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MAN0530 Issue 15 - 07/17
2104M0506
Fault/Problem
Causes
Comms Error
Wrong communication mode
reported by
selected on the Interrogator
Interrogator
software
Interrogator software version
is incompatible
with Excel software version
Incorrect communication
connection
Excel unit is not powered up
Interrogator battery low
Interrogator
The installation has failed to 1) Check that the signal levels reaching the
Installation
meet the acceptable criteria Receiver are greater than 0.7 and less than 2.0.
Failed message
of the Instrument Assisted
when attempting Alignment (IAA) check
initialisation
5. PROBLEM SOLVING
Remedies
1) Select Change Mode option on the Interrogator.
2) Change the communication mode to Excel.
Version 1V00 Interrogator software to be Excels
running 1V0 software.
Version 2V0 Interrogator software can be used with
Excels running 2V0 software or higher.
Version 3V0 and 3V1 Interrogator software can be
used with Excels running 3V0 software or higher.
The latest version of Interrogator software is
greater than 4V0. This version works with 3V0 and
higher Excels, Optima and Optima Plus. CSA/FM
versions of the SHC-1 are programmed with
version 4V1 of the interrogator software, which
displays the units of measurement for the
Cross-Duct version as %LEL/m.
1) Check that Interrogator is correctly plugged
into the IS socket on the DX100(M) oe OELD
junction box.
2) Check that the RS485 A and B wires from the
Excel unit have been connected to the correct
terminals inside the DX100(M) or OELD
junction box.
Check that the +24V supply is reaching Excel
unit correctly. The Supply voltage at unit should be
between +18V and +32V.
Check the Interrogator battery and replace if low.
See Appendix A. Section A.4.3.
2) Check that the correct range has been entered for
the installed path length.
3) Check that the alignment of the Receiver has been
fully optimised.
The received signals must be peaked up to the
maximum achievable. Adjusting the alignment until the
signals are just above the minimum signal threshold
and then leaving it at that is poor practice and will not
always result in an installation that passes the IAA
check criteria.
4) Check the alignment of the Transmitter.
5) Check that there are no objects obscuring part or all
of the beam path.
6) Check that the windows of both the Receiver and
the Transmitter are clean.
7) Check that the structures that the Transmitter and
Receiver are mounted on are stable and free from
significant angular movement/vibration.
8) Check that there is no gas in the beam - which
prevents successful zeroing.
9) Installation will fail in conditions of low visibility or
fluctuating atmospheric transmission - which degrade
signal quality. Do not attempt installation during
conditions of heavy rain, snow or fog.
65
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