Dwyer MTL7787 - Manual (Page 10)

6 INM7700-6 Jan 2010
High - profile
DIN rail
OR
Low - profile
DIN rail
2 off M4 x 16
M6 X 16
50mm
62mm
14.6mm
20mm
Figure 9: Mounting ISP7000 insulating spacers
ETL7000
earth terminal
Clamping
screw
Earth terminal
screws
Figure 10: Mounting an ETL7000 DIN-rail earth terminal
TH7700
LABEL
Figure 11: Installing a TH7700 barrier tag holder
4.3.4 Earth rail assembly (ERL7/ETM7/ERB57S/O)
A screw terminals on each barrier is available for terminating cable
screens and 0V returns. An alternative is provided by an earth rail
assembly (figure 12). This consists of two IMB57’s, ERB57S or O,
mounting blocks (one for each end of a column of barriers), a length
of ERL7 earth rail (supplied in 1m lengths for cutting to size), and
ETM7 terminals for connecting cable screens or 0V returns to the rail.
Install the earth rail assembly as follows:
a) Hook the loose end-clamps of the IMB57 mounting blocks over
the flanges of the DIN-rail at each end of the row of barriers.
b) Making sure the blocks are flush with the end barriers or tagging
strip supports, clamp them firmly into place by tightening the
screws at the base of the blocks and fit 2 off ERB57O or S into
supports.
c) Slide the number of ETM7 terminals required for connections
onto the length of ERL7 rail needed for the assembly.
d) Important: wire up the earth rail assembly as given in section
5.3.3.
4.3.5 Barrier identifiers (TH7700)
TH7700 tag holders (figure 11) are clipped onto the tops ofindividual
barriers to provide transparent holders for identification labels
a) Slide the required label in between the top and lower parts of
the TH7700
b) Push the tag holder downwards until it clips into place.
c) To unclip a tag holder, lever up the far end above terminals.
4.3.6 Tagging strip assemblies(IMB57)
The tagging strip assembly (figure 12) identifies the location of
individual barriers, ensuring that they are replaced correctly after
removal for maintenance or testing. Once installed, the tagging strip
pivots upwards to provide access to, and allow removal of, individual
barriers.
Each assembly uses two tagging strip supports (IMB57), a tagging
strip (TAG57) and tag labels (TGL7700).
The assembly installation procedure is:
a)IMB57 tagging strip support. Making sure that the vertical
slots are on the hazardous-area side, hook the loose end-clamps
of each IMB57 tagging strip support over the flanges of the DIN-
rail at each end of the group of barriers.
b) Make sure that the tagging strip support is flush with the end
barrier in the row.
IMB57 tagging strip support. Clamp firmly in place by
tightening the two screws located at the foot of each support.
c) Remove any clic rivets from the tagging strip and slide out the
label.
d) Measure the distance between the top inside faces of the two
tagging strip supports.
e) Cut the tagging strip and label to this length with a hacksaw.
f) Annotate the tagging strip label as required and slide it back
into the tagging strip. Divisions on label strips are 12.6mm
wide, the pitch of individual barriers.
g) Clip the tagging strip onto the lugs on top of the tagging strip
supports.
4.3.7 Power bus (BPL7700)
For details on using and installing a power bus, see section 5.2.3.
Note: Early versions of TH7700 are hinged on two small locating
pins. Later versions are hinged by locating the clips at the hinged end
into the rectangular appartures on the barrier body. The later design
can be retrofitted on early modules by removing the hinge pins with
a knife.
TGL7700
ERB57O
TAG57
ERL7
ETM7
14mm earth-rail
clamp
THR2/THR7000
ERB57S
in lower position
ISP7000
ETL7000
10mm earth
clamp
IMB57
Snap off extension
when using IMB57
as a central support
Figure 12: Mounting earthing and tagging accessories