Electrolux EWM2000evo Service Manual download pdf (Page 45)

SOI/DT 2005-01 dmm 599 36 82-59

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9.15 Motor

1. PCB

2. Motor

3. Anti-boiling pressure switch AE1

4. Anti-boiling pressure switch AE2

M = rotor

P = motor safety cut-out

S = stator

T = tachometric generator

9.16 Power supply to motor

The PCB powers the motor via a triac. The direction of rotation is reversed by switching of the contacts on

the two relays (K2-K3), which modify the connection between the rotor and the stator.

In certain models (1200-1600rpm), a third relay (K4) is used to power the stator (full or half field) according

to the spin speed

The speed of rotation of the motor is determined by the signal received from the tachometric generator.

During the spin phases, the microprocessor, depending on the software configuration, may perform the anti-

foam control procedure (if featured) and the anti-unbalancing control procedure.

9.17 Anti-foam control system

The anti-foam control procedure (if featured) is performed via the anti-boiling pressure switch (AB).

Spin phase without foam Spin phase with little foam

• Spin with little foam: if the contact of pressure switch AB closes on FULL, the spin phase is

interrupted; the drain pump continues to operate and, when the contact returns to EMPTY, the spin

phase is resumed.

• Spin with excessive foam in the tub (critical situation): The control system detects whether the

pressure switch commutates 5 times to FULL. In this case, the spin phase is skipped, and a one-minute

drain cycle is performed with the motor switched off; in the case of a washing phase, a supplementary

rinse is added.

FUCS

300 rpm pulses

Spin

nti-foam

( Level AB )

300 rpm

pulses

FUCS

Spin

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Electrolux EWM2000evo Service Manual Page 45