B&R 2AO300.6 Relay input module

The LEARN process is not subject to the 8 hour burn-in and therefore will always be available. If the LEARN process is activated at STANDBY, the LEARN process will involve both pilot and main flame. If the LEARN process is activated during the main firing period (AUTO) the LEARN process will only involve the main flame learn. That is, during this LEARN process in AUTO, the thresholds for pilot flame are not affected. The advantage of the separate learn is to take into effect the possibility that the characteristics of the main flame might change due to changes in background conditions after a long firing period. 

Once a LEARN process is activated

it cannot be undone. Also, if a LEARN cannot be completed in the subsequent burner cycle due to burner interruptions or a flame fail, the LEARN process will continue to remain active. During PTFI, the LEARN process takes place during the last 3 seconds of the pilot period and is indicated on the display: PTFI 80 LEARNING FLAME During AUTO the LEARN process takes place during the first 3 seconds of AUTO and is indicated on the display

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