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accurate characterisation
of fieldbus wiring
FBT-5
The Fieldbus Wiring Validator, FBT-5
,
is used
in combination with the Relcom Fieldbus Monitor, FBT-6,
to test new or existing field wiring to determine its
suitability for use in a F
OUNDATION
fieldbus™ network.
The FBT-5 acts as a signal generator, supplying DC
power and a simulated fieldbus signal to the wire
pair being tested. The FBT-6 is then used to take
power, signal, and noise measurements. Testing can
be performed on existing instrumentation wiring,
multi-pair cables, newly installed fieldbus cable, or
a complete fieldbus wiring system with wiring blocks
and terminators already installed.
Connection
Using the clip leads, connect the FBT-5 to one
end of the cable. To the other end, attach the Test
Terminator. Connect the FBT-6 to the Test Terminator.
Be sure to attach the red clips to the positive fieldbus
wires and the black clips to the negative. If the wires
are reversed, the Monitor will not function.
Caution
The FBT-5 must not be used in a hazardous
area without a gas clearance certificate.
If connected to an IS trunk, even in a safe
area, the gas clearance must cover the
whole system.
Operation
The Wiring Validator has a push-button Power switch
to turn it on or off. If the Wiring Validator is turned
on with a single click of the Power button, it will stay
on for about 5 minutes and then automatically turn
itself off to conserve battery power. If the Wiring
Validator needs to be powered on indefinitely, such
as when wire testing is being performed by a single
person, press and hold the Power button for about
3 seconds. The green Power On light shows that the
Wiring Validator is on.
If the Power On light blinks rapidly (about three
times per second), the Wiring Validator or
Fieldbus Monitor is not attached to the wire pair
or the connection is reversed.
If the Power On blinks slowly (about once a
second), there is a good connection to the
wire pair and Fieldbus Monitor, and the Wiring
Validator is in battery save mode (and will
automatically power down in about five minutes).
If the Power On indicator lights continuously, all
connections have been made properly and the
Wiring Validator will stay on until it is manually
powered off. When the Wiring Validator is
turned on, the Fieldbus Monitor powers up and
displays the following readings:
Voltage should be between 9 and 10V
(
continued overleaf
)
•
•
•
•
Use with FBT-6 to measure
signal and noise levels
Test fieldbus wiring before the
control system is installed
◆
◆
Signal generator for testing
fieldbus wiring
Operates with wiring blocks
installed
◆
◆
FBT-5
FBT-6
Cable to be tested
T
Aug 2008
Relcom
