REV 0, June 2005 Page 37
Operation Manual SUPREMA
3. Description of the System
Voltage Change-Over
Each module has a switch, which allows one of the available voltages (EXT, INT, BAT) through
to the module. The electronic components of the card and possibly the sensors connected to it
are supplied with this voltage.
Function:
• If all the voltages are present, EXT is passed through.
• If EXT fails, INT is connected.
• If INT fails, BAT is connected.
The voltage change over is delay free.
Power Supply Type Voltages Present Voltage Passed Through
A INT INT
BEXT EXT
CINTINT
BAT
DEXT EXT
BAT
EBAT
BAT
F E XT INT E XT
G E XT INT E XT
BAT
Table 3-1: Voltage Changeover
Overload Control
If the 24 V power supply collapses because of excessive demand from the connected sensors,
the power supply to the heads is cut off. The switching threshold for the shutoff of the sensor
supply is approximately 19.2 V. The system modules (MCP module, MDA module, MDO module)
can work on an operating voltage as low as approximately 12 V.
The supply to the sensors is turned on in a staggered manner based on slot locations. As a
result, the power supply during the power-on phase is not overloaded as a result of the relatively
large initial current taken by the sensors.
To Next Page
Loading...
