Data Sheet for Product

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Siemens RXB21.1, RXB22.1 Room controllers CM2N3873en_11
Building Technologies 2016-05-18
• In the event of a long-term short circuit (approx. 4 minutes) or overload,
the thermal fuse in the transformer may trip.
Subsequently, the device must be exchanged.
• There is no protection against accidental connection on the AC 24 V side.
• Mains AC 230 V for the supply and for the relays must be disconnected before
plugging and unplugging the terminal blocks (danger of electric shock!)
• If serial wiring is applied on the terminal block 19/21, the connection will be
interrupted 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 pages
11 and 12).
Technical data
Power supply
Operating voltage
AC 230 V ± 10 %
Frequency
50/60 Hz
Power consumption with connected field devices
Max. 12 VA
Internal fuse
Thermal, non-resetting
External supply line protection
Slow-blow fuse max. 10 A or
Circui
t breaker max. 13 A
Characteristic B, C, D according to EN 60898
Operating data
Control algorithm
PI
Inputs
Signal inputs D1, D2
Quantity
2
(for volt-free contacts)
Contact voltage
DC 16 V
Contact current
DC 5 mA
Contact transfer resistance
Max. 100 Ω
Contact insulation resistance
Min. 50 kΩ
Switch time:
min. 20ms “ON”, min. 20ms “OFF”
Measured value input B1
Compatible temperature sensors
LG-Ni 1000
Quantity
1
measuring range
0 ... 50 °C
Sensor current
0.5 mA
Resolution
0.1 K
Measuring error at 25 °C sensor temp. (without cable)
max. 0.5 K
Outputs
AC24 V triac outputs , Y1 …
Y4
Quantity
2 (RXB22.1)
4 (RXB21.1)
Output voltage
AC 24 V ON/OFF, PWM or 3
-position: +/–20%
(May exceed +20% with loads under 2VA)
Permissible load current
Max. 0.5 A
Power limitation
No internal limitations
Total nominal load
(at both outputs simultaneously)
Max. 9.5 VA (e.g. 2 thermic valves, type
STP73
per heating and cooling sequence
+ 1 damper actuator 4.5 VA)
Relay outputs Q14, Q24, Q34
Quantity
3
Relay type
Monostable
Contact rating with AC voltage
Switching voltage
Max. AC 250 V, min. AC 19 V
Nominal current, resistive/inductive
Max. AC 5 A/4 A (cos ϕ = 0.6)
Making current 200 ms half-time
Max. 20 A
Switching current at AC 29 V
Min. AC 10 mA
Contact rating with DC voltage
Switching voltage
Max. DC 250 V, min. DC 5 V
Switching current at DC 5 V
Min. DC 100 mA
Switching capacity
Max. 20 W
Inductive load L/R
Max. 7 ms
Q44
Relay type
Monostable
Contact rating with AC voltage
Max. admissible load (resistive only)
Max. 1.8 kW
Fusing
External supply line protection
Slow-blow fuse max. 10 A or
Circuit breaker max. 13 A
Characteristic B, C, D according to EN 60898