12. Function Sequences Service
Manual
12 Type Edition Page
Safety Lock
The machine can not be started until the door is closed (point ( B ) in the
diagram does not receive voltage until the door is closed, see sequence
diagram "Power supply and start"). When the start button on the machine is
pressed, or the correct number of coins are inserted into the coin meter, the
timer advances to stage 1. Row 9b (1) then closes and the solenoid which
locks the door (4) receives voltage.
When the lock piston has locked the door, S4 (7) closes and point C
receives voltage. It is only then that the drum can begin to revolve and
water begin to fill.
At program stage 1, row 11b (3) closes up which means that the bimetal
spring in the delay unit heats up. Once the spring is heated, the delay unit
holds the door locked.
Row 11b is closed during the entire wash program. In the case of a power
failure, it takes > 2 minutes for the bi-metal spring has cooled down and the
door to open. This is a security measure that guarantees the drum has
ample time to stop and that water can drain (the drain valve opens
automatically in the event of a power failure).
During the last phase of the tumble cycle (program stage 49-50) row 11b
(3) opens. When the program is completed (program stage 50), row 15b (2)
closes and the solenoid which opens the lock (5) withdraws the lock piston
so that the door can be opened immediately. This program stage lasts 2
minutes. In this time plus the time in stage 49 the bi-metal spring in the
door lock have time to cool down so that the door does not lock when row
15b opens in stage 51.
13 9010 6
Sequence diagram
1577
9b. Door solenoid close
11b. Door lock
15b. Door solenoid open