Power Supply For Field Devices - Siemens Desigo TRA Engineering, Mounting And Installation Manual

Type
Data sheet
AC 24 V
Fusing
DC 24 V
Fusing
KNX field supply
(terminals 3 and 4)
Fusing
Note!
Caution!
Note!
Powering field devices
with external transformer
N1
N1
N1
32 / 84
Siemens
Building Technologies
6.4

Power supply for field devices

Most of the TRA devices have a built-in power supply for field devices
TXM1.8U DXR2.x09
AC 230 V
N8173 N9204
N9206
5)
48 VA 4 VA
4) 1)
10 A
1)
Short circuit proof.
2)
Sum of all triacs plus field supply
3)
Air quality sensors (QPA.., AQR..) and condensation monitor (QXA..):
These devices require an external / local transformer.
Reason: Although the documented continuous load is only 0.5 VA, high peak
currents occur at switch on and during measurement operations.
4)
T 10 A fuse in the PXC3 / in the power supply module / in the bus connection
module.
Use cable cross section suited for 10 A according to local regulations!
5)
TXM1.8U: Bus connection module may feed any supply voltage.
Field devices may be powered using an external / local transformer.
The external transformer must NOT be grounded (earth loops).
The external power supply must NOT be used to supply the triacs.
V V
Y10
Y10 V
V
Y10
Y4
V
Desigo TRA Engineering, mounting and installation
Wiring of power lines
DXR2... DXR2.x18
AC 24 V
N9205 N9205
N9207 N9207
2) 3)
12 VA 18 VA
1)
2.4 W
Y1
Y2
AC 24 V AC 230 V
Y3
AC 230 V
AC 24 V
PXC3
N9203
48 VA
1) 4)
10 A
1)
48 VA
1)
Room automation station
N1
General device with input
Y1
DC 0...10 V, supplied by room
automation station
General device with input
Y2
DC 0...10 V, supplied externally
External supply must NOT be
earthed (earth loop)
General device with input
Y3
DC 0...10 V, supplied externally
External supply must NOT be
used to supply the triacs
RXM39.1
N3836
6 VA
1)
CM111043en_09
2016-02-22