Door Interlock; Voltmetric Interlock With Ptc; Operating Principle - Electrolux EWM3500 Service Manual

9.2

Door interlock

There are two types of door interlock:
•
voltmetric with PTC
•
instantaneous
9.2.1

Voltmetric interlock with PTC

10 Suppressor
19 Door interlock
20 PCB
ON/OFF = Main switch (programme
selector)
9.2.1.1

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 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 aperture of the door 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 1 to 3 minutes (PTC cooling time).
SOI/DT 2007-02 dmm
48/66
599 38 61-92