Emerson ROSEMOUNT OCX 8800 - Manual (Page 106)

Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
7-8
Board Temp Hi (Electronics temperature maximum exceeded, > 85ºC)
Probable Cause Recommended Corrective Action
Electronics housing exposed to high ambient
temperature Insulate housing from source of high temperature and/or install cooling fan to remove
heat from housing. Perform Reset procedure in Section 3, Configuration and Startup to
continue operation.
EEPRM Chksm Fail (Non-volatile parameter storage corrupted)
Probable Cause Recommended Corrective Action
Unit powered down during calibration parameter
storage Perform Reset procedure in Section 3, Configuration and Startup. Recalibrate the OCX
and check/trim analog outputs.
Flash PROM failure Replace electronics package.
O2 Temp Low (Oxygen sensor heater temperature low, < 710ºC)
Probable Cause Recommended Corrective Action
Sensor housing exposed to high wind and/or
extreme cold temperatures Install sensor housing flange insulator (PN 6P00162H01).
High noise or voltage fluctuations in power
supply Check power supply for line noise or voltage fluctuations. Install filter power line kit
(PN 6A00171G01) or high quality line filter for input power.
COe Temp Low (Combustion sensor heater temperature low, < 290ºC)
Probable Cause Recommended Corrective Action
Sensor housing exposed to high wind and/or
extreme cold temperatures Install sensor housing flange insulator (PN 6P00162H01).
High noise or voltage fluctuations in power
supply Check power supply for line noise or voltage fluctuations. Install power line filter kit
(PN 6A00171G01) or high quality line filter for input power.
SB Temp Low (Sample block heater temperature low, < 150ºC)
Probable Cause Recommended Corrective Action
Sensor housing exposed to high wind and/or
extreme cold temperatures Install sensor housing flange insulator (PN 6P00162H01).
High noise or voltage fluctuations in power
supply Check power supply for line noise or voltage fluctuations. Install power line filter kit
(PN 6A00171G01) or high quality line filter for input power.
Line Freq Error (AC power line frequency out of usable range, < 45 Hz or > 66 Hz)
Probable Cause Recommended Corrective Action
High noise or voltage fluctuations in power
supply Check power supply for line noise or voltage fluctuations. Install power line filter kit
(PN 6A00171G01) or high quality line filter for input power.
AC power line frequency is outside the usable
range of the OCX universal power supply Correct power supply frequency. AC power line frequency must be between 50 and
60 Hz.
Electronics package failure 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.
Line Voltage Low (AC power line voltage below minimum, < 85 VAC)
Probable Cause Recommended Corrective Action
High noise or voltage fluctuations in power
supply Check power supply for line noise or voltage fluctuations. Install power line filter kit
(PN 6A00171G01) or high quality line filter for input power.
Electronics package failure Check power supply voltage and compare with line voltage. Replace electronics
package if they do not agree within 5%.
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