REV 0, June 2005Page 36
Operation Manual SUPREMA
3. Description of the System
• If all three voltages (EXT, INT and BAT) are being supplied, only one of them is allowed
through to supply the module. The prioritisation of this connection is as follows: 1
st
=
EXT, 2
nd
= INT, 3
rd
= BAT. Example: If the EXT, INT and BAT voltages are all present, it is
the EXT voltage that is passed through.
• The voltages required for the individual modules are obtained in the modules themselves
from the 24 V.
• The power requirement that must be met is derived from the type and number of sensors
connected and from the components installed in the system.
• The maximum power provided for one rack is 480 W (maximum current of 20 A).
• The MDA module measures all the input voltages and can generate error messages,
which can be shown on the display unit. In addition, a POWER FAIL relay is de-
energised when the status of the system power supply changes.
3.7.5 Power Supply Plans
Three (functionally equivalent) pairs of terminals (EXT, INT, BAT) are provided on the MIB
Module card for supplying power to the system and the sensors. All of the system cards and
the sensors can be supplied from each of these connections. A voltage changeover switch is
provided on each system card, which ensures that only one of the voltages being applied is
actually accepted. Various power supply plans are available to suit the number and type of
sensors and/or the required degree of redundancy in the power supply.
If the internal rack power supply unit is not sufficient to power all the sensors, an external unit
must be provided. The internal unit must then be disconnected. A redundant power supply is
then provided by external units via the BAT or INT terminals.
Supply Plan A: Internal Power Supply Unit
All of the units of the system and the sensors are supplied by the rack power supply unit (INT
terminals). This variant is used when no power supply redundancy is required and the power
which can be supplied by the unit installed in the rack (150 W) is sufficient to supply all of the
rack modules and the connected sensors.
Supply Plan B: External Power Supply Unit
All modules of the system housed in the rack and the sensors are supplied by the external
power supply unit (EXT terminals). This variant is used when no redundancy is required in the
power supply and the power of the unit installed in the rack (150 W) is
not sufficient to supply
all of the system modules and the connected sensors. A maximum of 20 A can be supplied
across the terminals (480 W system power).
Supply Plan C: Internal Power Supply Unit + Battery
All units of the system and the sensors are supplied by the rack power supply unit (INT terminals)
or by the backup power supply (BAT terminals). This variant is used when there must be
redundancy in the power supply and the power of the unit installed in the rack (150 W) is
sufficient for all rack modules and the connected sensors.
Supply Plan D: External Power Supply Unit + Battery
All modules of the system and the sensors are supplied by the external power supply unit (EXT
terminals) or by the backup power supply (BAT terminals). This variant is used when the power
supply must be redundant and the power that can be supplied by the unit installed in the rack is
not sufficient to supply the system modules and the connected sensors. A maximum of 10 A
can be supplied across the terminals (240 W system power).
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