Saeco Xsmall Plus, Service Manual, Page: 22 / 42

Page 6 / 6 Rev. 00 / Jul. 2008 Saeco Int.
04 OPERATING LOGIC XSMALL
4.8 Dose self-learning
The aim of this modi fi 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 modi fi cation will be made.
Min. current (mA) Max. current (mA) Flavour (pluses)
200 300 Mild (- 10% of the average
value)
301 450 Average (nominal)
451 600 Strong (+ 10% of the aver-
age value)
– – pre-ground
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) Max. current (mA) Flavour (pluses)
800 1000 Overwork
1001 - - Pad expulsion