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7 Internal Burner Firing Rate Controller
7.10 Setpoint Changeover
You can switch the setpoint with the input "setpoint switchover". If you use a version with fixed
setpoint value it is possible to select one of the two values, which are entered in the parame-
ters 796 and 798 with this contact.
If you have activated the control by atmospheric conditions additionally, you can select be-
tween two pairs of limit values (see control by atmospheric conditions and limit ranges). The
parameters for setpoint 1 (for setpoint switching) and setpoint min. 1 (for control by atmos-
pheric conditions) are equal. Likewise the parameters setpoint 2 and setpoint min. 2. The cor-
responding content is assigned according to the configuration.
When activating the "control by atmospheric conditions” option and setting the adjustable pa-
rameters, you may realise an external setpoint default. In other words, the setpoint can be ad-
justed manually or automatically via a potentiometer (or switched through resistors). By
connecting a change-over switch, you can implement a night-time reduction instead of control
by atmospheric conditions. A control by atmospheric conditions and a night-time reduction can
be realised simultaneously, if you combine the control by atmospheric conditions with the set-
point switching.
Nr. FMS ETA Short Text Description Min Max Default
796 0 0 Soll1min Controller setpoint 1 minimum 0 999 90
Firing rate controller setpoint 1 minimum (setpoint 1) in °
C or bar (xx.x)
Set the minimum value for the first controller setpoint
(active if input "set point switching" = 0) (weather guided
controller) in this parameter. If the firing rate controller is
configured as a constant controller, the set point is set
here.
"Set point input via front panel"
1.Selection switch: firing rate value
2.Display: controller setpoint, controller actual value,
firing rate setpoint, internal firing rate
3.Channel key 3 down and channel key 4 up at the
same time
4.Controller setpoint starts to flash and the setpoint can
be changed with channel key 2
5.Do not save value: channel 3 up and channel 4 down
at the same time or switch off burner
6.Save value: save the setpoint to the minimum value
parameter with the Enter key (in P 796 / P 798
depending on the setpoint switching input)
Saving is only possible with constant controller.
With control by atmospheric conditions you may set the
firing rate controller setpoint value default manually
Activation of the controller setpoint modification is disa-
bled when operating mode is OFF. You may not trigger
the burner start by shifting the switching point.
refer to figure "Control by Atmospheric Conditions / Set-
point Switching of the Firing Rate Controller"
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