35mm
2
) supplied. Fit an earth clamp (10mm, 16mm
2
) to the free end
of each earth-rail bracket.
Note: For lengths of earth-rail greater than 500mm, provide additional support by installing a third
IMB57 mounting block and earth-rail bracket, mid-way between the end mounting blocks. Snap
out the perforated extension between the lugs on this mounting block if a continuous tagging strip
is to be fitted (see figure 3.4).
b) In lower position, where at least 150mm clearance exists on one side, measured from the
edge of the mounting block.
As for a), but slide earth-rail brackets ERB57S into the lower slots in each mounting block.
c) In lower position, where there is insufficient clearance to fit earth-rail brackets ERB57S.
As for a), but slide offset earth-rail brackets ERB57O into the upper slot in each mounting block
before assembling the mounting blocks to the DIN rail. ERB57S brackets cannot be used because
they obscure the mounting blocks' fixing screws.
3.5.2 Fitting tagging strips
Assemble mounting blocks IMB57 to the DIN rail as above. Cut TAG57 tagging strip and label to the
length needed, and insert label so that the appropriate side is visible. Clip the strip onto the lugs on the
mounting blocks. Hinge up the strip to provide access to the tops of the power supplies.
Note: If necessary, provide additional support for long lengths of tagging strip by installing an extra
IMB57 mounting block mid-way between the end mounting blocks. Snap out the perforated extension
between the lugs on this mounting block.
Figure 3.11:
Fitting IMB57
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