152
4
Door and door lock
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 gu
-
ard 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 negative pulse on
output 96 to the door lock actuator, which then
unlocks the door. Micro switches S4a and S4b
now interrupt the actuator and the I/O card 1
relays lose all voltage to prevent the motor from
starting (no 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.
5225
4
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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