Design and function
2017-05-22 / DIS 113_58300000186503_ara_en_c
Copyright by BSH Hausgeräte GmbH
Page 27 of 85
3.17
Door lock (electromagnetic)
3.17.1
Structure
Fig. 23:
Components of the door lock
1
Pressure spring of the lock bolt
7
Guiding rod
2
Lock bolt
8
Armature
3
Locking hook
9
Coil
4
Limit stop
10 Pressure spring of the coil
5
Switching contacts
11 Emergency unlock
6
Switching block
The electromagnetic door lock consists of a locking hook (3) and a movable bar
(2) in which a stop (4) is integrated. The switching block (6) is connected to the
armature (8) of the coil (9). A guiding rod (7) grips the guide groove of the switching
block. Shaped elements of the lock bolt and switching block press against the
spring-loaded switching contacts (5).
Pressure springs (1, 10) stabilise the position of the lock bolt and armature.
The door can be manually unlocked via the emergency unlock mechanism (11).
3.17.2
Function
The electronics detect the 3 states of the door via the switching contacts of the
door lock:
•
Door open
•
Door closed and not locked
•
Door closed and locked
When the
door is open
, the lock bolt and switching block are in the home position.
The guiding rod holds the switching block in position via the guide groove.
When the
door is closed
, the locking hook moves the lock bolt and hooks into the
housing of the door lock. The movement of the lock bolt closes the 1st switching
contact. The electronics detect the closed state of the door.
The door is locked when:
•
The drum rotates for longer than 2 s at over 60 rpm.
•
The liquor temperature is over 60 °C.
•
The water level is above the level of the door lock.
Fig. 24:
Function of the door lock: locking
To
lock
the door, voltage is applied briefly to the coil. The magnetic field pulls the
armature into the coil. The armature simultaneously moves the switching block.
When the coil is de-energised again, the compression spring moves the armature
out of the coil. The switching block and guiding rod move into the locking position.
The lock bolt stop is fixed and the 2nd switching contact closed.
