Emerson Rosemount OCX 8800 Reference Manual page 213

Table 8-1: Troubleshooting
Board Temp Hi (Electronics temperature maximum exceeded, > 85 °C (185 °F))
Probable cause
Electronics housing exposed to high ambient temperature
EEPRM Chksm Fail (Non-volatile parameter storage corrupted)
Probable cause
Unit powered down during calibration parameter storage
Flash PROM failure
O2 Temp Low (Oxygen sensor heater temperature low (< 710 °C (1310 °F))
Probable cause
Sensor housing exposed to high wind and/or extreme cold
temperatures
High noise or voltage fluctuation in power supply
COe Temp Low (Combustion sensor heater temperature low, < 290 °C (554 °F))
Probable cause
Sensor housing exposed to high wind and/or extreme cold
temperature
High noise or voltage fluctuation in power supply
SB Temp Low (Sample block heater temperature low, < 150 °C ( 302 °F))
Probable cause
Sensor housing exposed to high wind and/or extreme cold
temperature
High noise or voltage fluctuation in power supply
Line Freq Error (AC power line frequency of usable range, < 45 Hz or > 66 Hz)
Probable cause
High noise or voltage fluctuations in power supply
Electronics package failure
Reference Manual
(continued)
Recommended corrective action
Insulate housing from source of high temperature and/or
install cooling fan to remove heat from housing. Perform
Reset procedure in Chapter 3
Recommended corrective action
Perform Reset procedure in
transmitter and check/trim analog outputs.
Replace electronics package.
Recommended corrective action
Install sensor housing flange insulator (PN 6P0016H201).
Check power supply for line noise or voltage fluctuation.
Install filter power line kit (PN 6A00171G01) or high quality
line filter for input power.
Recommended corrective action
Install sensor housing flange insulator (PN 6P0016H201).
Check power supply for line noise or voltage fluctuation.
Install filter power line kit (PN 6A00171G01) or high quality
line filter for input power.
Recommended corrective action
Install sensor housing flange insulator (PN 6P0016H201).
Check power supply for line noise or voltage fluctuation.
Install filter power line kit (PN 6A00171G01) or high quality
line filter for input power.
Recommended corrective action
Check power supply for line noise or voltage fluctuations.
Install power line filter kit (PN 6A00171G01) or high quality
line filter for power.
Check power supply voltage and compare with line volt-
age. Replace electronics package if they do not agree with-
in 5%.
Troubleshooting
to continue operation.
Chapter 3. Recalibrate the
203