Siemens QAX34.1 Bedienungsanleitung

CA2N1645en_02

30 Jun 2009 Building Technologies

1645

DESIGO™ RX

Room unit with PPS2

interface

QAX34.1

for use with: – devices of the ranges DESIGO RXC, RXB, RXL, and RXA (PPS2)

– DESIGO PX Automation stations 1)

– devices with a PPS2 interface

Room temperature measurement

Rocker switch for adjustment of the room temperature setpoint

Rocker switch for control mode selection ( / Auto) and manual control of

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

PPS2 interface to controller

LCD with room temperature and control mode display

Socket for commissioning and service tool or service terminal

Use

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

sure the room temperature and for operation of the room controller. The functions of the

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

the room unit is suitable for control of a fan-coil system.

It can also be used in conjunction with a DESIGO PXC… automation station 1).

The room unit incorporates a socket for a commissioning and service tool or service

terminal. This tool socket provides access via the PPS2 interface or via a bus system

(e.g. LONWORKS® bus) to the connected individual room controller.

1) If room units QAX32.1, QAX33.1, QAX34.1, or QAX84.1 are used in conjunction with a PXC auto-

mation station, the room unit will show the request of the user and not the effective state.

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

Ordering

When ordering, please specify the quantity, product name and type code.

Example:

30 Room units QAX34.1

Equipment combinations

The room unit is suitable for use in conjunction with all controllers which incorporate a

PPS2 room unit interface (e.g. DESIGO RX, DESIGO PX).

Mechanical design

The room unit is designed for surface mounting (with knock-outs for cable entry from

the top or bottom) or for mounting on a recessed conduit box with the cables connected

from the rear.

The unit comprises a housing and base unit, connected by releasable snap-fittings.

The base unit accommodates the screw terminals which have an integrated terminal

strip.

The housing accommodates a printed circuit board, room temperature sensor element,

setpoint adjuster, rocker switch for mode selection and fan speed selection, plug-in

connectors and a socket for the commissioning and service tool or service terminal.

Both the housing and base are made of plastic.

Base unit

Housing

80083

80084

Socket for the commissioning

and service tool or service

terminal

80166A

Room temperature display and sequence (heating or cooling)

Rocker switch for room temperature setpoint adjustment

Indication of current control mode or current fan speed

Rocker switch for mode selection and fan speed

The actual functions of the operator controls and indicators are determined by the con-

troller (based on the selected application and associated parameters). The description

below covers all possibilities for these items.

The controller control mode can be selected on the basis of occupancy, using the

rocker switch on the room unit. The same switch can also be used for manual selection

of up to three fan speeds.

Operator controls

and indication

Note

Rocker switch for mode

selection and fan speed

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

Pressing once in the direction of the left arrow switches one stage to the left, and press-

ing once in the direction of the right arrow switches one stage to the right. The current

control mode or the manually selected fan speed is indicated in the display panel by a

horizontal bar below the associated symbol.

Position Fan speed control 1) Control mode

Fan controlled automati-

cally by controller

The controller operates at the setback

setpoints (at night, or when room is un-

occupied or occupied intermittently)

Fan controlled automati-

cally by controller

Comfort mode (room occupied)

Manual, fan speed 1

Manual, fan speed 2

Manual, fan speed 3

1) For details of these functions, refer to the application description for the relevant controller range

Press the switch once to switch from a display of the current room temperature to a

display of the setpoint. Each further operation of the +or –switch raises or lowers the

setpoint by 0.5 K or 1.0 °F (the unit of measurement is determined by the controller).

The controller also determines the maximum adjustment range allowed.

In normal operation, the following may be displayed (depending on the controller con-

figuration). For details of these functions, refer to the application description for the

relevant controller range.

Display element

(examples)

Description

Room temperature in °C (resolution 0.5 °C)

Room temperature in °F (resolution 1.0 °F)

Digital display of setpoint adjustment

(displayed only while relative adjustment is in progress).

Digital display and scale

(displayed only while absolute adjustment is in progress)

Control sequence: Cooling

Control sequence: Heating

Room units with mode and fan-speed selection enabled:

Fan speed 1: ON

In room units allowing mode selection only:

Auto: ON

Rocker switch room for

temperature setpoint

adjustment

LCD display

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

01884

Address plugs inside the housing

They allow setting the address in cases where several

room units are connected to one controller.

The room units are delivered with address 1.

Disposal

The device is classified as waste electronic equipment in terms of the European Direc-

tive 2002/96/EC (WEEE) and should not be disposed of as unsorted municipal waste.

The relevant national legal rules are to be adhered to.

Regarding disposal, use the systems setup for collecting electronic waste.

Observe all local and applicable laws.

Engineering notes

The device receives its power from the connected controller via the PPS2 interface

(extra low voltage). Only one room unit may be connected to a RX… room controller.

A maximum of 5 room units may be connected to a PXC… automation station (they are

identified by different settings of their address plugs)

A twisted-pair cable is required for the connection to the controller.

DESIGO RX uses four-core cables, DESIGO PX uses two-core cables (see the respec-

tive installation guides). Screening is not required.

Mounting

The room unit is suitable for wall-mounting and for mounting on a recessed conduit

box.

Do not mount in recesses, shelves, behind curtains or doors, or above or near heat

sources.

Avoid exposure to direct sunlight or draughts.

The electrical wiring conduit must be sealed where it joins the room unit, to prevent

the occurrence of draughts in the conduit which could affect the sensor.

The specified ambient conditions must be complied with.

Mounting instructions are printed on the room unit packaging.

A mounting kit is included with the unit.

Installation notes

Local installation regulations must be observed.

The room unit is not protected against connection to AC 230 V.

ddress plugs

STOP Note!

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

Commissioning notes

After an interrupt of the PPS2 interface the communication will only be re-established

when the connected controller polls the PPS2 addresses. The duration of the corre-

sponding cycle is:

RXA: 10 sec; RXB, RXL and RXC: 3 min; PX: 30 sec.

When the supply voltage is connected (via PPS2 interface) or when the controller initi-

ates a reset, the room unit initially responds as follows:

Step Function Description

1 LCD test All segments of the display activated for approx. 5 s.

2 Identification by

controller

The display reads until the controller identifies the

room unit as a PPS2 component.

3 Room unit

ready for opera-

tion

1 second after identification by the controller, the room

unit is ready for operation.

If the room unit is connected to a LONMARK-compatible controller (DESIGO RX), the

display can be used as an aid to commissioning. If the RXT10 commissioning and ser-

vice tool initiates a wink command, the type of controller connected will be displayed on

the room unit. For example:

Controller type Display

RXC21.1

RXC30.1

Operating notes

During operation and commissioning, the LCD display also indicates errors, as follows

Display Description Error type

C: No communication with controller for more than 64 s

02: Firmware version (e.g. Version 2.0)

Room temperature sensor outside range 0 ... 40 °C S

Room unit not yet in list of PPS2 components (during

controller start-up phase)

Controller does not recognize room unit type D

Initial value after start-up, before the controller transmits a

signal

Controller transmits no valid T-value S

S Static error: The error code remains in the display until the cause of the error has been dealt with.

D Dynamic error: The error code will be displayed instead of the room temperature for 5 s after

occurrence of the error. The display will then revert to normal. While the error persists, the error

code will be re-displayed each time the + or – key is operated. The setpoint can be adjusted by

pressing the key again.

All other error codes indicate hardware faults.

Response on start-up

Wink function display

with LON-devices

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

Technical data

Supply voltage Operating voltage range SELV / PELV DC 12 ... 15 V

The room unit receives its power from the connected controller, via the PPS2 interface

Power consumption (from controller) Max. 0.10 VA

Function data Temperature sensor

Measuring element NTC resistor

Measuring range 0 ... 40 °C

Response time 8 min

Accuracy (5 ... 30 °C) 0.5 K

Accuracy (25 °C) 0.25 K

Setpoint correction

Correction range (determined by controller) max. 10 K (default 3 K)

Accuracy over full correction range 10 %

Display Type LCD

Functions displayed – Room temperature

– Setpoint adjustment

– Control mode

– Manually selected fan-speed

– Control sequence

– Error code

Interfaces Type of interface between controller and

room unit

PPS2

(point-to-point interface, Version 2)

Baud rate 4.8 kbit/s

Cable connections Connection terminals (screw terminals) Stranded or solid conductors

0.8 ... 2.5 mm2

Single cable length controller – Room unit See Installation guidelines:

DESIGO RXC: CA110334,

DESIGO RXB & RXL: CM110381

DESIGO RXA: CA2Z3884

DESIGO PX: CA110396

Cable type 2-core or 4-core, twisted pairs,

unscreened

Connecting cable for service tool Off-the-shelf, max. 3 m

Housing protection standard Protection standard to EN 60529 IP 30

Protection class Insulation protection class III

Ambient conditions IEC 721 Operation Transport

Ambient air conditions Class 3K5 Class 2K3

Temperature 0 ... 50 °C – 25 ... 70 °C

Humidity < 85 %rH < 95 %rH

Mechanical conditions Class 3M2 Class 2M2

Standards and directives Product standard Automatic electronic controls

for household and similar use

EN 60730-1

Electromagnetic compatibility

Immunity (industrial & domestic) EN 60730-1

Emissions (domestic) EN 60730-1

compliance

Meets requirements of EMC directive 2004/108/EC

UL compliance UL916

C-Tick conformity (EMC) AS/NZS 61000-6-3

Environmental compatibility The product environmental declaration

CA2E1645 contains data on RoHS compli-

ance, materials composition, packaging, envi-

ronmental benefit, disposal

ISO 14001 (Environment)

ISO 9001 (Quality)

2002/95/EC (RoHS)

Dimensions See “Dimensions”

Color Housing front NCS S 0502-G, RAL 9003 signal white

Housing, base unit, rocker switches RAL 7035 light grey

Weight Excluding packaging 0.12 kg

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

Connection terminals

The tool socket on the room unit provides access to the connected individual room

controller via the commissioning and service tool or the service terminal.

The bus cable (Terminals 3 and 4) is therefore looped to the tool socket (Pins 1 and 2).

The bus cable is not affected by the room unit.

For connection of a service terminal, the PPS2 interface (Terminals 1 and 2) is also

connected to the tool socket.

87654321

C–

C+

CP–

CP+

80085

PPS2 interface, supply voltage

CP+ 1 Device supply, Data PPS2 (pos.)

CP– 2 Device supply, Data PPS2 (neg.)

Bus connection (looped to tool socket)

C+ 3 With LONWORKS® bus (DESIGO RXC): CLA

C– 4 With LONWORKS® bus (DESIGO RXC): CLB

5 ... 8 Not used

Standard type RJ45 tool socket.

3206Z01

2345678

With LONWORKS® bus (DESIGO RXC): CLA

With LONWORKS® bus (DESIGO RXC): CLB

Not used

CP+ Data PPS2

CP– Data PPS2

Connection diagram (Example: RXC)

The following example shows the room unit connected to a DESIGO RXC room

controller:

1741 A03

PPS2

Tool

7812

4321

C–

C+

CP–

CP+

CP–

CLA

CLB

PPS2

LonWorks® Bus

= Twisted pair

R1 Room unit QAX34.1

N1 Room controller RXC...

A Connection for RXT10 commissioning and service tool

B Connection for service terminal with PPS2 interface

Terminal layout

Tool socket

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Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02

Building Technologies 30 Jun 2009

Dimensions

9,5

4,2

80088

100

ll dimensions in mm

2000 - 2009 Siemens Switzerland Ltd. Sub

ect to chan

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