TECHNICAL MANUAL
CVM 3000
C 5030 CV/04-99 GB
3
Board description
The system consists of a main board and keyboard. An expansion board (slave) may also
be present, depending on the type of unit. The keyboard may be one of two types:
•
Keyboard for units with 1 to 4 compressors;
•
Keyboard for units with over 4 compressors.
The main board communicates with the keyboard through a serial current-loop and with
the expansion board through a RS485 serial port.
A board (logic board) with the microprocessor used to control all the electronic system is
mounted on the main board. The electronic system management program is memorised in
the EPROM. Parameters, adjustments and history data of the various unit models
managed by this controller are memorised in the EEPROM. The parameters are set
through the keyboard.
Figure 1-0 ELECTRONIC SYSTEM
MAIN
BOARD