Wiring For Relay Outputs; Connecting The Differential Pressure Sensor - Siemens Desigo TRA Engineering, Mounting And Installation Manual

Cable length
AC 230 V
Cable length AC 24 V
Note
Cable cross sectio
40 / 84
Siemens
Building Technologies
7.3

Wiring for Relay outputs

External fuse of max. T 10 A for protection of the PCB tracks.
The maximum load of the relay contracts must be observed (see data sheets for
the corresponding devices). It may require a fusing <10 A.
Relays have volt-free relay contacts.
The mains voltage / switching voltage (AC 230 V / AC/DC 24 V) must be
supplied as an external voltage to the terminals.
The lines must be secured on the device with strain relief.
The sizing and fusing of the lines are oriented to overall load and local
regulations.
Actuators up to 100 VA: Lengths of up to 300 m / 1000 ft are admissible.
Wiring must comply with local regulations.
Taking account of the permissible voltage drop, the cable between the switching
outputs and the equipment to be switched may be up to 300 m / 1000 ft long
(DXR2: 80 m / 260 ft).
The permissible lengths are calculated as follows:
Voltage drop of max. 7 % (1.68 V) on the AC 24 V operating voltage for the
actuator.
Cable cross section
Power
2
/ AWG14
2.50 mm
2
/ AWG16
1.50 mm
2
/ AWG18
1.00 mm
2
/ AWG20
0.75 mm
The outgoing and return cables may each have the indicated length.
Use cable cross section suited for 10 A according to local regulation.
7.4

Connecting the differential pressure sensor

Avoid bends and pressure when attaching the tube.
Connect the "+" connection on the side with the higher pressure and the "–"
connection on the side with the lower pressure.
A tube length of 2 m (6 ft) is recommended.
Desigo TRA Engineering, mounting and installation
Wiring of field devices (without bus)
Cable length for AC 24 V
2 VA 5 VA 10 VA
300 m 300 m 235 m
1000 ft 1000 ft 770 ft
300 m 300 m 150 m
1000 ft 1000 ft 500 ft
300 m 185 m
1000 ft 600 ft 300 ft
290 m 120 m
960 ft 380 ft 190 ft
20 VA 50 VA
120 m
390 ft 150 ft
75 m
250 ft 100 ft
95 m 50 m
150 ft
60 m 30 m
95 ft
CM111043en_09
2016-02-22
47 m
30 m
20 m
60 ft
12 m
40 ft