INM 937x-FB2-Px-SS Rev 1
11
4 .3 .2 Trunk wiring
Connect the trunk cable(s) in the following way.
• Remove the cover that protects the Trunk Terminal Area by applying
gentle pressure to the textured finger grips on each side of it: this releases the
catches from the recesses in the carrier housing, so that the cover may be lifted
away to reveal the trunk terminals. The cover is secured to the housing by a nylon
tie to avoid its loss or damage to it.
• Prepare the trunk cable(s) in accordance with the gland manufacturer’s
instructions and secure the cable(s) in the gland(s). Ensure that the cables are
not strained.
• Connect the prepared ends of the fieldbus trunk cable(s) into the appropriate
‘+’ , ‘–‘ and ‘S’ terminals, shown in Figures 4.4 or 4.5. The spring clamp (-PC
option) terminals are operated by inserting a narrow-blade screwdriver into
the upper opening, and lifting it to open the spring clamp in the terminal entry.
Insert the cable ferrule while the clamp is open, and release. Check that the
ferrule is securely held by applying gentle pressure to withdraw it.
Note:
Figure 4.3 shows the PC options.
• Check Section 4. 2 to confirm that the chosen fieldbus ground option is
correctly selected, and adjust if necessary.
4 .4 Trunk Terminator F93-XE
If the trunk is being looped onward to another enclosure then no fieldbus terminator
is required, but if the enclosure is the last (or only) enclosure on the trunk segment,
the trunk must be terminated correctly to ensure that the optimum signal quality
is maintained. The Trunk Termination Area has provision for a fieldbus terminator to
be fitted when required. Terminator model F93-XE is used with these enclosures to
provide the correct termination on the trunk segment.
Figure 4.3 shows the location of the terminator connection terminals and Figure 4.6
shows the fitting of the module. To fit the terminator, loosen the securing screws
in the two allocated terminals and insert the terminator, with the terminator body
facing towards the top of the assembly. Tighten the securing screws. Note that the
terminals for the terminator are always screw-terminal type, regardless of whether
the Fieldbus Barrier is a –PS (screw terminal) or –PC (spring clamp) version.
Figure 4 .6
– Fitting an F93-XE terminator module
Check all connections then replace the Trunk Terminal cover by locating the clips into
the carrier housing slots then pushing it gently until the clips fully engage.
WARNING !
The F93-XE Terminator must not be removed or replaced while the
Fieldbus Barrier segment is under power, unless the area is known to be
non-hazardous
Trunk
terminals
Terminator
terminals
Terminator
