General Wiring Guidelines; Front Or Rear End Caps; Removing/Replacing Retaining Clamp On End Caps - Emerson FB1100 Instruction Manual

Emerson FB1100 Flow Computer Instruction Manual
D301752X012
July 2017
2.5

General Wiring Guidelines

The flow computer's pluggable terminal blocks use compression-type terminals that
accommodate wire between 28 and 12 AWG.
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2.6

Front or Rear End Caps

The flow computer includes two threaded covers (end caps). The front end cap includes a window
for viewing the HMI module; the rear end cap provides access to the terminal plate for power and
I/O wiring.
2.6.1

Removing/Replacing Retaining Clamp on End Caps

For flameproof ATEX/IEC applications, each end cap includes a retaining clamp which screws down
to prevent the end cap from being unscrewed.
Figure 2-2: Front End Cap with Retaining Clamp Fitted
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14
When making a connection, insert the bare end of the wire (approx. 1/4" max) into the
clamp adjacent to the screw and secure the screw.
To prevent shorts, ensure that no bare wire is exposed. If using stranded wire, tin the bare
end with solder to prevent flattening and improve connectivity.
Allow some slack in the wire while making terminal connections. Slack makes the wires
more manageable and helps minimize mechanical strain on the terminal blocks.
Use twisted pair, shielded and insulated cable for communication and I/O wiring to
minimize signal errors caused by electromagnetic interference (EMI), radio frequency
interference (RFI), and transients. When using shielded cable, ground all shields at only
one point in the appropriate system. This prevents circulating ground current loops that
can cause signal errors.
End Cap
Screw
Retaining Clamp
Installation