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21.8 Inverter
21.8.1 General characteristics
The EWX14931 electronics use a new asynchronous motor, with 2 poles, three-phase, with high performance
and low noise levels.
"INVERTER" operating diagram
The motors powered by this inverter do not have tachometric winding.
The inverter can detect/adjust the motor speed via the current absorption.
During the spin phases, the microprocessor can perform, depending on the software configuration, the anti-
foam check, where featured, and the anti-unbalancing check.
Any work on electrical appliances must only be carried out by qualified
personnel.
Unplug the appliance before accessing internal components.
When replacing the "INVERTER" board, do not open the plastic casing, because
some parts are subject to high voltage values and some condensers remain
loaded for a long time at dangerous voltage levels even after being unplugged.
Accidental physical contact may cause electric shocks.
In the event of a fault an alarm will be displayed - see table of alarms.
21.8.2 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 - DMM
To transform the single-phase electricity (available in our homes) into three-
phase electricity, a new circuit board is used (A) to transform the energy from
single-phase to three-phase, which can be modulated in breadth and
frequency respectively to adjust the power and number of revolutions of the
motor.
Single-phase electricity (applied to connectors L-N), is rectified by the diode
jumper (D), so there is a direct voltage of 310 V at the ends of condenser C,
which through the combination of the opening and closing of switches I1÷I6
(piloted by the µprocessor) determines the piloting voltage and frequency of
the motor.
Clockwise rotation of the motor
90/124
L
= Phase
N
= Neutral
A
= "INVERTER" board
B
= Motor
C
= Condenser
D
= Diodes
I1÷6 = Switches
F1÷3 = Motor connectors
µP
= Micro Processor
Anti-clockwise rotation of the motor
599 75 58-67 Rev. 04
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