Honeywell Searchline Excel Cross-Duct, Техническое руководство

Страница: 81 / 124

81
MAN0530 Issue 09 October 03 Searchline Excel
2104M0506
6. PROBLEM SOLVING
Fault/Problem Causes Remedies
Diagnostics Receiver misaligned 1) Re-align the Receiver, first using the telescope and
report then using the Interrogator.
Neg Gas 2) Re-zero the unit.
Reading
Contamination of windows
1) Check the Transmitter and Receiver windows for build
up of contamination. Clean windows if required. See
Chapter 5
.
2) Re-zero the unit.
Negative drift of unit’s zero Re-zero the unit.
position
Diagnostics Receiver misaligned
1) Re-align the Receiver, first using the telescope and
report
then using the Interrogator.
Baseline Drift
2) Re-zero the unit.
Contamination of windows
1) Check the Transmitter and Receiver windows for build
up of contamination. Clean windows if required.
2) Re-zero the unit.
Drift of unit’s baseline Re-zero the unit
Diagnostics Unit has been operated at a
1) When Ex certified equipment is operated outside its
report temperature outside its
certified range, its type approval certification is
Bad specified and certified range
invalidated along with its warranty. Such equipment
Temperature
should be removed from service in potentially
explosive atmospheres.
2) Investigate the cause of the excessive temperature
excursion and take steps to prevent recurrence.
(e.g. fit sunshade or heat-shield, or relocate detector,
etc.)
Diagnostics Incorrect supply voltage 1) Check that the +24V supply voltage reaching the unit
report reaching unit (it should be b18V and +32V).
Supply Fault 2) Identify the cause of incorrect supply voltage reaching
the unit and rectify.
Diagnostics Fault on the unit's digital If this fault is displayed when the unit is interrogated, it cannot
report PCB be remedied in the field.
DSP Fault
Diagnostics A fault has been detected in If this fault is displayed when the unit is interrogated, it cannot
report the NV-RAM be remedied in the field.
NV-RAM Fault
Diagnostics The time and date record 1) Re-enter the time and date using the Interrogator.
report being stored by the Real 2) Cycle the power applied to the unit.
RTC Fault Time Clock (RTC) has been 3) Verify that the time and date record was maintained
lost after cycling the power.
Diagnostics Voltage reference fault If this fault is displayed when the unit is interrogated, it cannot
report detected be remedied in the field.
Volt Ref Fault