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5797 344 - 01
Vitoflex 300-UF Installation & Operating
Parameter
Fuel
(continued)
Parameter
Description
Setting
range
Standard
value:
“Delay, O
2
, heat-up”
Length of time for which ignition is monitored in the
“Ignition” operating state
The boiler switches to the “Load” operating state if the
O
2
value drops below 15% during this set time.
Setting in seconds
10 to 300
90
“Cycle, maintaining”
Left entry field
Cycle time in the “Maintaining”, “Standby” and
“Burnout” operating states
The feed screw conveyor runs until the feed system is
empty.
Setting is a % of the system’s inherent maximum cycle
time for fuel feed
0.1 to 10
5
“Cycle, emergency mode”
Right entry field
Cycle time in the “Emergency burnout” operating state
Setting is a % of the system’s inherent maximum cycle
time for fuel feed
1 to 100
30
“Minimum cycle, feed screw
conveyor”
Left entry field
Lower cycle time limit in the “Load” and “Burnout”
operating states
If a value greater than the maximum cycle for the feed
screw conveyor has been entered, the controller
automatically changes to a value 1 % below the
maximum cycle.
Setting is a % of the system’s inherent maximum cycle
time for fuel feed
0 to 99
20
“Maximum cycle, feed screw
conveyor”
Right entry field
Upper cycle time limit in the “Load” and “Burnout”
operating states
Setting is a % of the system’s inherent maximum cycle
time for fuel feed
1 to 100
100
“Limit temperature, feed pipe”
Feed temperature at which safety measures are initiated.
If the temperature at the feed pipe reaches the selected
temperature limit, the warning message “Feed warm” is
displayed. If the temperature at the feed pipe continues
to rise, a fault message is displayed and the feed is
switched on to move fuel into the combustion chamber.
Setting in °C
20 to 90
70
“Firebed/delay”
Switching delay for firebed monitoring in the combustion
chamber. After the firebed light barrier has triggered in
the combustion chamber, the fuel feed stops after the
set time has elapsed.
Setting in seconds
10 to 600
100
“Firebed/cycle ramp”
After the firebed light barrier has triggered in the
combustion chamber, the feed cycle is ramped down
in steps of 0.5% each. The cycle continues to be
ramped down until 50% of the current cycle is reached.
“Firebed/cycle ramp” is used to set the interval between
each rampdown step.
Setting in seconds
10 to 600
20
“Feed” tab
(continued)
