Technical Support - MDM 55/97 599 76 11-68 Rev. 01
11.7 Door safety interlock - traditional
11.7.1 General characteristics
An electromechanical device is used as the door safety interlock, having the following functions:
When powered, the volt metric device closes the main switch which powers certain electrical components
of the washing machine (only if the door is closed).
During operation, the cursor remains mechanically blocked, preventing the door from opening when the
appliance is running. Once the power supply is cut off, the door remains locked for 1-2 minutes to ensure
that the drum has stopped before opening it.
The door safety interlock, in the applications analysed to this point, was positioned after the anti-disturbance
filter. Consequently, it powered all the electrical components of the appliance; in this platform, it only powers
the solenoid valves and the motor.
Operating principle
Once the wash programme is started by pressing the start/pause button, the bi-metal PTC (contact 3) is
powered by the triac on the circuit board (J3-1) (J5-3): after 2÷4 seconds, the switch (4-5) powering the
electrical components of the washing machine is closed.
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