Emerson FB2100 Anleitung Seite 6

Safe Use Instructions – Emerson FB2100 Flow Computer
Part D301770X012
September 2018
2. The FB2100 mounts on a two-inch pipe or pole. See
Figure 7.
Figure 7. FB2100 (Aluminum Enclosure) on Pipe Mount
Grounding
Open the front door of the FB2100 as detailed in either
Chapter 2 of the Emerson FB2100 Flow Computer
Instruction Manual (part D301783X012) or in the
Emerson FB2100 Flow Computer Quick Start Guide (part
D301787X012).
If your company has no specific grounding
requirements, install the FB2100 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 FB2100'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
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 FB2100 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.
4
The grounding installation method for the FB2100
▪
depends on whether the pipeline has cathodic
protection. On pipelines with cathodic protection,
electrically isolate the FB2100 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
Wire the FB2100 through the conduit fittings on the
bottom of the housing. The terminal blocks accept 2mm
2
in diameter/3mm or smaller wiring. To 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.
Connect the power wiring. Review the power wiring
descriptions in Chapter 2 of the Emerson FB2100 Flow
Computer Instruction Manual (part D301783X012).
Verify the hook-up polarity is correct.
To make DC power supply connections:
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.
Figure 8. Wiring to DC Power Supply
Refer to the Emerson FB2100 Flow Computer Quick Start
Guide (part D301787X012) for detailed instructions on
connecting the battery.
www.Emerson.com/RemoteAutomation
Figure 8).