Emerson OCX 8800 Instruction Manual page 107

Instruction Manual
IM-106-880, Rev 1.0
January 2007
SB TC Open (Sample block heater thermocouple open)
Probable Cause
Sample block thermocouple or thermocouple
circuit open
O2 TC Shorted (Oxygen sensor heater thermocouple shorted)
Probable Cause
O thermocouple or thermocouple circuit shorted
2
Slow heatup during cold start
COe TC Shorted (Combustibles sensor heater thermocouple shorted)
Probable Cause
Combustibles sensor thermocouple shorted
Slow heatup during cold start
SB TC Shorted (Sample block heater thermocouple shorted)
Probable Cause
Sample block thermocouple or thermocouple
circuit shorted
Slow heatup during cold start
O2 TC Reversed (Oxygen sensor heater thermocouple reversed)
Probable Cause
O thermocouple wires reversed
2
COe TC Reversed (Combustibles sensor block heater thermocouple reversed)
Probable Cause
Combustibles thermocouple wires reversed
SB TC Reversed (Sample block heater thermocouple reversed)
Probable Cause
Sample block thermocouple wires reversed
Recommended Corrective Action
Check sample block thermocouple and circuit wires for breaks or loose connections per
Figure 8-3 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 O thermocouple and circuit wires for short circuit condition per Figure 8-3 and
2
Figure 7-4. Repair shorted wiring or replace failed thermocouple. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
If alarm persists, refer to the O2 Htr Failure alarm procedure.
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.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
If alarm persists, refer to the COe Htr Failure alarm procedure.
Recommended Corrective Action
Check sample block thermocouple and circuit wires for short circuit condition per
Figure 8-3 and Figure 7-4. Repair shorted wiring or replace failed thermocouple.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
If alarm persists, refer to the SB Htr Failure alarm procedure.
Recommended Corrective Action
Check O thermocouple wiring per Figure 8-3 and Figure 7-4. Check the wiring at the
2
sensor and inside the electronics housing. Correct reversed-wires fault. Perform Reset
procedure in Section 3, Configuration and Startup to continue operation.
Recommended Corrective Action
Check combustibles thermocouple wiring per Figure 8-3 and Figure 7-5. Check the
wiring at the sensor and inside the electronics housing. Correct reversed-wires fault.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
Recommended Corrective Action
Check sample block thermocouple wiring per Figure 8-3 and Figure 7-4. Check the
wiring at the sensor and inside the electronics housing. Correct reversed-wires fault.
Perform Reset procedure in Section 3, Configuration and Startup to continue operation.
Table continued on next page
OCX 8800
8-5