User Manual

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Siemens RXB39.1 – Room controller CM2N3875en_08
Building Technologies 2016-05-18
Disposal
The device is considered an electronics device for disposal in terms of European
Directive 2012/19/EU and may not be disposed of as domestic garbage.
• Dispose of the device through channels provided for this purpose.
• Comply with all local and currently applicable laws and regulations.
Engineering
Topology
Tree, line, or star
NO closed loops
Cable length
Max. 1000 m (sum of all cables of a line
(for details refer to document CM110381)
Cable type
E.g. YCYM 2 x 2 x 0.8 mm
Number
of RXB Controllers per
Network
Max. 45
Bus supply
Up to 45 RXB-controllers:
5WG1 125-1AB12
Bus terminator
Not required
• The RXB39.1 room controller operates with a mains supply voltage of AC 230 V.
• The sizing and fuse protection of the power supply cables depend on the total
load and on local regulations.
• If serial wiring is applied on the terminal block L / N, the connection will be inter-
rupted if the block is removed from the controller (the jumpers 19-19 and 21-21
are on the PCB, not in the block, see terminal diagrams on page 10)
• Different phases may be connected to the terminals 21 (L), 23 (Q13) and
26 (Q33).
• All AC 230 V conductors must be secured with cable ties.
• The volt-free releasing relay output for the fan allows the switching of a load up
to AC 250 V, 5(4) A.
• The volt-free releasing relay output for the heating coil switches a resistive load
up to 1.8 kW, max. 10 A.
• The circuits must be externally fused (≤ 10 A) as there are no internal fuses.
• The cables connected to the room controller must be secured with cable ties.
• The DC 0 … 10 V control outputs YC1, YC2 deliver max 1.5 mA.
• The AC 24 V supply output G (next to YC2) delivers max. 6 VA.
• The DC 0 … 10 V control output YC3 delivers max 1.5 mA.
• The controlled devices (valve and damper actuators) receive their power directly
from the room controller. This means that a separate AC 24 V supply is only
necessary for the field devices require more than a total of 6 VA.
KNX bus
AC 230 V
supply cables
Volt-free
relay outputs
AC 230 V
DC 0...10 V outputs
– Valve actuators
– Fan control
AC 24 V supply for
field devices (G)