Emerson Rosemount CCO 5500, Reference Manual

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Configuration Problems
(continued)
Table 6-2:
Possible cause Test Result Action
37 Hz square wave approx.
12 V - Not OK Check and rectify wiring/
continuity between power
supply unit and control unit.
Chopper motor failure in
source unit Check if chopper blade is ro-
tating. No Go to next test.
Yes Contact Rosemount.
Replace chopper motor. Fault clears. No further action
Fault continues. Contact Rosemount.
Data Valid LED not illuminated
Analyzer fault condition Interrogate fault status in
Mode
4 .
All Clear
Contact Rosemount.
Fault condition identified Go to relevant symptom.
Reference failure
Reference wave failure Proceed as for symptom 3
(display message
Waiting
for Reference
)
Fault clears. No further action
Fault continues. Contact Rosemount.
Low detector level
Incorrect wiring Check wiring. Fault clears. No further action
Fault continues. Go to next possible cause.
Dirty windows or obstructed
sight path Clean and check the Rx and
Tx windows; clear sight path
between receiver unit and
source unit. Detector levels in range No further action
Fault continues. Go to next possible cause.
Misalignment Realign receiver and source
units. Detector levels in range No further action
Fault continues. Go to next possible cause.
Incorrect gain settings Adjust gains in control unit
and/or receiver unit. Detector levels in range No further action
Fault continues. Go to next possible cause.
Source failure Check heater cartridge. Cartridge open circuit Replace heater cartridge.
Cartridge OK Go to next possible cause.
Source gas cell drive failure Check drive LED in control
unit. LED flashing Go to next test.
LED not flashing Contact Rosemount.
Check gas cell/filter drive. No movement Contact Rosemount.
Movement Contact Rosemount.
Detector saturated
Incorrect gain settings Adjust gain settings in con-
trol unit and/or receiver
unit. Saturation clears. No further action.
Fault continues. Go to next test.
Monitor detector levels
from receiver unit. Signal OK No further action
Signal faulty Contact Rosemount.
Troubleshooting
94 Rosemount CCO 5500