29
Mechanical and electrical design
4697
Fig.
29
X96 X95 X94 X93 X99 X98 X97
X90
X91
X92
Door lock control unit
Red LED,
an indicator
Relay RE3
29
Door lock control unit
The sole function of this control unit is to oversee the correct functioning of
the door lock. The CPU board receives information from the motor control
unit about motor rotation, and has its own level-monitoring device. The
control unit also detects water level and motor speed through separate
level measurement devices and the rotation guard (speed-monitoring
device). Through this double monitoring, a very high level of safety can be
achieved.
When the CPU board commands door locking, the control unit checks that
there is no water in the drum and that the drum is not rotating. Only after
that is a signal sent to the door lock. Level and rotation are checked in the
same way before the door is allowed to open.
For even greater safety, the voltage feed to the I/O boards’ outputs goes
via both the emergency stop and the door lock switch. This means that no
functions can proceed unless the emergency stop is in its normal position
(not actuated) and the door is locked.
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