16
17
INM MTL9373-FB3 Rev 1
INM MTL9373-FB3 Rev 1
5.6 Spur wiring connections
Refer to Figures 5.11 for additional details.
Figure 5.11
– Spur wiring options
The spur cables can be connected directly onto the fieldbus barrier carrier (see Figure
5.11) or through an FS32 Spur Surge module (also see Figure 5.11).
5.6.1 Connecting the spur cables
Prepare the spur cables in accordance with the gland manufacturer’s instructions and
secure the cables in the glands.
IMPORTANT
Cable ferrules must be fitted to any stranded cable or screen wiring that is
being used.
Connect the prepared ends of the fieldbus spur cables into the +, ‘S’ and – terminals
on the carrier (or surge module, if fitted), making sure that the same polarity is
observed for all spurs.
5.6.2 Fitting FS32 Spur Surge modules
Spur Surge modules are pluggable units (see Figure 5.11) that integrate easily with
the standard pluggable connector and which direct excessive spur surge currents to
the protective local ground.
To fit an FS32:
a) Unscrew the two captive screws securing the standard pluggable connector
(supplied on the carrier) and remove it from its socket.
b) Insert the FS32 module into the now vacant socket on the carrier; tighten
the two side securing screws and the central “protective ground” screw, to a
recommended torque of 0.5 - 0.6 Nm.
c) Fit the connector (removed at Step 1 above) into the socket on the FS32 and
tighten its two securing screws also to a recommended torque of
0.5 - 0.6 Nm.
Removal of a Spur Surge module is the reverse of the fitting process.
5.5.3 Trunk Termination
The Fieldbus Barrier has a built-in terminator facility that is used when the
module is the last, or only, barrier on the trunk.
The terminator is ‘activated’ by positioning the link on the right, as shown in
Figure 5.10 below.
Consult Section 3 for guidance on how to set the terminator link for single or
double enclosure installations.
Figure 5.10
– Trunk Terminator link connector
Before refitting the Trunk wiring protective cover:
• Check all wiring connections
• Confirm that the Grounding link is in accordance with the Option required
• Check that the Terminator link is in the correct position
Replace the transparent protective cover over the terminal block and ensure
that there is positive engagement of the retaining clip and replace the securing
screws.
A B C
T
N/C
T
T
