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8 Internal Burner Firing Rate Controller
8 Internal Burner Firing Rate Controller
8.1 Purpose
The internal firing rate controller calculates the burner firing rate against a pre-defined setpoint
value (e.g. as a function of temperature or pressure) by comparison with the actual value. This
position will be transferred to the electronic fuel/air ratio control as a default value.
8.2 Brief Description
The integral firing rate control unit is a PID controller with special combustion engineering
functions. You can use it as a fixed value control or as a control by atmospheric condition. The
following signals can be pre-set:
• Actual value (temperaturePT 100 max 320 °C or steam pressure)
• Outside temperature or another analog signal for setpoint shift (only on control by atmos-
pheric condition). The ETAMATIC OEM must be equipped with the optional hardware for
control by atmospheric condition.
• Setpoint switching (via floating contact). The burner firing rate controller releases the com-
bustion internally.
Combustion is triggered internally by the power control unit.
8.3 Range Limits
You must set limit values in the parameters, switching the burner on and off. After a burner
shut-down while actual temperature has not reached the switch-on threshold yet, a display will
inform you that firing rate controller is refusing a start-up.
8.4 Moving Screen "Actual Temperature is too high"
NOTICE
The limit values should always be entered in the form of a difference from the setpoint value.
8.5 How to Change the Burner-Firing-Rate Controller with the Customer Interface
Keep pressing the HAND key for more than 5sec., to switch the customer interface to the
mode „set setpoints of burner firing rate controller“. This is only possible when burner firing
rate controller is activated. At the same time, the HAND mode for manual firing rate input ends.
In the mode „setting firing rate controller“ the LED in the manual-key flashes. The lower display
line shows the output regulator adjustment, the setpoint value and the actual value.
press key F3 MANUAL to start the ETAMATIC OEM, even if the display shows the
running text, subject to the condition, that the maximum temperature is not
exceeded.
press key F3 MANUAL again to switch back to automatic mode.
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