Siemens Desigo RXC32.1 User manual

CA2N3845en_06

2013-06-18

Building Technologies

3845

Desigo™ RXC

Room controller

RXC32.1 / RXC32.5

for VAV systems,

with LONMARK-compatible bus communication

The RXC32 controller is used for VAV room temperature control in individual

rooms.

•Control of the supply or extract air with volume control dampers, with or

without reheaters

•Downloadable application software

•LONMARK-compatible bus communications

•For use in the Desigo building automation and control system

•Control of damper actuators with AC 24 V, 3-position signal

•Control of electric or LPHW reheaters with AC 24 V or AC 24 V 3-position

signals

•Built-in air flow sensor

•AC 24 V operating voltage

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Application

The RXC32 controller is optimised for the control of variable air volume (VAV) systems.

It is designed for control of the supply or extract air with volume control dampers. The

controller may also be used for the control of electric or LPHW reheaters.

The controller application is determined by downloadable application software, also

referred to simply as the “application”. The various applications and the associated

functions are described in detail in the applications library (V1: CA2A3810,

V2: CA110300).

The controllers are delivered pre-loaded with a particular application or with basic

application 00032. The basic application, which contains only I/O module functions, is

overwritten with the definitive application in the commissioning phase. The RXT10

commissioning and service tool is used for this purpose (see “Commissioning”).

In conjunction with a building automation and control system, the RXC32 controller can

also be used as a universal I/O module, e.g. to register digital signals or to control

various equipment (ON/OFF or pulse control with AC 24 V). In this case the controller is

loaded with basic application 00032. The inputs can then be read and the outputs

overridden via the building automation and control system.

Functions

The controller functions are determined by the selected application and its parameters.

For a detailed description of functions, refer to the Desigo RXC applications library (V1:

CA2A3810, V2: CA110300).

Certain input and output parameters can be set for various functions making it possible

to cover a wide range of VAV systems. (For parameter settings for the various

applications, refer to the Desigo RXC applications library (V1: CA2A3810,

V2: CA110300).

Input

Function

−Occupancy sensor (volt-free contact)

−Window switch (volt-free contact)

X1 −LG-Ni 1000 temperature sensor (passive)

−

Air quality sensor (DC 0…10 V)

Output

Function

Y1 and Y2

−

3-position damper actuators (AC 24 V)

−Radiator with thermic valve (AC 24 V, PDM)

−Electric reheater (AC 24 V, on/off)

Y3 and Y4

−

LPHW reheater with motorised valve (AC 24 V, 3-position)

When Desigo RXC is integrated into a building automation and control system

additional functions become available such as time scheduling, central control of

setpoints, etc. (refer to the Desigo INSIGHT documentation for further information).

Use as an I/O module

Inputs and outputs

Integration into the

building automation

and control system

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Types

Type SSN Description

RXC32.1

RXC32.5

S55373-C116

Room controller for VAV systems

RXZ30.1 Accessory: Terminal covers

Ordering

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

The controllers will be delivered with basic application 00032.

The RXZ30.1 terminal covers are supplied in packs of 1 pair and must be ordered

separately).

Example:

30 Room controllers for VAV systems RXC32.5/00032

30 Pairs of terminal covers RXZ30.1

Compatibility

For operation of the RXC32 room controller, a room unit from the QAX… series may be

used in conjunction with conventional momentary contact switches for lighting and blind

control. Alternatively, the flexible room units, QAX50.1 or QAX51.1 may be used.

See the RX hardware overview (CA2N3804) for a summary of the available field

devices.

Mechanical design

The RXC32 controller consists of a housing base, a housing cover and the printed

circuit board with connection terminals. The controller also has a tool socket, a service

LED and a service pin.

Connection

for volume

measurement (+)

Housing cover

Connection

for volume flow

measurement (-)

90130

Cable restraints

Plug-in

connection terminals

for LONWORKS® bus

Housing base

Service LED

Service pin

Tool socket

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Terminal covers (RXZ30.1) are available as an option to protect the connection

terminals from physical contact and contamination. The terminal covers also provide

strain relief for the cables. The service LED remains visible when the terminal covers

are in place, and the service pin can be operated with a pointed implement. When

fitting the terminal covers ensure that they lock into place.

80049

Removing the terminal cover

Bar code, Code 128

(Identification)

Identification number

Protection standard

Temperature range

(0 … 50 °C)

Test date, series

(Z, A, B, C…)

Serial No.

Factory-loaded

application

Definitive

application

Location

Options for use of the labeling fields “Appl.” and “Loc.”:

−Hand-written entry of the location and the actual application… or

−Printed adhesive label (printed from the RXT10 commissioning and service tool)

All connection terminals are detachable plug-in terminals. They are arranged so that,

under normal circumstances, all incoming and outgoing cables can be connected

without crossing.

The conductors to the connection terminals can be

secured with cable ties to the housing base.

80170

Terminal covers

Label

Note

Connection terminals

Cable strain relief

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The sensor uses an integrated NTC thermistor to measure the cooling effect of the air

flow. The effect of the air temperature is compensated by the sensor. The controller

processor calculates the air flow by means of the sensor signal.

The RXC32 controller communicates with other devices via the following interfaces:

•LONWORKS® bus (terminals CLA and CLB) for communication with:

−the PXR system controller or the NIDES.RX interface (to Desigo)

−other Desigo RXC devices

−LONMARK-compatible 3rd party devices (e.g. presence detector)

•PPS2 (terminals CP– and CP+):

−Interface to the QAX… room units. (In addition to PPS2, the LONWORKS® bus is

also looped to the tool socket on the room unit.)

•Tool socket (RJ45) on the controller or room unit, for:

−RXT10 commissioning and service tool (LONWORKS® bus)

−RXT20.1 service terminal (PPS2)

The diagram below shows the wiring of the LONWORKS® bus and PPS2 interface when

a QAX… room unit is connected. It also shows the options for connecting the RXT10

commissioning and service tool and the RXT20.1 service terminal.

The yellow service LED shows the current operational status of the controller by means

of different flashing patterns (see the RXT10 user manual, CM110669).

The service pin is used to identify the controller in the commissioning phase. When the

pin is pressed the controller’s identification number is transmitted to the RXT10

commissioning and service tool.

Flow sensor

Communication

LONWORKS®-Bus

and PPS2

Service LED

Service pin

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Disposal

The devices are classified as waste electronic equipment in terms of the European

Directive 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 Desigo RXC installation guide, document CA110334, contains the relevant

engineering information for the LONWORKS® bus (topology, bus repeaters, bus

termination, etc.) and for the selection and dimensions of connecting cables for the

supply voltage and field devices.

See “Connection diagrams” for information on connecting field devices.

The controller operates with an AC 24 V supply voltage (SELV / PELV). The supply

cable must be protected with at least 10 A.

The controlled devices (valves and damper actuators) are supplied directly from the

controller. The maximum load on the outputs must not be exceeded (see “Technical

data”).

This device has no circuit breakers for supply lines to external consumers (field power

supply)!

Line insulation must always be sufficient for the available rated voltage.

When forwarding supply voltage (for 24 V low voltage as well) to external consumers,

the wiring cross sections must at any rate be adapted to the preswitched overcurrent

protection device. Please comply under all circumstances with local regulations.

The power consumption of the connected devices must be taken into account when

sizing the transformer.

•The simultaneous load on outputs Y3… Y6 must not exceed 24 VA.

•The maximum load on each output must not exceed 12 VA.

Equipment

Y1, Y2

1 3-position motorised actuator GDB…1E

2 VA

Y3 (Cooling)

2 thermic valve actuators, type STP72E

6 W

Y4 (Heating)

2 thermic valve actuators, type STP72E

6 W

Simultaneous load:

2 motorised actuators (both ON continuously)

4 VA

2 thermic valve actuators *

6 W (12 W) **

10 W (16 W)

* The heating and cooling sequences are never operative simultaneously. Therefore,

only the actuators for one of the two sequences need to be included when

calculating the total load.

** When cold, thermic valve actuators have a consumption of approximately 6 W. A

maximum of two thermic actuators may be connected to any one Y... output.

AC 24 V supply

Caution

AC 24 V triac outputs

Example

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Mounting

The controller can be mounted in any orientation as follows:

90131

Rail mounting

The housing base is designed for snap-

mounting on DIN rails, type EN50022-

35x7.5 (can be released with a

screwdriver)

Surface mounting

There are four drill holes for screw

mounting (see “Dimensions” for drilling

diagram). The housing base is fitted

with raised supports.

Screws: Max. diameter 3.5 mm

When mounting note the following:

•Ensure adequate air circulation to dissipate heat generated during operation.

•Easy access is required for service personnel.

•Local installation regulations must be observed.

The mounting instructions and a drilling template are printed on the controller

packaging.

•Avoid bends and constrictions when connecting the tubing

•Connect the “+” connection to the higher pressure side and the “–“ connection to the

lower pressure side.

•The recommended tube length is in the range 700 mm … 2 000 mm

•When using an air filter, install it on the high pressure side (“+”), with the air flowing

through the filter in the correct direction.

•Use an air filter to prevent the accumulation of dirt particle deposits on the sensor

element, especially when the extract air is contaminated (see technical data).

Commissioning

The RXC32 controller is commissioned with the RXT10 commissioning and service

tool. This is connected to the LONWORKS® bus via a tool socket (on the controller or

room unit).

The commissioning procedure for the entire Desigo RXC range is described in detail in

the RXT10 user manual, document CM110669.

The labeling fields “Appl.” and “Loc.” on the controller are used to indicate the

application actually loaded and the location of the controller, either in writing or by use

of printed adhesive labels (see “Label” under “Mechanical design”).

Connection, flow sensor

Labeling

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All applications (including basic application 00032) allow direct interrogation of the

inputs and control of the outputs using the RXT10 commissioning and service tool. This

makes it possible to test the installation and to operate connected plant provisionally

before the complete Desigo RXC system is commissioned.

•The LONWORKS® bus plug (terminals 23 and 24) can be removed and reconnected

at any time, even while the controller is in operation. Only the original bus plug may

be used.

•Overloading outputs Y1 … Y4 may cause the thermal fuse to trip and disable the

controller. After solving the problem, briefly disconnect and reconnect the power

supply. The controller will resume normal operation after a delay of approximately 10

minutes.

•Outputs Y1 … Y4 are not protected against accidental connection to AC 24 V.

This can damage the triacs.

•For accurate measurement of the air volume, make sure that the tubes are

connected correctly.

Technical data

Power supply Operating voltage SELV / PELV AC 24 V ± 20 %

Rated voltage

AC 24 V

Frequency

50/60 Hz

Power consumption

Without field devices

With field devices

6 VA

Max. 33 VA

Caution

Internal fuse

Thermal, automatic reset

Supply cable protection (external fuse)

Transformer with secondary limitation

max. 10 A or

External secondary power fuse with

max. T 10 A non-renewable fuse or

max. C 13 A circuit breaker

is required in all cases

Inputs Signal inputs for volt-free contacts

Quantity

Contact voltage

Contact current

Contact transfer resistance

Contact insulation resistance

Not suitable for pulse control

2 (D1, D2)

DC 33 V

DC 8 mA

Max. 100 Ω

Min. 50 kΩ

Measured value input for temp. measurement

Quantity

Suitable temperature sensors

Measuring range

Sensor current

Resolution

Accuracy

1 (X1) 1)

LG-Ni 1000

–40 ... 110 °C

2.5 mA

≤0.2 K

At 25 °C ±0.2 K

1) X1 selected by option button in RXT10 tool LG-Ni 1000 / 0 ...10 V

Function test

Notes

STOP

Note!

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Outputs

Caution

Supply outputs For field supply

Output voltage

Fuse

AC 24 V (transit power)

No internal fusing

Fusing on the supply line required

under all circumstances

Triac outputs AC 24 V

Quantity

Output voltage

Permissible load current

Power limitation

Total nominal load

(load on all triacs simultaneously)

4 (Y1 ... Y4)

AC 24 V on/off, PDM or 3-position

(selected by switch)

Max. 0.5 A

1.85A PTC, resetting

(common for all triacs)

Max. 24 VA

Flow sensor

Tube connections (nipple diameters)

Measuring range

Overload range

Volume measurement

Accuracy with dynamic calibration

Accuracy with static calibration

∅5.2 mm

0…300 Pa

0…100 k Pa

CEN TC247 Accuracy class 2

CEN TC247 Accuracy class 1

Air filter Example: air filter ALG 3 ½ SPF Can be ordered from Schupp AG

(www.sf-filter.ch), order number AL700/1.

Interfaces Interface with room unit

Number of room units connectable

Interface type for room unit

for RXT10

PPS2 baud rate

LON baud rate

Max. 1

PPS2

LON

4.8 kBit/s

78 kBit/s

LONWORKS®-Bus

Interface type

Transceiver

Baud rate

Bus topology and bus termination

LON (LONMARK-compatible),

electrically isolated

on RXC32.1: FTT-10A

on RXC32.5: FT 5000

78 Kbps

See Installation guide, CA110334

Cable connections Plug-in terminal blocks

Solid conductors

Stranded conductors without

connector sleeves

Stranded conductors with connector sleeves

(DIN 46228/1)

Rising cage terminals

1 x 0.2 ... 2.5mm2

or 2 x 0.2 ... 1.0 mm2

1 x 0.2 ... 2.5mm2

or 2 x 0.2 ... 1.5 mm2

1 x 0.25 ... 2.5mm2

or 2 x 0.25 ... 1.0 mm

Max. tightening torque

0.6 Nm

Single cable lengths

Signal inputs D1, D2

Measured value input X1

Triac outputs AC 24 V, Y 1 … Y4

Interface to room unit

Cable type

LONWORKS® bus

Cable type

Tool connecting cable

See Installation guide, CA110334

Max. 100 m with diameters ≥0.6 mm

Max. 100m where A ≥1.5 mm2

Max. 115 m where A= 0.75 mm2

(including tool connecting cable)

4-core, twisted pair, unscreened

See Installation guide, CA110334

Max. 3 m length

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Housing protection standard Protection standard to EN 60529 IP30 with terminal cover fitted and

wall mounted without DIN rail

All other mounting arrangements: IP20

Protection class

Insulation protection class

III

Ambient conditions Operation

Temperature

Humidity

Class 3K5 to IEC 60,721-3-3

0 ... 50 °C

< 85 % rh

Transport

Temperature

Humidity

Class 2K3 to IEC 60,721-3-2

– 25 ... 65 °C

< 95 % rh

Standards and directives

Product safety

Automatic electronic controls for household

and similar use

EN 60730

-1

Electromagnetic compatibility

Immunity (ndustrial & residential)

EN 60730-1

Emissions (residential)

EN 60730-1

compliance

Meets requirements of EMC directive

2004/108/EC

Meets requirements of RoHS directive

2011/65/EU

UL compliance

UL916

C-Tick conformity (EMC)

AS/NZS 61000-6-3

Environmental compatibility The product environmental declaration

CA2E3840 contains data on RoHS com-

pliance, materials composition, packaging,

environmental benefit, disposal

ISO 14001 (Environment)

ISO 9001 (Quality)

Dimensions See dimension diagrams

Width in DIN modular spacing units 8.5

Weight

Excluding packaging

0.28 kg

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