ABB ACF5000 Manual page 193

Flame does not ignite
FID in fail-safe status
ACF5000 FTIR ANALYZER SYSTEM
Air in the combustion gas line
When connecting or replacing the combustion gas bottle make sure that no
air penetrates into the combustion gas supply line. Air which has penetrated
the gas supply line results in the flame in the analyzer going out.
The analyzer module automatically tries to reignite the flame up to 10 times
in a period of approx. 10 minutes with increased combustion gas pressure
each time. If this is unsuccessful, the analyzer module switches to operating
condition "Wait for restart". In this case, ignition of the flame must be re-
started:
Menu → Service/Test → Analyzer Spec. Adjustment →
Standby/Restart FID
Note: The Wait for restart operating condition means: heating on, combus-
tion gas valve closed, instrument air valve open, housing purging on.
If a serious fault has occurred in the FID, it is put in fail safe status; in the
menu Standby/Restart FID the indication Fail safe appears for the
parameter Status.
Fail-safe mode means: heater off, combustion gas valve closed, instrument
air valve closed, housing purging on, emergency purge activated.
The cause of the failure must be determined from the status messages
(see page 179)
A cold restart in the menu is not possible; after fault correction the analyzer
module must be cold restarted by switching off and on again.
| OI/ACF5000-EN REV. A 193