Emerson Process Management 3000 - Manual (Page 85)

Instruction Manual
IB-106-300NH Rev. 4.2
July 2002
Rosemount Analytical Inc. A Division of Emerson Process Management Troubleshooting 6-1
World Class 3000
SECTION 6
TROUBLESHOOTING
6-1 OVERVIEW
The system troubleshooting describes how to
identify and isolate faults which may develop in
the Oxygen Analyzer System. Refer to Probe,
IFT, HPS, MPS, and HART Communicator
appendices.
Install all protective equipment covers
and safety ground leads after trouble-
shooting. Failure to replace covers
and ground leads could result in seri-
ous injury or death.
6-2 SPECIAL TROUBLESHOOTING NOTES
a. Grounding
It is essential that adequate grounding pre-
cautions are taken when the system is be-
ing installed. A very thorough check must
be made at both the probe and electronics
to ensure that the grounding quality has not
degraded during fault finding. The system
provides facilities for 100% effective
grounding and the total elimination of
ground loops.
b. Electrical Noise
The IFT has been designed to operate in
the type of environment normally found in a
boiler room or control room. Noise suppres-
sion circuits are employed on all field termi-
nations and main inputs. When fault finding,
the electrical noise being generated in the
immediate circuitry of a faulty system should
be evaluated. All cable shields must be
connected to earth.
c. Loose Integrated Circuits
The IFT uses a microprocessor and sup-
porting integrated circuits. Should the elec-
tronics unit receive rough handling during
installation in a location where it is sub-
jected to severe vibration, an Integrated
Circuit (IC) could work loose. The fault find-
ing guides in paragraph 6-3 and Table E-2
in Appendix E, show the resulting variety of
failure modes. It is recommended that all
IC's be confirmed to be fully seated before
troubleshooting on the system begins.
d. Electrostatic Discharge
Electrostatic discharge can damage the IC's
used in the electronics unit. It is essential
that the user ensure he/she is at ground
potential before removing or handling the
processor board or the IC's used on it.
6-3 SYSTEM TROUBLESHOOTING
The status line of the GUI equipped IFT will dis-
play one of ten conditions. The system status
displays will be displayed one at a time in prior-
ity sequence, as indicated in Table 6-1.
6