ADL 2010 / 01 25/57 599 72 63-27
7.2 Conductivity sensor
These electronics use a conductivity sensor, comprising an electronic circuit (located inside the main circuit
board) and a part outside the board comprising wiring cables, two brushes (contact sensors for the drum
half-casings) and the two half-casings themselves.
The brush in contact with the front half-casing (2)
is fixed in a swinging support to the conduit, and is
wired to the circuit board; the other brush is in
contact with the drum pin (3) inserted in the drum
pin guard (4); connection of this sensor to the
circuit board (1) takes place via the unit which acts
as the earthing system for the appliance's electonic
circuit.
As the drum is divided into two parts by an
insulating strip, there is an infinite impedence
between the front and rear half-casings (to which
the sensors are connected) when it is empty;
whereas its value is influenced by the load of
washing, the type of fabric and the level of
humidity in the drum.
The impedence value is approximately 1MΩ ÷
25M.ΩThis value is transformed into an oscillation
of ~ 260Hz ÷ 0Hz, which when read and processed
by the electronic circuit (fuzzy logic) determines
the duration and final humidity level for the chosen
cycle.
7.3 Junction box with integrated anti-disturbance filter
YELLOW label
CX = 0.25 µF
CY = 0.27 µF
R = 1 MΩ
FAWN label
C = 0.1 µF
CYAN label
CX = 0.25 µF
CY = 0.0047 µF
R = 1 MΩ
WHITE label
CX = 0.1 µF
CY = 0.0025 µF
R = 2.2 MΩ
The anti-disturbance filter (inserted into the junction box) has the job of preventing any radio disturbance
generated inside the tumble dryer from entering the power supply line.
This device only works correctly if connected to a proper earthing system.
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