COFFEtek NEVA 4, Technical Manual

Page: 10 / 40

COFFE tek LTD
NEVA 4 Issue 1 22/02/08 10
ELECTRICAL AND ELECTRONIC SYSTEM
Functional Description
21. The MPU Controller Board employs microprocessor technology to monitor and control
the operation of the beverage machine. The board contains the main System Program,
the Operator's Program and the Engineer's Program, each stored in programmable read
only memory (EPROM).
22. Variables, such as the amount of ingredients dispensed, are stored in non-volatile
random access memory (NVRAM) and are called up by addressing either the Operator's
Program or the Engineer's Program as appropriate.
23. The main System Program tasks the microprocessor with continually checking the status
of the input devices (keypad, probe, etc) and responding to data received by signaling
the output devices (LCD display, motors, whippers, etc) to take the appropriate action.
The System Program also requests the microprocessor to interrogate the variable
settings in NVRAM and to modify its actions accordingly.
24. Output transistors and F.E.T. devices on the MPU Controller Board convert signals from
the Controller’s microprocessor circuit to the current drive necessary to operate output
devices, i.e. motors, whippers and inlet valve.
MOTORS / FAN
HEATER SSR'S
VALVES
KEYPAD
DISPLAY
CONTROLLER
BOARD
WATER LEVEL
TEMP SENSOR
PUSHBUTTONS
FIG 1.3 ELECTRICAL & ELECTRONIC SYSTEM – FUNCTIONAL DIAGRAM.