Emerson FB1100 Anleitung Zur Sicheren Verwendung Seite 5

Safe Use Instructions – Emerson FB1100 Flow Computer
Part D301768X012
September 2018
Figure 6. FB1100 using Coplanar Mount
Figure 7. FB1100 on Pipe Mount
Grounding
Remove the front and rear covers of the FB1100 as
detailed in either Chapter 2 of the Emerson FB1100 Flow
Computer Instruction Manual (part D301752X012) or in
the Emerson FB1100 Flow Computer Quick Start Guide
(part D301785X012). Store the covers in a secure
location.
If your company has no specific grounding
requirements, install the FB1100 as a "floating"
(unconnected to ground) system using the ground lug
and routing the ground wire through one of the conduit
fittings. Otherwise, follow your company's specific
grounding practices. However, if you are making a
connection between a grounded device and an EIA-232
(RS-232) port, ground the FB1100's power supply
If you must ground the equipment, observe the
following guidelines:
When the equipment uses a DC voltage source,
▪
the grounding system must terminate at the
service disconnect. All equipment grounding
conductors–including wire or conduit carrying the
power supply conductors–must provide an
4
uninterrupted electrical path to the service
disconnect.
▪ Improper grounding or poor grounding practices
can often cause problems, such as introducing
ground loops into the system. Properly grounding
the FB1100 helps to reduce the effects of electrical
noise on the unit's operation and protects against
lightning. Install a surge protection device at the
service disconnect on DC voltage source systems
to protect the installed equipment against
lightning and power surges.
Ensure that the flow computer's ground is
▪
separate from the cathodic protection ground.
The grounding installation method for the FB1100
▪
depends on whether the pipeline has cathodic
protection. On pipelines with cathodic protection,
electrically isolate the FB1100 from the pipeline. All
earth grounds must have an earth-to-ground rod or
grid impedance of 25 ohms or less, as measured with
a ground system tester.
Wiring to Power
Review the power wiring descriptions in Chapter 2 of the
Emerson FB1100 Flow Computer Instruction Manual (part
D301752X012). Wire the FB1100 through the conduit
fittings on the side of the housing. The terminal blocks
accept 2mm in diameter/3mm
connect the wire to the removable block compression
terminals:
Bare the end (6mm maximum) of the wire.
▪
Insert the bared end of the wire into the clamp
▪
beneath the termination screw.
Tighten the screw.
▪
Expose a minimum of bare wire to prevent short circuits.
Allow some slack when making connections to prevent
strain.
Verify the hook-up polarity is correct.
To make DC power supply connections:
Optionally, install a surge protection device at the
▪
service disconnect.
Install a fuse at the input power source.
▪
Remove the terminal block connector from the
▪
socket.
▪ Insert each bare wire end into its appropriate
connector and secure the wire (see
Plug the terminal block connector back into the
▪
socket.
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or smaller wiring. To
Figure 8).