MAN205-0195042EN Rev. A Aug. 2011
Page 31 of 137 pages
3.7 The Control System
The Main Board
Controls and monitors the physical parameters of the process and performs the
operation sequence of the machine, according to the selected program.
The main board contains the following elements:
16 digital inputs
24 digital outputs
6 PT 100 inputs
7 inputs of 4–20mA
Voltage inputs for the electrodes for water level
2 analog outputs of 4–20mA
Serial ports
CPUs.
2 ADCs for reading temperature and pressure sensors.
Each ADC maintains at least 3 temperature sensors (PT100), and 3 pressure sensors
(4–20mA).
All connections to the main board are via rigid connectors for quick and efficient
dismantling.
Digital Inputs
The digital inputs are 0/1:
Open/close for door positions
Safety cut-off switches
Pressure cut-off switches
Switches for water level
The input voltage is 24VDC. The input is protected from high voltages by means of an
Opto-coupler.
Digital Outputs
Digital outputs are used to activate solenoid valves, relays and SSR for the pumps and
heating elements.
Each output is up to 2A, however all the outputs together will not have a capacity higher
than 110 W.
The command voltage is 24 VDC, but it can vary in the range of 10–30VDC.
To Next Page