Emerson Rosemount OCX8800A - Page 221

Potential cause
High noise in Rosemount OCX8800 power supply.
Recommended actions
1. Check power supply for line noise or voltage fluctuations.
2. Install power line filter kit (PN 6A00171G01) or high quality line filter for
input power.
9.3.6 O2 Temp Very Hi or O2 Htr Rmp Rate
Oxygen sensor heater over maximum temperature, > 1508 °F (820 °C) or oxygen
sensor heater over maximum temperature ramp rate.
Potential cause
Incorrect O
2
heater wiring.
Recommended actions
1. Check O
2
heater wiring per Figure 9-2 and Figure 10-8.
2. Check the wiring at the heater inside the electronics housing.
3. Correct wiring fault.
4. Perform procedure in Reset to continue operation.
Potential cause
Incorrect O
2
thermocouple wiring.
Recommended actions
1. Check O
2
thermocouple wiring per Figure 9-2 and Figure 10-8.
2. Check the wiring at the terminal and inside the electronics housing.
3. Correct wiring fault.
4. Perform procedure in Reset to continue operation.
Potential cause
Electronics package failure.
Recommended action
Replace electronics package.
9.3.7
COe Temp Very Hi or COe Htr Ramp Rate
Combustion sensor heater over maximum temperature, > 752 °F (400 °C). or
combustibles sensor heater over maximum temperature ramp rate.
Potential cause
Incorrect COe heater wiring.
Manual
Troubleshoot
00809-0500-4880 December 2022
Rosemount OCX8800A 221