Remedying A Hardware Fault - Fuji Electric FLR-3 Instruction Manual

c) There is white noise all around.
Waveform with the overall noise
Measurement can be performed if the noise level is smaller than the received waveform level (0.75V
Noise is placed on the power line.
Noise is placed on the grounding line (panel earth,
etc).
Dedicated cable is picking the inductive noise.
The distance between the detector and the flow
transmitter is long, and dedicated cable length is long.
Insufficient sensitivity
Signal power (AGC_U, AGC_D) 45% or less
Flow transmitter
Ground

6.5.7. Remedying a hardware fault

If the hardware is found faulty as a result of Section 6.5.1 to Section 6.5.6 above, provide specific details to Fuji Electric.
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<Cause>
d) Pulsed noise is observed.
Waveform with pulsed noise on the signal line
<Check>
Check the power line using an oscilloscope, and
install a noise-suppression transformer.
Check the power line using an oscilloscope, and
remove the ground wire.
Move the flow transmitter near the detector and
perform confirmation.
Keep the dedicated cable apart from the power cable.
Perform grounding according to the figure below.
Change the detector.
FSSA → FSSC
Detector
Outer shielding of the
dedicated cable is grounded
Ground
to the earth.
).
0-p
INF-TN3FLR-E