Siemens QAX34.1 User manual

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.

2/8
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

3/8
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
1)
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

4/8
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.
A
ddress plugs
STOP Note!

5/8
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)
D
Room temperature sensor outside range 0 ... 40 °C S
Room unit not yet in list of PPS2 components (during
controller start-up phase)
D
Controller does not recognize room unit type D
Initial value after start-up, before the controller transmits a
signal
S
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

6/8
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

7/8
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.
1
3206Z01
2345678
With LONWORKS® bus (DESIGO RXC): CLA
With LONWORKS® bus (DESIGO RXC): CLB
Not used
Not used
Not used
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
A
R1
B
7812
4321
C– C+ CP– CP+
N1
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
.
.
.

8/8
Siemens QAX34.1 – Room unit with PPS2 interface CA2N1645en_02
Building Technologies 30 Jun 2009
Dimensions
9,5
32
34
4,2
60
80088
90
100
56 60
56
A
ll dimensions in mm
2000 - 2009 Siemens Switzerland Ltd. Sub
j
ect to chan
ge