Door Safety Interlock; Volumetric Interlock With Ptc; Operating Principle - Electrolux TC2 Service Manual

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

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).
The door interlock prevents the door from being opened while the appliance is in operation.
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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