66
When the flue temperature rises above the high alarm value for the selected profile combination, a
fault number will appear. See section xxx for details of fault numbers.
Option 39.0 - Oxygen alarm select (0 – 2)*
Option parameter 39.0 is only available when option 30.0 (oxygen input select) is not set to zero.
Since the oxygen alarm values relate to the oxygen setpoint values, oxygen setpoint values must first
be entered in adjust ratio mode.
0
- Alarms disabled. Oxygen low and high alarms are disabled.
1
- Alarms enabled, no safety shutdown. Oxygen low and high alarms are enabled and
option parameters 39.1 to 42.7 will become available. If an alarm value is exceeded, a
fault number will appear but no safety shutdown will occur.
2
- Alarms enabled with safety shutdown. Oxygen low and high alarms are enabled and
option parameters 39.1 to 42.7 will become available. If an alarm value is exceeded, a
fault number will appear and a safety shutdown will occur.
Options 39.1 to 39.7 - Oxygen low alarm values at low fire (0.0 – 99.9%)*
Options 40.1 to 40.7 - Oxygen low alarm values at high fire (0.0 – 99.9%)*
Options 41.1 to 41.7 - Oxygen high alarm values at low fire (0.0 – 99.9%)*
Options 42.1 to 42.7 - Oxygen high alarm values at high fire (0.0 – 99.9%)*
Using option parameters 39.1 to 40.7, it is possible to set different oxygen alarm values at high fire
and low fire for each profile.
At firing positions other than high and low fire, the alarm limit is interpolated between the two
points. For example, if the oxygen limit has been entered as 5% of setpoint at low fire and 10% of
setpoint at high fire, the limit at mid fire will be 7.5%.
The alarm limits may set to any value between 0.0 and 99.9%, where the value entered relates to a
percentage deviation from each oxygen setpoint in the firing range.
If the burner is firing, it is only possible to make an adjustment to the option parameters which relate
to the selected profile. If the burner is not firing, the alarm values for any profile selection may be
adjusted.
An oxygen low alarm will be caused by one or more of the following events:
•
The level drops below 0.5% O2 for 30 seconds
•
The level drops below the low alarm limit for 2 minutes
•
The level drops below twice the low alarm limit for 30 seconds
An oxygen high alarm will be caused by one or more of the following events:
•
The level rises above the high alarm limit for 2 minutes
•
The level rises above twice the high alarm limit for 30 seconds
Option 43.0 – Fuel flow select (0 / 1)*
Options 43.1, 43.2, 43.3 – High fire fuel flow, fuels 1, 2, 3 (0 – 999 / 0.0 – 99.9 units per hour)*
Option 43.0 defines the function as below:
0 - Totalized and instantaneous fuel flow not calculated.
1 - Totalized and instantaneous fuel flow calculated using the values entered in option
parameters 43.1 – 43.3, with units of XXX per hour. Flow values must be entered for the
fuel flow to be calculated.
2 - Totalized and instantaneous fuel flow calculated using the values entered in option
parameters 43.1 – 43.3, with units of XX.X per hour. Flow values must be entered for
the fuel flow to be calculated.
