62
Electronic program control unit
Description
The program control unit is electronic and consists of a circuit board with
components. On one half are the microprocessor, program memory
(EPROM), power supply circuits, temperature and level control devices and
so on. On the other half are the relays and interference suppression
components. The program control unit has the following inputs and outputs:
•
Inputs reacting to push-buttons on the control panel.
•
Inputs which provide information on the machine’s door lock status, level
control, temperature sensors and coin mechanism if installed.
•
Outputs which via relays directly control the various functions of the
machine, e.g. motor control, water valves and door lock.
•
Outputs to the display.
•
Serial communication with the motor control unit.
The program control unit is controlled by the microprocessor, which fetches
its instructions from the program memory (EPROM). The EPROM contains
instructions for operation, the service program, control of relays, sensing of
inputs etc. The EPROM also contains the standard programs supplied with
the machine.
Fig.
76
X74
Temperature
sensor
X75
Motor control
unit
X76
Price=zero
X80
Valves
X81
Valves
X82
Valves
X83
Heating
X84
CP80
X71
Door lock
X72
Voltage feed
F1 (1A/250V)
For electronics
Buzzer
Microprocessor
Relays
Program memory (EPROM)
Level sensing
device
Service switch
2316
X79
Drain
X78
Input voltage
Interference
suppression
components
To
control
panel
X77
Coin mechanism
F2, F3 (1A/250V)
For display
76
Mechanical and electrical design
Содержание EXSM 230 S
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