Panasonic NA-127VB6WAE, Service Manual

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32
11.7. Door Lock
Door lock is activated at the beginning of the program in order
to prevent the door from opening. Locking is generated by
supplying power to PTC-bimetal, after max 6sec (220V), the
bimetal will be warm and ready to close the contacts. Thus
the first impulse to the solenoid will allow the contact to close
and consequently the slider will be locked by the pin of the
slider lock. The second impulse causes no electrical and
mechanical modifications. It can be unlocked by the third
impulse; the contact is opened even if the PTC-bimetal
remains energized.
Emergency Opening System (PTC-Bimetal) In Case of Lack
of Electric Energy
• In case of lack of electric energy during a washing cycle, the
PTC-bimetal assembly will cool down and after minimum 60
sec (considering previous power supply of 30 sec min and
T=20
°C) the door will be unlocked and thus can be opened.
• In case the door is closed when current comes back, the
PTC-bimetal assembly will heat again, the slider lock will lock,
the contact will close and the program will continue from
where it stopped.
Door lock
Technical features
Nominal voltage 250 V
Testing component
Check the resistance value on the component with multi-meter as shown in below figures. Resistance value on the (PTC overload
+ solenoid) should be 240Ω ±20% at 25 °C. That resistance value can be measured from terminal 3-4 (refer to section12 Wiring
Connection Diagram).
You can determine the ohm value of PTC by measuring from cables those are shown in the figure below as 3 and 4. (Referring X3
on the wiring diagram).
Component test
2
3
4
5
3
4