Power Supply To Motor; Anti-Foam Control System - Electrolux EWF1284EDW Service Manual

11.8.3 Power supply to motor

The PCB powers the motor via a triac; changes in the direction of
rotation are achieved by switching the contacts on the two relays
(K3-K4), which change the connection between the rotor and the
stator. In certain models, a third relay (K5) is used to power the
stator (full or half field) according to the spin speed. The motor
speed is controlled by the signal from the tachometric generator.
During the spin phases, the micro-processor performs the anti-
foam and the anti-balancing check procedure.
1. Main electronic circuit board
2. Door safety interlock
7. Universal motor
7a. Tachometric generator (motor)
7b. Stator (motor)
7c. Rotor (motor)
7d. Thermal cut-out (motor)
1. Main electronic circuit board
2. Door safety interlock
7. Universal motor
7a. Tachometric generator (motor)
7b. Stator (motor)
7c. Rotor (motor)
7d. Thermal cut-out (motor)

11.8.4 Anti-foam control system

The anti-foam control procedure is performed using the electronic pressure switch.

Spin with little foam: if the pressure switch senses a "full" level, the spin phase is interrupted, the drain
pump continues to operate and, when the pressure switch senses "empty", the spin phase is resumed.

Spin with excess foam in the tub (critical situation): this is recognised if the pressure switch senses full
level on 5 occasions (five spin interruptions). If this occurs, the spin phase is skipped, and a one-minute
drain cycle is performed with the motor stationary and, in the case of a washing phase, a supplementary
rinse is added.
Technical Support - MDM
EWM09312 Diagram
EWX13611 Diagram
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