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Siemens Desigo Room automation - Engineering, mounting and installation CM111043en_13
Smart Infrastrructure Wiring of power lines 2020-04-30
6.3 AC 24 V power lines
6.3.1 PXC3 (power and island bus lines)
The following diagram illustrates basic wiring for power lines for modular room
automation stations using AC 24 V operating voltage as per PELV (Grounding of ^
near the transformer). SELV without grounding is also admitted.
Installation box 1 ß à Installation box 2
AC 230 V
AC 24 V
N
T1
F1
...A
L
11043z10
F4
X1
F5
24V~ 24V~ 24V~ 24V~
U1
24V~
K
F3
N1 X1
F4
N2
AC 230 V
AC 24 V
N
T2
F2
...A
L
24V~
AC 24 V
Island bus
T, T2 Safety transformer AC 230 V / AC 24 V as per EN 61 558.
K Terminal block for star distribution of AC 24 V and ^.
N1 PXC3 room automation station.
N2 PXC3 room automation station, with separate power AC 24 V
(looped power from T1 admitted but not recommended).
U1 Power supply module TXS1.12F10
X1 Bus connection module TXS1.EF10
F1, F2 Low-voltage fuse, for max. power with AC 24 V. Max. T 10 A
F3 T 10 A fuse in the PXC3
F4 T 10 A fuse in power supply module.
F5 T 10 A fuse in the bus connection module.
Installation example
Key