Electrolux 7 Series Service Manual page 57

11.9 Door safety interlock
11.9.1 General characteristics
The instantaneous door interlock allows the door to be opened as soon as the drum stops.
If the conditions described further are met.
In appliances with a drum light, a door safety interlock is fitted with an integrated switch (piloted via a slide from
the door latch). The information about the position of the switch is sent to the main circuit board and
consequently powers the LED or not.
1 Main circuit board
2 Door safety interlock (with light micro-switch)
2a Door safety interlock (without light micro-switch)
11.9.2 Operating principle
1. Solenoid protection PTC
2. Solenoid
3. Lifting assembly
4. Cam
5. PTC - bi-metal
6. Electrical contacts (main switch)
7. Ratchet
•
When the programme starts (start/pause button), the main circuit board sends a voltage pulse, lasting
20 msec, to the solenoid (at least 6 seconds must have passed since the appliance was turned on), which
turns the position of the cam: the ratchet which locks the cursor of the door safety interlock is raised and
simultaneously closes the contacts of the main switch, which powers all the appliance components.
•
When the programme ends, the circuit board sends two additional 20 msec pulses (200 msec apart):
- the first pulse moves the cam by another position, without releasing the ratchet
- the second pulse (which is only sent if everything is in working order) moves the cam to another
position, which causes the ratchet to return to its position and therefore release the interlock; the
contacts of the main switch are simultaneously opened.
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