Supply; Supply From Knx Bus - Siemens Synco RMZ792 Series Basic Documentation

Note
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Siemens
Building Technologies
4

Supply

The bus operator unit can be supplied in three different ways:
• Supply from KNX bus (power consumption 45 mA).
• External supply (from external AC 24 V supply).
• Supply from Synco 700 control unit (from service interface
of the Synco device; use only in exceptional cases).
4.1

Supply from KNX bus

If the bus operator unit is used at a place where there is no external AC 24 V supply
(e.g. mobile use), the bus operator unit can be supplied via the KNX bus.
• The slider on the rear of the bus operator unit must be set to "KNX".
• For the bus operator unit, calculate 45 mA supplied by the KNX bus. To this end,
at least 2 Synco control units with decentralized bus supply must be activated,
or a central power supply is required (see also document P3127).
• The bus operator unit is connected using the delivered cable to
- a KNX bus plug (figure a) or
- a Synco 700 control unit (figure b), or
• The KNX bus lines (terminals CE+ and CE–) are wired in the floor of the housing
(figure c, watch out for polarity).
a)
G CE+ CE
S
KNX
KNX
G0
S1
X1
45 mA
KNX TP1
KNX KNX bus
N1 Synco 700 control unit
S1 RMZ792 bus operator unit
X1
Bus connection plug
When using the supplied cable, make sure you insert the RJ45 plug until you hear it
snap into place in the respective plugs.
Bus operator unit RMZ792 Series B
4 Supply
b)
G CE+ CE
S
KNX
KNX
G0
S1
Synco RM... N1
45 mA
KNX TP1
c)
45 mA
KNX
CE+ CE
G
S
KNX
KNX
G0
S1
CE1P3113en
07.07.2011