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holding in position mark the locations of the rack
mounting holes. Carefully remove the expansion
rack and then drill and tap mounting holes in the
plate with an 8-32 UNC thread tap. Plug the
expansion rack into the main unit and attach to the
plate with the 8-32 UNC x 1.00 inch-long screws
provided. Torque the eight mounting screws to
approximately 1.1 to 1.4 N-m.
Note: If metric screws are substituted, use truss-
head style screws to keep from fracturing
the plastic housing during tightening.
Figure 4. FB107 and Expansion Rack Dimensions
Main unit with expansion rack mounted on adaptor
▪
panel. Position as desired on the enclosure
mounting plate and locate mounting holes on the
plate using the FB107 assembly as a template. See
Figure 5
for adaptor panel dimensions. Drill and tap
mounting holes in the plate with an 8-32 UNC
thread tap. Position the FB107 assembly over the
tapped locations and attach to the plate with the
four 8-32 UNC x 1.00 inch-long screws provided.
Torque the four mounting screws to approximately
1.1 to 1.4 N-m.
Note: If metric screws are substituted, use truss-
head style screws to keep from fracturing
the plastic housing during tightening.
127.0
[
5.00
Figure 5. Panel Dimensions
www.Emerson.com/RemoteAutomation
317.5
[
]
12.50
127.0
]
[
]
5.00
31.8
[
]
1.25
282.5
[
]
11.12
Safe Use Instructions – Emerson FloBoss 107
3. Perform an electrical strength test on the FB107 in
enclosure assembly. Conduct the test by short-
circuiting the AUX PWR IN, DVS, and DISPLAY
connections and the adaptor panel or a local plant
earth. Use one of the following voltages:
▪ 500 V r.m.s (+5%, –0%) for 60 seconds
▪ 700 V d.c. (+5%, –0%) for 60 seconds
Do not exceed a maximum flowing current of 5 mA;
ensure there is no breakdown or flashover.
4. Find a suitable location for the enclosure assembly.
When choosing an installation site, be sure to check
all clearances. Provide adequate clearance for wiring
and service. Seal any holes placed in the enclosure to
maintain the IP54 enclosure rating. Ensure the
mounting of the assembly meets all weight
requirements and the installation conforms to local
building codes.
5. Properly ground the FB107.
Properly grounding the FB107 helps to reduce the
effects of electrical noise on the unit's operation and
protects against lightning. The FB107 provides
lightning protection for built-in field wiring inputs and
outputs.
All earth grounds must have an earth-to-ground rod or
grid impedance of 2.0 ohms or less, as measured with a
ground system tester. The grounding conductor should
have a resistance of 1 ohm or less between the FB107
enclosure ground and the earth ground rod or grid.
If the pipeline-to-earth impedance is greater than 2
ohms, electrically isolate the FB107 and install a
ground rod or grid grounding system.
The recommended cable for I/O signal wiring is an
insulated, shielded, twisted-pair. The twisted pair and
the shielding minimize signal errors caused by EMI
(electromagnetic interference), RFI (radio frequency
interference), and transients.
6. Connect the FB107 to power, I/O devices, and
communication devices. The external connections (or
field terminals) are all located on the termination
board. The terminal block accepts wires up to 16 AWG
in size.
The FB107 connectors use compression terminals.
The input power termination (IN+ / IN–) uses a
removable connector and accommodates wiring up
to 16 AWG in size. In all cases, make connections by
baring the end (6 mm maximum) of the wire,
inserting the bared end into the clamp beneath the
termination screw, and then tightening the screw to
0.25 N-m.
The inserted wires should have a minimum of bare
wire exposed to prevent short circuits. Allow some
slack when making connections to prevent strain.
Part D301594X012
February 2018
3
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