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Siemens
RXC20, RXC21, RXC22 – Room controllers
CA2N3834en_09
Building Technologies
2013-06-16
Technical data
Power supply
Operating voltage
AC 230 V ± 10 %
Rated voltage
AC 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
AC 24 V triac outputs, Y1 ... Y4
Quantity 2
(RXC20,
RXC22)
4 (RXC21)
Output voltage
AC 24 V ON/OFF, PDM or 3-position: +/–20%
(May 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 se
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
ON
W
ORKS
® bus
PPS2 baud rate
4.8 kbps
L
ON
W
ORKS
® baud rate
78 kbps
L
ON
W
ORKS
® bus
Interface type
L
ON
M
ARK
® 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
