OCX 8800

Instruction Manual

IM-106-880, Rev 1.0 January 2007

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

Flash PROM failure

Perform Reset procedure in Section 3, Configuration and Startup. Recalibrate the OCX and check/trim analog outputs.

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

AC power line frequency is outside the usable range of the OCX universal power supply

Electronics package failure

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.

Line Voltage Low (AC power line voltage below minimum, < 85 VAC)

Probable Cause

Recommended Corrective Action

High noise or voltage fluctuations in power

Check power supply for line noise or voltage fluctuations. Install power line filter kit

supply

(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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Emerson OCX 8800 instruction manual Board Temp Hi Electronics temperature maximum exceeded, 85ºC