Configuration Problems
(continued)
Table 6-2:
Possible cause
Test
Result
Action
Modulation frequency out of range
Chopper motor speed out of
range
Adjust chopper motor
speed.
Modulation frequency in
range
No further action
Unable to adjust
Go to next test.
Monitor reference wave-
form across test points 10
and 11 in power supply unit
using oscilloscope
30 - 45 Hz waveform OK
< 30 or > 45 Hz: waveform
incorrect
Contact Rosemount.
Set call out of range
Calibrated with incorrect
target value or under fluctu-
ating gas level
Calibrate with correct target
value.
Cal factor in range
No further action
Cal factor out of range
Go to next possible cause.
Poor alignment / window
contamination / path ob-
scured
Proceed as for low detector
level
Cal factor in range
No further action
Cal factor out of range
Go to next possible cause.
Source unit gas cell drive
failure
Proceed as for low detector
level.
Cal factor in range
No further action
Cal factor out of range
Go to next possible cause.
D2 detector/circuit failure
Check D2 signal level.
OK
Go to next possible cause.
Not OK
Go to next test.
Monitor D2 signal from Rx.
OK
Not OK
Contact Rosemount.
Source gas cell failure
Replace source unit gas cell. Cal factor in range
No further action
Cal factor out of range
Go to the next possible
cause.
Receiver gas cell failure
Replace receiver unit gas
cell.
Cal factor in range
No further action
Cal factor out of range
Contact Rosemount.
Operational Problems
Table 6-3:
Possible cause
Test
Result
Action
Output reading permanently zero or full scale
Incorrect normalizing pa-
rameter setting
Enter parameter mode and
ensure all parameters are as
required.
Parameters correct
Go to next possible cause.
Parameters incorrect
Enter correct parameters.
Incorrect calibration (Set Cal
value) zero gas level
Enter
DIAGNOSTICS
mode
and observe the Y(60) value.
1800 < Y < 2010
Instrument OK: true level of
gas in duct (output perma-
nently zero)
Y <1800
Go to next possible cause.
Troubleshooting
Reference Manual
95
Summary of Contents for Rosemount CCO 5500
Page 4: ......
Page 8: ...Contents iv Rosemount CCO 5500 ...
Page 28: ...System Wiring Diagram Figure 2 7 Install 20 Rosemount CCO 5500 ...
Page 32: ...Install 24 Rosemount CCO 5500 ...
Page 88: ...Operation 80 Rosemount CCO 5500 ...
Page 98: ...Maintenance 90 Rosemount CCO 5500 ...
Page 108: ...Troubleshooting 100 Rosemount CCO 5500 ...
Page 110: ...Spare parts 102 Rosemount CCO 5500 ...
Page 122: ...Return equipment to the factory 114 Rosemount CCO 5500 ...
Page 123: ...Return equipment to the factory Reference Manual 115 ...
