86
8 System Operation
8.3.6 Air Deficiency Failure
If the O
2
actual value is significantly smaller than the O
2
setpoint value (below the second
monitoring band) and corrective actions by the VMS cannot clear this error, then the trim is
deactivated and the base value for air deficiency errors will be put out.
At air deficiency, the VMS triggers an air deficiency burner shut-down. Therefore set P 897 to
1.
The error code is H360, "Error shut-down by O
2
trim”.
8.3.7 Resetting O
2
Errors
O
2
errors are automatically reset with each new burner start-up. This is permissible, since a
100 % O
2
measurement test is performed at each start-up.
Manual resetting of O
2
errors is possible at any time, as follows:
Switch (1) to STATUS
VMS in O
2
trim mode?
If not, switch over to O
2
trim mode by pushing channel key 3 (4) upwards
Press the ENTER key (3) and call up the cause of error (mandatory!)
Push key 3 (4) upwards
8.3.8 Calling Fault History O
2
trim
Switch over to VMS / Fuel/Air Ratio Control System mode
(controller of fuel/air ratio control).
Turn selector switch (1) to STATUS
Switch channel 3 down
You can browse through the fault history with
channel key 2
The display of O
2
history disappears automatically after 5
sec.
O
2
controller faults lasting over 30 sec. are stored. They
are only stored in the EEPROM, once the fault is cleared
or the VMS leaves the operating modes ’Controller’ or
’Base firing rate’.
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