User Manual

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Siemens RXC20, RXC21, RXC22 – Room controllers CA2N3834en_12
Building Technologies 2015-12-23
Technical data
Power supply
Operating voltage
AC 230 V ± 10 %
Frequency
50/60 Hz
Power consumption with
output field devices connected
max. 12 VA
Internal fuse
Thermal, non-resetting
External supply line protection
(EU)
Slow
-blow fuse max. 10 A or
Circuit breaker max. 13 A
Characteristic B, C, D according to EN 60898
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 Ω
Contact insulation resistance
min. 50 kΩ
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 exceed +20% with loads under 2VA)
Output current
max. 0.5 A
To
tal 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 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 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
single pole
Contact rating with AC voltage
Max. admissible load (purely resistive)
max. 1.8 kW
Fusing
External fuse (essential)
max. 10 A, see power supply
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
LONWORKS® bus
PPS2 baud rate
4.8 kbps
LONWORKS® baud rate
78 kbps
LONWORKS® 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