Operating instructions

43
When the machine has halted, the rotation guard relay K1 is closes which
means that the door lock coil Y4 will be energised and the door can be opened.
Since the wash and extraction relays are not closed, relay K3 is not energised.
When the machine starts and pulses are received from the pulse generator
relay K1 will switch immediately and it will not be possible to open the door.
Since the machine's wash or extraction relay is energised, relay K3 closes after
a delay of approx. 2 seconds.
The rotation guard also checks that the drive belt has not broken. It works as
follows: relay K3 is closed when the machine is working. If the belt breaks, the
drum stops and the pulse generator stops transmitting pulses.
After 2 seconds relay K1 closes. When this happens the circuit between phase
(L1) and neutral (N) closes. The current increases so that main fuse F11 blows.
The machine stops and the door remains locked until the bimetallic strip in the
delay unit has cooled.
Mechanical and electrical design
Fig.
67
67
R8
R9
2,2 Ω 2,2 Ω
K3
X90:1
K1
X93:3
X75:1
S1
X82:2
X91:1
X90:2
F11
L1 N
K2
K4
Y4
B41
X96:1
X96:2
X93:2
X96:1
X96:2
+
Wash relay
Extraction relay
Door lock coil
open
Pulse generator
Rotation guard
Logic section
K2 or K4 closes: K3 operates after approx. 2 sec.
K2 or K4 opens: K3 releases immediately
Logic section
Pulses from B41: K1 and K2 release immediately
No pulses from B41: K1 and K2 operate after
approx. 2 sec..
Circuit board
2005