Dose Self-Learning - Saeco Xsmall Plus Service Manual

04 OPERATING LOGIC
4.8

Dose self-learning

The aim of this modifi cation process is to ensure that, with an algorithm based on three pieces
of information (listed below) detected by the machine P.C.B., the average dose is adjusted
automatically (SELF-LEARNING).
1. Number of coffee grinder pulses taking place during the grinding cycle
2. Max. average value of the power consumed by the gear motor during the coffee
brewing cycle
3. Flavour selected by the user
The algorithm compares the maximum average value of the power consumed by the unit with
the value listed in the table for the selected fl avour, in order to calculate the new grinding pulse
value for the next coffee produced.
If the value of the power consumed by the gear motor is lower than the value of the min. cur-
rent, the grinding pulses will be increased by 2.
If the value of the power consumed by the gear motor is greater than the value of the maxi-
mum current, the grinding pulses will be decreased by 4.
If the "pre-ground" fl avour is selected by the user, no modifi cation will be made.
Min. current (mA)
200
301
451
–
If the value of the power consumed by the gear motor falls within the "overwork" interval, the
grinding pulses will be decreased by 10 and the product will be dispensed.
If the value of the power consumed by the gear motor falls within the "expulsion" interval, the
grinding pulses will be decreased by 10 and the pad will be dispensed.
Min. current (mA)
800
1001
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Max. current (mA)
300 Mild (- 10% of the average
value)
450 Average (nominal)
600 Strong (+ 10% of the aver-
age value)
– pre-ground
Max. current (mA)
1000 Overwork
- - Pad expulsion
Rev. 00 / Jul. 2008
XSMALL
Flavour (pluses)
Flavour (pluses)
Saeco Int.