SOI/DT 2010-03 dmm 47/78 599 72 84-41
11.2 Door safety interlock
There are two types of door interlock:
• volumetric with PTC
• instantaneous
11.2.1 Volumetric interlock with PTC
10 Anti-disturbance filter
19 Door safety interlock
20 PCB
ON/OFF = Main switch (incorporated in the
programme selector)
11.2.1.1 Operating principle
ª When the washing programme is started by pressing the start/pause button, the bi-metal PTC (contacts 3-5)
is powered by the triac (Door_TY) on the PCB: after 2-4 seconds, this closes the switch (5-4) which powers
the electrical components of the appliance(only if the door is closed).
ª The door interlock prevents the door from being opened while the appliance is in operation.
ª At the end of the washing programme, the PCB disconnects the interlock from the power supply, but the
door remains locked for a further 1 to 3 minutes (PTC cooling time).
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