Chapter 6 Troubleshooting; Hardware Alarms - Emerson Rosemount 700XA Reference Manual

Reference Manual
2-3-9000-744
6 Troubleshooting
The information is arranged either by major subsystems or by major functions of the gas
chromatograph (GC).
Note
Correct all alarms before recalibrating.
6.1

Hardware alarms

Use LTLOI Failure
the alarm, potential cause, and solution for the problem.
6.1.1 LTLOI Failure
Recommended actions
6.1.2 Maintenance Mode
A technician has put the gas chromatograph (GC) into Maintenance mode for servicing.
Recommended action
To disable Maintenance mode, deselect the Maintenance Mode check box in the
System dialog.
6.1.3 Power Failure
Potential cause
The gas chromatograph (GC) has experienced a restart, caused by a power failure, since
alarms were last cleared.
Recommended action
Allow the GC to automatically restart in Warm Start mode.
During Warm Start mode, the GC does the following:
After completing these actions, the GC switches to auto-sequence mode.
Rosemount 700XA
through Flame Photometric Detector Board 1 Comm Failure
1. Power the gas chromatograph (GC) down completely.
2. Check that the local operator interface (LOI) is connected to the backplane
board at one end and the LOI board at the other end.
3. Power up the GC.
4. If the message appears again, replace the LOI board.
a. Waits for the heaters to stabilize.
b. Purges the sample loop.
c. Actuates the valves for two cycles.
Troubleshooting
June 2022
to identify
183