5
29
29. Door and door lock
438 9145-61/06
04.10
Service
Manual
The door lock unlocks the door
The programme unit requests door unlocking by
applying 0 V on input X92 of the door lock
controller.
The following check is made prior to unlocking of
the door:
• No water in drum - input X93 from level
guard B2 is closed = 0 V
• Motor not engaged - input X94 from motor
controller U1 open = 5 V
• Drum not rotating - pulse frequency on input
X95 from rotation sensor B3 less than 0.4 Hz.
When the above conditions are met, the door
lock controller outputs an opening pulse on
output 96 to the door lock actuator/coil, which
then unlocks the door. Micro switches S4a and
S4b now interrupt the actuator/door lock and the
I/O card 1 relays lose all voltage to prevent the
motor from starting (interlock signal on motor
controller input X302). The drain and water
valves of the machine are now disabled and the
heater and motor cannot be switched on.
Fig.
4
4
5225
Door lock
control A31
Level
guard
B2
M1
Door lock
A41
Programme
unit A1
X92
X4
X96
X95
X93
X5
X94
Motor
control
U1
Rotation sensor B3
X304
X302
X10
I/O card 1
A11
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