MSA Senscient ELDS 1000 series, Руководство по эксплуатации

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Problem Solving
Senscient ELDS™
Rev 15 125
GB
7.3. Troubleshooting Tables
Refer to the troubleshooting tables in this section for a list of problems, possible causes and
actions.
Problem / Fault Causes Remedies
Output is 3mA
(LOW SIGNAL) TX or RX alignment
poor for > 24 hours
1) Connect to the RX unit using SITE and check the
signal levels (OSI)
2) If signal levels are low, use the alignment telescope
to correct the RX alignment
3) If signal levels remain low after re-aligning RX,
check the TX alignment using telescope
Heavy contamination
of optics > 24 hours
Check the TX and RX lens-windows for build-up of
contamination. Clean the lens-windows if required.
Visibility along
beam-path very low
for > 24 hours
1) Check that the Transmitter can be seen from the
Receiver. If the Transmitter can be seen, even with
some difficulty, low visibility is unlikely to be the
problem
2) If the Transmitter cannot be seen from the
Receiver, very low visibility could be the problem.
Wait until visibility improves and verify that when
this happens the unit returns to normal status
(4mA).
Output is 2.5mA
(BEAM BLOCK) Beam-path is
blocked
Check that the beam-path is clear from the TX to RX.
Remove any obstruction if present.
TX or RX misaligned 1) Use the alignment telescope to check the alignment
of both the TX and the RX with respect to each
other
2) Make and lock-off any alignment adjustments
required
3) Connect to the Receiver using SITE and check the
signal levels (OSI)
No power (+24V) at
TX
Check that the +24V supply is reaching the TX unit.
Voltage at the unit should be b18V and +32V.
No TX output

Connect to TX using SITE.

Use Diagnostics and Event Log options to establish
if there is a TX fault.
Output is 2mA
(INHIBIT) Unit has not been
installed
Use SITE to complete installation and commissioning of
unit.
Unit has been
Inhibited using SITE
Release output from INHIBIT state using SITE
Unit executing
power-up routine
1) Wait for 1 minute. When power-up routine is
completed satisfactorily the unit’s output should exit
the INHIBIT state
2) If unit remains in INHIBIT, check the +24V supply is
reaching the unit. If the voltage is below +18V or is
fluctuating above and below +18V, the unit may be
being prevented from completing power-up. (This is
an electrical installation problem)