Electrolux EDW 1000 Service Manual page 16

5.2 WATER FILL CONTROL
The quantity of water necessary to perform the washing cycle is determined exclusively by the closure
of the contact on the pressure switch, which switches from "EMPTY" to "FULL".
In order to assure that the hydraulic circuit is correctly balanced, this system ensures that, if the
pressure switch re-opens on "EMPTY", the water is replenished until the pressure switch returns to
"FULL".
The fill phase is subdivided into the following sub-phases:
WATER FILL SUB-PHASE
Static Fill (pressure switch lev.)
Dynamic Fill (fixed duration)
Pause
Dynamic Fill (fixed duration)
Control of level stability
5.2.1 Static Fill
With the motor switched off, the fill solenoid is activated and water is introduced into the appliance
untill "FULL" signal is received. This is followed by:
5.2.2 Dynamic Fill
The motor is switched on at 1600 rpm, and water is introduced for 10 seconds (fixed time).
This condition makes it possible to start filling the hydraulic circuit. This is followed by:
5.2.3 Pause
The motor and the fill solenoid switch off for 5 seconds (fixed time) to allow the water to fill up the
sump again.
5.2.4 Dynamic Fill to level control
The motor is switched on at 1600rpm for 5 seconds (fixed time) and water fill continues only if the
pressure switch is on "EMPTY", untill it turns to "FULL".
The level is determined by the pressure chamber (inside the sump) to which the pressure switch
is linked. This is folowed by:
5.2.4 Control of level stability
When the pressure switch signal is "FULL", the fill solenoid is switched off; the motor switches on at
a constant speed of 2300 rpm.
A control procedure takes place, in which the pressure switch signal must remain closed on
"FULL" for 20 seconds without interruption.
The hydraulic circuit operates in optimum conditions when the pressure switch signal remains
stable on "FULL". In this case, the quantity of water inside the sump is sufficient to ensure that
the motor can operate without speed fluctuations caused by cavitation, which may occur when
the water in the sump is insufficient.
When the pressure switch signal has remained on "FULL" for 20 seconds without interruption,
the fill phase is considered complete; the system advances to the subsequent phase.
When this condition is reached, the appliance is said to be dynamically balanced.
If the pressure switch signal should go to "EMPTY" during the 20 second control procedure, the
motor is switched off; the fill solenoid is again activated, and water is introduced until the
pressure switch signal returns to "FULL".
This control procedure is repeated until dynamic balance is achieved.
N.B. In this case, the water level is monitored constantly by the two special safety systems
(software and hydraulic) in order to ensure that an excessive water fill does not result in water
leakage from the appliance.
TSE-P 02.01 LF
MOTOR STATUS
Stopped
1600 rpm
Stopped
1600 rpm
2300 rpm
16/35
CONDITIONS
until "FULL" signal is received
Time-out (10 seconds)
Time-out (5 seconds)
Time-out (5 seconds)
(dynamic balance maintaining)
599 34 60-32