Control Of Water Fill Phase; Static Fill; Dynamic Fill; Level Stability Control - Electrolux Diva Service Manual

6.5 Control of water fill phase

The quantity of water necessary to carry out the washing cycle is determined exclusively by the closure of
the electrical contact of the pressure switch, which changes from EMPTY to FULL. This system ensures
that, if the pressure switch re-opens on EMPTY, further water is introduced until it returns to FULL.
The water fill phase consists of the following sub-phases:
6.5.1

Static fill

With the motor switched off, the fill solenoid valve is energized and water is introduced into the appliance
until the pressure switch signal switches to FULL.
6.5.2

Dynamic fill

The dynamic fill is obtained by switching on the washing pump whose rotation causes the pressure switch to
switch to EMPTY. Subsequently, the fill solenoid valve is energized and water is introduced until the switch
returns to FULL.
The speed of rotation of the motor determines the quantity of water introduced, since the electronic control
system switches on the washing pump at a variable speed which depends on the washing system that will
be performed in the phases subsequent to the water fill:
In the case of "ctrl" washing (at constant speed), the speed of rotation increases gradually to 2800 rpm
In the case of "pw" (pulse) washing, the speed of rotation increases gradually to 1900 rpm
N.B.- Refer to the Table of Programmes for the definition of the washing system.
6.5.3

Level stability control

The hydraulic circuit operates with maximum efficiency when the pressure switch signal remains stable on
FULL. In practise, the quantity of water circulating in the sump allows the motor to run without speed
fluctuations caused by cavitation.
When the pressure switch signals FULL, the fill solenoid valve switches off.

6.6 Water fill time

The aperture of the solenoid valve has a pre-set overall duration, which is subdivided into the various sub-
phases of the fill:
6.6.1

Static fill time

T.S. = max 90 seconds: This is the maximum time within which the pressure switch must switch to FULL. If
the FULL signal is not received from the pressure switch within this time, the electronic control system
interrupts the washing cycle and the appliance enters alarm condition [1 0].
6.6.2

Dynamic fill time

T.D. = T.S. x 3: This is the maximum time allowed for the entire fill phase within which the pressure switch
signal must stabilize on FULL.
•
If the pressure switch signal does not stabilize on FULL within this period (T.S. x 3), the electronic
control system switches off the fill solenoid (and the heating element, if switched on), and then allows
the washing cycle to proceed until it is completed. In this situation, the alarm condition [F 0] is not
displayed to the user, but may be accessed by the Service Engineer using a specific procedure.
•
If, during a 2800 rpm dynamic fill, the pressure switch never closes on FULL during the initial 60
seconds, the electronic control system interrupts the washing cycle and the appliance enters alarm
condition [1 0].
6.6.3

Power supply interruption during water fill

If the water fill phase is interrupted by opening the door or due to a power failure, the contents of the
counters are stored in memory; when the door is re-closed or when the power supply is restored, the water
fill resumes from the point at which it was interrupted; the new counter values are added to those previously
memorized.
SOI/TD PR 17 /35 599 35 90-23