User Manual

5
Siemens CM1N9204en
Smart Infrastructure 2020-03-17
Potential-free relay outputs AC 230 V
Potential-free relay outputs allow for switching loads up to AC 250 V, 4 A (3 A). The circuits
have no internal fuse. They must have an external fuse (≤ 10 A).
Sizing Triacs on preloaded applications
The entire load (Triacs) for actuators cannot exceed 4 VA (6 VA briefly for heating up
thermal actuators).
On preloaded applications, PWM, priorities, alternating locking, and division of sequences
ensures that no more than one Triac is active at any time.
For details, see Installation guide Desigo Room Automation CM111043.
In other words, only the highest connected load on one of the Triacs is relevant to calculating
power.
An exception is the use of Triacs as digital outputs. Triacs as digital outputs are not subject
to locking or prioritization and must be added to the power consideration.
They must be operated with internal power to protect Triac outputs against overloading.
The maximum overall load is calculated as follows:
Highest load at one of the Triacs used by the application
+ Load at digital outputs
Examples
Example 1: DXR2x10.., 09T Example 2: DXR2.x10.., 09T
Use Type Signal Load Use Type Signal Load
Fan coil heating STP73 PWM 2.5 W /
(6 VA)
Radiator STP73 PWM
5...50%
2.5 W / (6 VA)
Chilled ceiling
cooling
STP73 PWM 2.5 W /
(6 VA)
Radiator STP73 PWM
5...50%
2.5 W / (6 VA)
Outside air
damper
GEB131.1
E
3-
position
4 VA Chilled ceiling STP73 PWM
5...50%
2.5 W / (6 VA)
Digital output - - - Chilled ceiling STP73 PWM
5...50%
2.5 W / (6 VA)
Overall load 4 VA / (6 VA) 2.5 W / (6 VA)
Sizing DC 0…10 V outputs and field supply
Total load (V~) cannot exceed 4 VA (6 VA briefly for actuator synchronization at start up or
boost heating of thermal actuators).
The DC 0…10 V outputs supply max. 1 mA.
Example 1: DXR2x09 Example 2: DXR2.x09
Use Type Signal Load Use Type Signal Load
Fan coil heating SSB61 DC
0...10 V
2.5 VA Radiator STP63 DC 0...10 V 2.5 W / (6 VA)
Chilled ceiling
cooling
- - - Radiator - - -
Outside air
damper
GLB161.1
E
DC
0...10 V
3 VA Chilled ceiling STP63 DC 0...10 V 2.5 W / (6 VA)
Digital output Relay BO 0.5 VA Chilled ceiling - - -
Overall load 3.5 VA 2.5 W / (6 VA)