Operating instructions

33
Mechanical and electrical design
NOTE
Do not repair a faulty door lock.
Allways replace the old unit
with a new one, to assure prop-
er operation of the door safety
interlock.
0936
Description
The door locking mechanism is a safety system
that prevents injury by:
• Preventing the machine from starting before
the door has been closed and the handle
secured.
• Locking the door automatically when the
machine starts.
• Preventing the door from being opened before
the program has been concluded and the
drum is stationary. This ensures that the drum
is stationary when the door is opened and that
there is no water in the machine.
Brief description of the locking action
1. Door is closed Microswitch S3 is
operated by the door
and closes.
2. START The program TImer
button energises the PTC
pressed resistor in the locking
mechanism. This causes the
bimetal strip in the mecha-
nism to heat up and toggle
over to lock the catch. It also
operates an electrical
contact, connecting the N
line to the connectors and
valves in the machine.
3. Program runs
4. Program is The supply to the PTC
finished resistor is disconnected,
allowing the bimetal to cool.
When it has cooled, it
toggles back and releases
the catch, while the electrical
contact interrupts the com-
mon (N) connection to the
connectors and valves.
50
Timer
Other
functions
Door lock
N
L1
Fig.
50