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Siemens RDU340… Basic Documentation CE1P3078en

Building Technologies Functions 11 July 2008

4.7 Control output

Different control output signals are available depending on the controller type.

Control output

Type reference

on/off 3-position DC 0…10 V

RDU340 Y21 (1) -- Y10 (1)

( ) Number of outputs

The demand calculated by the PI control from the current room temperature and

setpoint is provided to the valve actuator as a continuous DC 0...10 V signal via

output Y10.

The electrical heater receives an ON command via the auxiliary heating control

output Y21:

1. When the acquired room temperature is below “setpoint for electric heater”.

2. When the electrical heater has been switched off for more than 1 minute.

The OFF command for the electrical heater is output:

1. When the acquired room temperature is above the setpoint (electric heater).

2. When the electrical heater has been switched on for more than 1 minute.

A safety thermostat (to prevent overheating) must be provided externally.

Overview of control

output

DC 0..10 V control

signal

Electrical heater

control signal

(2-position)

Caution

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