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5.3.4
Checking for efficiency
THE DOOR DOES NOT OPEN AT THE END OF THE CYCLE:
Operate the washing machine so that the door delay device is powered for about 30 seconds.
-
-
Switch off the appliance. The door should be released within about 2 minutes. If not, the door
interlock is faulty.
THE APPLIANCE DOES NOT START AND/OR THE PORTHOLE DOOR IS NOT LOCKED:
-
Operate the appliance for about 5 minutes.
Switch off for 2 minutes.
-
-
Switch the appliance on again. The appliance should start within no more than 5 seconds, and the
door should be locked. If not, check that the device is correctly powered (wiring - main switch -
timer), and replace if necessary.
5.4
Instantaneous door safety interlock
5.4.1
General characteristics
Certain models with electronic control systems feature an
instantaneous door safety interlock. In this case, the door can be
opened as soon as the drum comes to a stop.
5.4.2
Operating principle
1. Solenoid protective PTC
2. Solenoid valve
3. Lever mechanism
4. Camme
5. Bi-metal PTC
6. Electrical contacts (main switch)
7. Locking latch
•
When the appliance is switched on by pressing the ON/OFF button, the bi-metal PTC is powered; the
camme is in a position that prevents the locking latch from moving outwards.
•
When the programme is started by pressing START/PAUSE, the main PCB sends a signal (duration 20
msec) to the solenoid (at least 6 seconds after switching on), which causes the camme to rotate one
position. The latch which locks the lever of the door safety interlock is raised and, at the same time, the
contacts of the main switch are closed, thus powering all the electrical components.
•
At the end of the programme, the PCB sends two signals (at an interval of 200 msec) (duration 20
msec):
-
the first signal moves the camme by another position, though the latch is not released.
-
the second signal (which is sent only if the system functions correctly) moves the camme by a
further position, which causes the latch to retract, thus releasing the device; at the same time, the
contacts of the main switch are opened.
SOI/DT 2006-01 dmm
36/71
599 37 47-13
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