21. Control unit
21
5
438 9145-21/03
02.38
Service
Manual
• I/O cards A11 and A12
Most smaller machines have only one card:
A11. The I/O cards are controlled by the CPU
card via a serial interface. The I/O cards
feature outputs, which, via the communication
card in the rear control unit, control various
machine functions, such as the water valves,
heating connection and drain valve. The cards
also have inputs for emergency stop and door
lock.
The programme unit is described in detail in
section 23. Programme unit.
Level guard B2
Control of the water level and turning of the drum
are controlled with a backup guard, to ensure
that the door will not open with water in the drum
or when the drum rotates.
Apart from the level guard on the CPU card,
there is a level guard B2, connected to the door
lock control A31. This card controls door locking
action as well as the level and drum rpm speed.
Transformer T10
The low voltage transformer supplying power to
the various cards operates on DC power.
Using the short-circuit connectors on the PCB,
the transformer can be switched to one of four
different voltage supplies.
4
5
+
-
X172
208 V
Supply voltage
X178
Short-
circuit
connector
5227
Transformer T 10
230 V
240 V
480 V
1,25 A
Level guard B2
5231
Transformer T 10
X278
Fig.
4
Fig.
5
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