Relay Outputs - Siemens Desigo RXB Technical Manual

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Building Technologies
– The subline length is limited to 3 meters for line topologies
(See section 4.5.2)
– You cannot switch multiple lines in parallel to increase wiring diameter!
∅
A max. simple line length
[mm 2 ] [mm] [m]
1,00 1,15 125
0,75 0,98 115
0,50 0,80 75
Address room devices is not supported in the room automation system DESIGO
RXB / RXL (in contrast to DESIGO PX).
Address 1 must, however, be set in the room units (factory setting).
3.1.6

Relay outputs

Fans are controlled using potential-free relay outputs. The following applied for the
wiring:
The maximum load of the relay contracts must be observed (see data sheets for
–
the corresponding controller)
The sizing and fusing of the power lines are oriented to overall connected load
–
and local regulations.
Fusing of switching circuits depends on the controller. The fused electrical
–
values must therefore be reviewed in the data sheets for the corresponding
controllers.
The lines must be fused on the controller with strain relief.
–
Controllers RXB22.1 and RXL22.1 also have a relay contract (Q44) for switching
electrical heating coils. Observe the following:
• The maximum power is 1.8 kW ohm load. Larger loads close the contact too
much.
• A external fuse of max. 10 A is planned to protect room controller circuits.
Installation guide RXB, RXL
Periphery wiring (without bus)
CM110381en_01
28 Feb 2009