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Secure operation
Note!
Power consumption
PXC3
24 / 56
Siemens
Building Technologies
• The next device has no AC 24 V power when a room automation station is
removed. The connection exists only on the board, but not on the terminal block.
• The Ethernet switch is inactive when a room automation station has no AC 24 V
power. The next devices, if in line topology, are disconnected from the network.
For secure operation of the system it is recommended to supply each
room automation station separately with AC 24 V.
7.3
Transformer sizing
The AC 24 V is wired in star distribution for one PXC3... room automation station.
The AC24V may be looped via terminals 7 and 8 as well for multiple PXC3... .
However, 10 A must never be exceeded at AC input terminals 5 and 6.
Possible wiring lengths are half as long at the same power when wired for star
distribution.
The permissible voltage drop of 0.6 V on the power wire between the transformer
and the most distant power point (room automation station, power module, bus
interface module) is the basis for calculations.
The engineering office is responsible for sizing transformer output.
Max. permissible input current AC 24 V
(through terminals 5 and 6)
Base load (without loading by modules and field
devices)
Island bus supply
DC 24 V / max. 600 mA
PL-Link supply
DC 29 V / max. 160 mA *)
*) The bus supply can be switched off manually via ABT if not used.
Factory setting: "Auto detection"
DALI supply
DC 16 V / max. 128 mA
Transit power AC 24 V
TX-IO: AC 24V / 6 A (island bus)
PL-Link: AC 24V / 2 A(terminals 3 and 4)
AC 24 V / 6 A
(terminals 7 and 8, for additional AV 24 V
consumers)
Mounting and installation
Wiring for AC 24 V and island bus
Total max. 10 A
(Ext. fusing compulsory)
8 VA / 0.33 A
30 VA / 1.25 A
12 VA / 0.50 A
9 VA / 0.37 A
144 VA / 6 A
48 VA / 2 A
144 VA / 6 A
(only if the sum of 10 A at
terminals 5 and 6 is not
exceeded)
CM111043en_03
2013-02-23
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