Sensor - Bosch WAT28400 Repair Instructions

Design and function
3.8 3D sensor
3.8.1 Structure
Fig. 7: Components of the 3D sensor
1 Holder
2 Permanent magnet
The 3D sensor consists of 3 Hall elements and a microcontroller. The Hall
elements are arranged in such a way that the 3 spatial axes are measured.
Fig. 8: Function of the 3D sensor
2017-05-22 / DIS 113_58300000186503_ara_en_c
3 3D sensor
Copyright by BSH Hausgeräte GmbH
The permanent magnet is installed in the appliance near the 3D sensor.
3.8.2 Function
The 3D sensor uses the Hall effect.
If the drum drops due to the load or is deflected during the spin cycle, the position
of the permanent magnet moves with respect to the 3D sensor. This changes the
effect of the magnetic field on the Hall elements. The Hall elements generate Hall
voltages. The electronics evaluate the voltages.
In the case of appliances in which one 3D sensor and one 3G
sensor are fitted, the unbalanced load detection is monitored using
the 3G sensor.
The 3D sensor only monitors the load of the drum.
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