Siemens Desigo RXC20.1 - Technical Specifications; General Operating and Input Data; Output Specifications; Interface and Communication Data

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Siemens RXC20, RXC21, RXC22 – Room controllers CA2N3834en_09
Building Technologies 2013-06-16
Technical data
Power supply
Operating voltage
A
C 230 V ± 10 %
Rated voltage
A
C 230 V
Frequency 50/60 Hz
Power consumption with
output field devices connected max. 12 VA
Internal fuse Thermal, non-resetting
Operating data Control algorithm PI or PID
Inputs
Signal inputs D1, D2 Quantity 2
(for volt-free contacts) Contact voltage DC 16 V
Contact current DC 8 mA
Contact transfer resistance max. 100 
Contact insulation resistance min. 50 k
Not suitable for pulse control
Measured value input B1 Compatible temperature sensors LG-Ni 1000
Quantity 1
Measuring range 0 ... 50 °C
Sensor current 2.3 mA
Resolution 0.2 K
Measuring error at 25 °C sensor temp. (exclud-
ing cable)
max. 0.2 K
Outputs
A
C 24 V triac outputs, Y1 ... Y4 Quantity 2 (RXC20, RXC22)
4 (RXC21)
Output voltage
A
C 24 V ON/OFF, PDM or 3-position: +/–20%
(May exceed +20% with loads under 2VA)
Output current max. 0.5 A
Total nominal load
(at both outputs simultaneously)
max. 9.5 VA (e.g. 2 thermic valves, type
STE72 per heating and cooling sequence +
1 damper actuator 3.5 VA)
Relay outputs Q14, Q24, Q34
Quantity 1 (RXC20)
3 (RXC21, RXC22)
Relay type single pole
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  = 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 single pole
Contact rating with AC voltage
Max. admissible load (purely resistive) max. 1.8 kW
External fuse (essential) max. 10 A
STOP
..Note!
Q44 is only permitted for mains voltage,
not for security extra low voltage
Interfaces
Interface to room unit Number of room units connectable max. 1
Interface type for room unit
for RXT10
PPS2
L
ONWORKS® bus
PPS2 baud rate 4.8 kbps
L
ONWORKS® baud rate 78 kbps
L
ONWORKS® bus Interface type LONMARK® compatible,
electrically isolated
Transceiver on RXC2X.1: FTT-10A, on RXC2X.5: FT 5000
Baud rate 78 kbps
Bus topology, bus termination see installation guide, CA110334