Honeywell Searchline Excel Open-Path Technical Handbook page 79

MAN0530 Issue 09 October 03
2104M0506
Fault/Problem Causes
Wrong communication mode 1)
Comms Error
reported by selected on the Interrogator
Interrogator
Interrogator software version Version 1V00 Interrogator software to be used with Excels
software
is incompatible with Excel
software version
Incorrect communication
connection
Excel unit is not powered up Check that the +24V supply is reaching Excel unit correctly.
Interrogator battery low
Interrogator The installation has failed to 1)
Installation meet the acceptable criteria
Failed message of the Instrument Assisted
when attempting Alignment (IAA) check
initialisation
6. PROBLEM SOLVING
Remedies
Select Change Mode option on the Interrogator.
2) Change the communication mode to Excel.
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 versions of Interrogator software is 4V0.
This versions work with 3V0 and higher Excels, Optima
and Optima Plus.
1) Check that Interrogator is correctly plugged into the IS
socket on the DVC100/DX100/DX100 (M) junction
box.
2) Check that the RS485 A and B wires from the Excel
unit have been connected to the correct terminals
inside the DVC100/DX100/DX100 (M) junction box.
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.
Check that the signal levels reaching the Receiver are
greater than 0.7 and less than 1.5.
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.
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Searchline Excel