Emerson OCX 8800 Instruction Manual page 106

OCX 8800
SB Temp Hi (Sample block heater temperature high, > 190ºC)
Probable Cause
High noise in OCX power supply
O2 Temp Very Hi (Oxygen sensor heater over maximum temperature, > 820ºC)
O2 Htr Rmp Rate (Oxygen sensor heater over maximum temperature ramp rate)
Probable Cause
Incorrect O heater wiring
2
Incorrect O thermocouple wiring
2
Electronics package failure
COe Temp Very Hi (Combustion sensor heater over maximum temperature, > 400ºC)
COe Htr Rmp Rate (Combustibles sensor heater over maximum temperature ramp rate)
Probable Cause
Incorrect COe heater wiring
Incorrect COe thermocouple wiring
Electronics package failure
SB Temp Very Hi (Sample block heater over maximum temperature, > 260ºC)
SB Htr Rmp Rate (Sample block heater over maximum temperature ramp rate)
Probable Cause
Incorrect sample block heater wiring
Incorrect sample block thermocouple wiring
Electronics package failure
O2 TC Open (Oxygen sensor heater thermocouple open)
Probable Cause
O thermocouple or thermocouple circuit open
2
COe TC Open (Combustibles sensor heater thermocouple open)
Probable Cause
Combustibles sensor thermocouple open
8-4
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.
Recommended Corrective Action
Check O heater wiring per Figure 8-3 and Figure 7-4. Check the wiring at the heater
2
and inside the electronics housing. Correct wiring fault. Perform Reset procedure in
Section 3, Configuration and Startup to continue operation.
Check O thermocouple wiring per Figure 8-3 and Figure 7-4. Check the wiring at the
2
thermocouple and inside the electronics housing. Correct wiring fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Replace electronics package.
Recommended Corrective Action
Check COe heater wiring per Figure 8-3 and Figure 7-5. Check the wiring at the heater
and inside the electronics housing. Correct wiring fault. Perform Reset procedure in
Section 3, Configuration and Startup to continue operation.
Check COe thermocouple wiring per Figure 8-3 and Figure 7-5. Check the wiring at the
thermocouple and inside the electronics housing. Correct wiring fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Replace electronics package.
Recommended Corrective Action
Check sample block heater wiring per Figure 8-3 and Figure 7-4. Check the wiring at
the heater and inside the electronics housing. Correct wiring fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Check sample block thermocouple wiring per Figure 8-3 and Figure 7-4. Check the
wiring at the thermocouple and inside the electronics housing. Correct wiring fault.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
Replace electronics package.
Recommended Corrective Action
Check O thermocouple and circuit wires for breaks or loose connections per Figure 8-3
2
and Figure 7-4. Repair breaks or loose connections or replace failed thermocouple.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
Recommended Corrective Action
Check thermocouple resistance (lead to ground) of reference and active thermocouples
per Figure 8-3 and Figure 7-5. If either thermocouple is open or shorted to ground,
replace combustibles sensor.
Table continued on next page
Instruction Manual
IM-106-880, Rev 1.0
January 2007