User Manual

ManualsBrandsSiemens ManualsIndicating unitsEU Declaration of Conformity QAX34.3

CM2N1640en_05

2015

-12-23

Building Technologies

640

1640P01

Desigo

Room unit with PPS2

interface

QAX34.3

For use with:

– Equipment from the RXC, RXB, RXL and RXA (PPS2) ranges

– Desigo PX automation stations

–

Devices

with

PPS2

interface

• Measurement of the room temperature

• Bias switch for adjustment of the room temperature setpoint

• Bias switch for selection of the operating mode (

/Auto) and for manual

control of the fan in fan-coil systems (up to 3 speeds)

• LCD for display of room temperature and operating mode

• PPS2 interface to the controller

• Tool function for parameter setting and testing

of RXB/RXL controllers

Application

The room unit is used in rooms controlled by an individual room control system, to

measure the room temperature and for operation of a room controller. The functions of

the LCD display are determined by the controller. If manual fan-speed control is

enabled, the room unit can be used to operate a fan-coil system.

It is also suitable for use in conjunction with a Desigo PX automation station

In conjunction with the RXB / RXL controllers (FC-10 and later, CC-02) the QAX34.3

room unit can also be used for parameter-setting and for the wiring test

For details refer to the technical manual, CM110389 (RXB), CM110789 (RXL).

As a room unit:

As a tool:

1) In the QAX34.3 room unit the address (fixed to 1) cannot be changed.

If it is used with a PXC... automation station, the display shows the state requested

by the user (see page 3), rather than the actual state.

2) Wiring test only available with devices from index D (inside the housing, se page 2).

Summary of content (8 pages)

PAGE 1
640 1640P01 s Desigo RX Room unit with PPS2 interface For use with: • • • • • • QAX34.
PAGE 2
Ordering When ordering, please specify the quantity, product name and type code. Example: 30 Room units QAX34.3 Compatibility The room unit can be used with all controllers incorporating a PPS2 room unit interface (e.g. Desigo RX and Desigo PX 1) ). 1) The QAX34.3 room unit only works with Address 1. If it is used with a PXC... automation station, the display shows the state requested by the user, rather than the actual state.
PAGE 3
Operator controls and display panel + 1 2 3 4 Display of actual room temperature or adjustment value, and bar indicating sequence (heating/cooling), operating mode and fan speed.
PAGE 4
Engineering notes The room unit receives its power from the connected controller via the PPS2 interface (low voltage, SELV). Only one room unit can be connected to an RX... room controller. When connecting a room unit to a PXC… automation station, the room unit must be Address 1 (this address is permanently programmed in the room unit). The room unit must be connected to the room controller with a two-core twisted pair cable.
PAGE 5
Displaying the “Wink” function of KNX/EIB and LONWORKS devices If the room unit is connected to a room controller in the Desigo RXB, RXL or RXC range, the display can be used as an aid to commissioning. If the commissioning tool is used to transmit a Wink command, the room unit displays the type of room controller connected. For example: Room controller type RXB 21.1, RXL21,1, RXC21.1, RXC30.
PAGE 6
Technical data Supply voltage Operating voltage range DC 12 ... 15 V (SELV) The device receives its power from the connected controller via the PPS2 interface Power consumption (from controller) Max. 0.10 VA Operating data Temperature sensor Measuring element NTC resistance sensor Measuring range 0 ... 40 °C Response time ≤ 10 min Measuring accuracy (5 … 30 °C) ± 1.0 K Measuring accuracy (25 °C) ± 0.5 K Setpoint correction Correction range (defined by controller) Max.
PAGE 7
Electrical connections Terminal layout PPS2 interface, power supply 1 2 Device power supply, PPS2 data (positive) Device power supply, PPS2 data (negative) 1640A04 CP+ CP CP+ CP– Wiring diagram The example below shows the room unit connected to a Desigo RXB room controller. PPS2 R1 N1 N1 1640A05 R1 CP– CP+ CP+ CP– 1 2 = Twisted pair QAX34.3 room unit RXB… room controller 7/8 Siemens Building Technologies QAX34.
PAGE 8
Dimensions Dimensions in mm 26 30 112,3 89,45 Published by: Siemens Switzerland Ltd. Building Technologies Division International Headquarters Gubelstrasse 22 6301 Zug Switzerland Tel. +41 41-724 24 24 www.siemens.com/buildingtechnologies 1640M07 23,8 96 11,8 30 28 119 35 28 28 4 28 © Siemens Switzerland Ltd 2006 Delivery and technical specifications subject to change 8/8 Siemens Building Technologies QAX34.