SUPREMATouch
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Description of the System
MSA
US
9.6 System Power Supply
The system is supplied with 24 VDC Three pairs of terminals are provided, so that the power can
be taken from 3 different sources (redundancy). The supplies are functionally equivalent, but the
power draw is prioritised as follows: 1
st
= EXT, 2
nd
= INT, 3
rd
= BAT. The changeover from one
source to another is accomplished by hardware means in the system modules.
When an external power pack or battery supply is used, the power should be filtered through an
appropriate EMC [electromagnetic compatibility] filter. The EMC and low-voltage guidelines
should be followed.
NOTE: During the operation of SUPREMA Systems with UPS or battery back-up, care should be
taken to ensure that no undefined low voltage operation (U < 19V DC) can arise or else it can have
adverse effects on the System Functions.
If, for example, a battery is connected directly to the SUPREMA and the normal 24 VDC supply
unit fails, then the battery become the power supply of the system. If the 24 VDC supply unit is not
restored promptly and no external action is taken, there is the danger of:
- deep discharge of the battery
- permanent damage and destruction of the battery.
In order to protect the battery and the SUPREMA against damage, an additional deep discharge
contactor component is required in the corresponding 24V feeder (e.g. deep discharge contactor
C1900-TLS, Mentzer or similar).
EXT Terminals (External Power Supply, 24 VDC)
INT Terminals (MSP Module, 24 VDC 150 W)
BAT Terminals (Backup Battery Power Supply)
• Connection for voltage supply from an external power supply unit; power is sent to all units
in the rack.
• Required when a redundant power supply is provided or when the internal rack power sup-
ply is not sufficient to operate all of the sensors.
• Maximum supply current of 20 A for one rack.
• Connection for voltage supply from an internal rack power supply or an external power sup-
ply unit.
• Power supplied to all rack units and the sensors.
• The internal power supply unit (MSP module) has a supply voltage input of 85 ... 265 VAC
(47 ... 63 Hz) or 120 ... 330 VDC.
• If the rack power supply unit cannot supply enough power, the sensors, modules or relays
must be supplied by external power supply units.
• The internal rack power supply can be omitted if, because of a high power requirement or
a redundant design, the power is being supplied by an external power supply via the INT
terminals.
• Maximum supply current of 20 A.
• Backup battery power supply for all units of a rack (21 ...28 VDC).
• If the internal and/or the external power supply fails, the system receives its power here.
• Maximum supply current of 20 A.
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