Power Supply; Power Supply Via Konnex Bus; External Power Supply - Siemens Synco RMZ792 Basic Documentation

Notes
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Building Technologies
HVAC Products
4

Power supply

The bus operator unit can be powered in 3 different ways:
• Via Konnex bus (45 mA)
• Via an external power source (AC 24 V)
• Via the service interface of a Synco™ controller (not recommended)
• When using the cable supplied with the bus operator unit, plug correctly the RJ45
connector into the appropriate socket of the RMZ792 (audible click)
• Move the KNX / EXT slide switch for selecting the type of power supply to its end
position
4.1

Power supply via Konnex bus

• If the bus operator unit is used in a location where AC 24 V power supply is not
available (mobile use, installation in some other space), the unit can be powered via
the Konnex bus
• Power supply must be such that 45 mA are available for the bus operator unit. This
necessitates at least 2 active decentral bus power supplies via Synco™ controllers
or 1 central bus power supply
• The slide switch at the rear of the bus operator unit must be set to KNX
• Using the cable supplied with the unit, the RMZ792 is to be connected to a Konnex
bus socket (figure a) or a Synco™ controller (figure b)
• The Konnex bus cable is to be connected to terminals CE+ and CE– on the base
(figure c; observe polarity)
a)
CE
G CE+
S
KNX
KNX
G0
S1
X1
45 mA
KNX TP1
KNX Konnex bus
N1 Synco™ 700 controller
S1 Bus operator unit RMZ792
X1 Bus socket
4.2

External power supply

• External AC 24 V power supply is recommended in the case of fixed installations
(e.g. in the control panel door). This means that the decentral / central bus power
supply does not have to carry the load of the bus operator unit and can be used for
powering other bus users
• The slide switch at the rear of the bus operator unit must be set to EXT
• AC 24 V is supplied to the bus operator unit via terminals G and G0
SP
KNX
G CE+ CE
S
EXT
KNX
G0
SN
Bus operator unit RMZ792
4 Power supply
b)
CE
G CE+
S
KNX
KNX
G0
S1
Synco RM...
N1
45 mA
KNX TP1
c)
45 mA
KNX
CE
G CE+
S
KNX
KNX
G0
S1
CE1P3113en
03.04.2006