SOI/TD - PR
20
599 36 01-86
6.7 Level stability during washing
Once the fill phase has been completed, the cycle proceeds to the washing phase. The washing phase is
carried out using cold or heated water, and the status of the pressure switch is monitored constantly to
ensure that the hydraulic system functions correctly. Water replenishment cycles may be performed if
necessary.
If the pressure switch returns to EMPTY during the washing phase, the fill solenoid is energized for a
maximum time equivalent to
T.S. x 3
(maximum allowable total fill time).
If this time is exceeded, the washing cycle is completed, but no further supplementary fills are performed. In
this situation, alarm condition [
F 0
] is stored in memory. This alarm code is not displayed to the user, but can
be accessed by the Service Engineer using a specific procedure.
6.8 Washing system
The appliance features the classic washing system in which the
mechanical washing action is obtained by the rotation of the washing
pump which, by ducting water into the hydraulic circuit, actions the
two spray arms simultaneously.
The washing pump is actioned by an asynchronous motor with a
start-up capacitor (3µF - 450VL).
The washing pump rotates in a counter-clockwise direction (seen
from the impeller side) and is fitted with a tachymetric generator.
In order to optimize the washing programmes, two washing systems
can be applied:
“
ctrl
“
Washing at constant speed (2800 rpm) (maximum speed of the motor).
“
pw
“
Pulse washing at 1600 - 2800 rpm. This washing system is controlled by the electronic
control system, which actions the washing pump alternately at two speeds (minimum and
maximum speed) for short periods.
MOTOR SPEED
PERIOD OF OPERATION
Maintenance
1600 rpm
4 sec
PW1 Pulses
2800 rpm
0.8 sec
The
ctrl
and
pw
speeds are configurable. For further details, refer to the cycles tables relative to the specific
model.
6.8.1
Control of the washing pump
The washing pump (PL) is powered by triac
TY4 on the circuit board (connector C3), by the
door switch (IP) and by the ON/OFF switch
(PU).
The main circuit board controls the speed of
rotation according to the signal received from
the tachymetric generator (T) connected to
connectors E1-E2.
This signal is used for:
Control of the washing system (
ctrl
or
pw
)
Control of the pump motor safety devices
and the relative alarms
Control of the dynamic fill
