User Manual

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Siemens Non-communicating room controllers CA2N3881en_02
Building Technologies RXA20.1, RXA21.1, RXA22.1 2012-08-28
STOP
Caution
 Fans connected to relay outputs Q14 … Q34 must not be operated in parallel.
For parallel operation use cut-off relays or slave controllers.
 At Q4 (max. resistive load 1.8 kW), use additional external fuses of max. 10 A
to protect the pcb tracks.
For information on the compatibility of the various field devices with the RXA20.1,
RXA21.1 and RXA22.1 room controllers, refer to the relevant application description.
Parallel connection of a number of thermic valve actuators to output Y1 using the UA1T
power amplifier.
The same principle applies to outputs Y2 … Y4. Note that the simultaneous load on
outputs Y1 … Y4 must not exceed 9.5 VA (power consumption at input X1 of the UA1T:
0.5 VA)
1
2
3
4
NS
LS
COM
X1
AC 24 V
Y1.1
Y1.1
70206
6
7
Y1
G
Y1
G0 G
8
7
6
5
COM
Y1
COM
Y1
N2
1
2
3
4
NS
LS
COM
X1
Y1.1
Y1.1
8
7
6
5
COM
Y1
COM
Y1
N2
N1
N1 RXA20.1, RXA21.1, RXA22.1
N2 UA1T (see data sheet CA2N3591)
Y1 AC 24 V thermic valve actuator
Y1.1 AC 24 V thermic valve actuator (max. 2 STP72E actuators per Y1 output on the UA1T)
– The UA1T requires an AC 24 V supply voltage
– The UA1T is not suitable for the connection of 3-position actuators.
Note
Connecting a
power amplifier
Notes