5
23
23. Programme unit
438 9149-81/06
04.03
Service
Manual
Function
Voltage supply
Machines with electric heating receive three-
phase voltage, while those without electric
heating receive single-phase power supply. The
voltage to the heating elements, used to heat
the water, is controlled by the programme unit
via the K21 terminal.
Single-phase voltage is fed to the motor
controller U1. Single-phase voltage, protected
by a 1.25 A fuse, is fed to the door lock
controller A21 and the programme unit A1. The
voltage to the programme unit is noise
protected by the LC filter Z1.
The transformer T10 supplies low voltage to the
programme unit.
Motor control
The programme unit controls the motor rpm,
acceleration and retardation with a high degree
of precisions via a serial interface that
communicates with the motor controller.
The motor control also receives and interlock
signal that informs when the door is closed and
locked. If the programme unit tries to start the
motor without the necessary interlock signal
present, the motor remains stopped and an
error message is sent from the motor control to
the programme unit.
The motor control also sends information to the
programme unit, such as instantaneous values,
rpm and error conditions.
The motor control is described in detail in
section 30. Motor and motor control.
Fig.
4
Fig.
5
4
5
Rotation
controller card
A31
Motor
control
U1
Heating
elements
Voltage
supply
K21
Programme unit
A1
Transformer
T10
Z1
Motor control
U1
Voltage
supply,
single-
phase
M1
Programme unit
A1
Serial comms
Interlock
1,25 A
5188
5189
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