Emerson Rosemount OCX8800 Instruction Manual page 201

Fault Isolation
April 2017
Board Temp Hi (Electronics temperature maximum exceeded, > 85 ºC)
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
Probable Cause
ºC)
Sensor housing exposed to high wind and/
or extreme cold temperatures
High noise or voltage fluctuations in power Check power supply for line noise or voltage fluctuations. Install filter power line
supply
COe Temp Low (Combustion sensor heater temperature low, < 290 ºC)
Probable Cause
Sensor housing exposed to high wind and/
or extreme cold temperatures
High noise or voltage fluctuations in power Check power supply for line noise or voltage fluctuations. Install power line filter
supply
SB Temp Low (Sample block heater temperature low, < 150
Probable Cause
ºC)
Sensor housing exposed to high wind and/
or extreme cold temperatures
High noise or voltage fluctuations in power Check power supply for line noise or voltage fluctuations. Install power line filter
supply
Line Freq Error (AC power line frequency out of usable range, < 45 Hz or > 66 Hz)
Probable Cause
High noise or voltage fluctuations in power
supply
AC power line frequency is outside the
usable range of the OCX universal power
supply
Electronics package failure
Line Voltage Low (AC power line voltage below minimum, < 85 VAC)
Probable Cause
High noise or voltage fluctuations in power
supply
Electronics package failure
Table continued on next page
17
4
Recommended Corrective Action
Insulate housing from source of high temperature and/or install cooling fan to
remove heat from housing. Perform Reset procedure in
Configuration and Startup
Recommended Corrective Action
Perform Reset procedure in Section 3, Configuration and Startup. Recalibrate
the OCX and check/trim analog outputs.
Replace electronics package.
Recommended Corrective
Action
Install sensor housing flange insulator (PN 6P00162H01).
kit (PN 6A00171G01) or high quality line filter for input power.
Recommended Corrective Action
Install sensor housing flange insulator (PN 6P00162H01).
kit (PN 6A00171G01) or high quality line filter for input power.
Recommended Corrective
Action
Install sensor housing flange insulator (PN 6P00162H01).
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 input power.
Correct power supply frequency. AC power line frequency must be between 50
and 60 Hz.
Check power supply frequency with a calibrated oscilloscope or frequency meter
and compare with line frequency. Replace electronics package if they do not
agree within 1 Hz.
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 input power.
Check power supply voltage and compare with line voltage. Replace electronics
package if they do not agree within 5%.
Section 3,
to continue operation.
Instruction Manual
IM-106-880C, OI
Fault
Isolation