Siemens Desigo RXC20.1 User manual

CA2N3834en_09

2013-06-16 Building Technologies

3834

Desigo™ RXC

Room controllers RXC20.1 / RXC20.5

RXC21.1 / RXC21.5

RXC22.1 / RXC22.5

For fan-coil systems, chilled ceilings and radiators

with LONMARK® compatible bus communications

The RXC20, RXC21 and RXC22 room controllers are used for temperature control

in individual rooms.

For 2-pipe or 4-pipe fan-coil systems, with or without change-over

For chilled ceilings and radiators

Control of AC 24 V PDM 1) thermic valve actuators, 3-position AC 24 V valve

and damper actuators, or electric heating coils

Volt-free relay contacts for fan control and electric heating coils

PI or PID control (depending on application)

Downloadable application software

LONMARK® compatible bus communications

For use in the Desigo building automation and control system

AC 230 V operating voltage

1) PDM = pulse/duration modulated

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Use

The RXC20, RXC21 and RXC22 room controllers are optimized for control of fan-coil

systems, chilled ceilings and radiators in individual rooms.

The following versions are available for fan-coil systems:

RXC20: 1-speed automatic fan control

RXC21: 1- to 3-speed automatic fan control

RXC22: 1- to 3-speed automatic fan control

with integrated relay for electric re-heating

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 RXC applications library. (V1: CA2A3810,

V2: CA110300).

The room controllers are delivered with the basic application 00020 (RXC20),00021

(RXC21) and 00022 (RXC22), respectively. 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 system, the RXC20, RXC21 and RXC22 room

controllers can also be used as universal I/O modules, e.g. to register binary signals or

to control various equipment (ON/OFF or pulse control with AC 24 V or volt-free relay

contacts).

In this case, the room controllers are loaded with basic application 00020, 00021 and

00022, respectively. The inputs can then be read and the outputs overridden via the

building automation system.

Functions

The room controller functions are determined by the selected application and its pa-

rameters and by the input/output configuration.

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

CA2A3810, V2:CA110300).

When Desigo RXC is integrated into a building automation system additional functions

become available such as time scheduling, central control of setpoints, etc. (refer to the

Desigo INSIGHT documentation for further information).

The RXC20, RXC21 and RXC22 room controllers differ only in the number of outputs

they provide:

Type SSN AC 24 V triac outputs Relay outputs

RXC20.1

RXC20.5

S55373-C111

For two thermic valve actuators

or one 3-position actuator

For 1-speed fan control

RXC21.1

RXC21.5

S55373-C112

For four thermic valve actuators

or two 3-position actuators

For 3-speed fan control

RXC22.1

RXC22.5

S55373-C113

For two thermic valve actuators

or one 3-position actuator

For 3-speed fan control

Internal relay for electric

heating coil

RXZ20.1 Accessories: Terminal covers

Use as an I/O module

Types

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Ordering

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

The controllers are delivered with the basic application 00020, 00021 or 00022, respec-

tively.

The RXZ20.1 terminal covers are supplied in packs of 1 pair and must be ordered sep-

arately.

Example:

30 RXC20.5 room controllers RXC20.5/00020

30 Pairs of terminal covers RXZ20.1

Compatibility

The QAX… room units and the Siemens field devices can be used with the RXC20,

RXC21 and RXC22 room controllers.

For details, refer to the RX hardware overview, CA2N3804.

Design

The RXC20, RXC21 and RXC22 room controllers consist 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.

Plug-in Connection terminals

Housing cover

Plug-in Connection terminals

70198

Cable restraints

Plug-in

connection terminals

for LONWORKS® bus

Housing base

Service LED

Service pin

Tool socket

Terminal covers (RXZ20.1) are available as an option, to protect the connection termi-

nals from physical contact and dirt. The service LED remains visible when the terminal

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

cable is connected to the room controller by breaking out the perforated cable entry

guide.

70200

Removing the terminal cover

Terminal cover

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Neuron ID

Bar code, Code 39

(ID number)

Protection standard

Temperature range

(0 … 50 °C)

Serial No.

Test date, series

(Z, A, B, C…)

Observe notes

in this document

Factory-loaded

application

Definitive

application

Location

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

Hand-written entry of the location and the loaded application ... or

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

All connection terminals are detachable plug-in terminals.

To avoid incorrect wiring, terminals which can be connected to AC 230 V (supply and

relay outputs) are physically separate from the other terminals.

Cable restraints must be used for the wires to termi-

nals 19 … 28 (AC 230 V). The conductors must be

secured with cable ties (see diagram).

3834J01

Ensure that the power is off before inserting or removing plug-in terminals

connected to a mains voltage.

The RXC20, RXC21 and RXC22 room controllers communicate with other devices via

the following interfaces:

L

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

PXX-Lxx, PXR system controller or NIDES.RX interface (to Desigo)

Other Desigo RXC devices

L

ONMARK®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 room controller or room unit, for:

RXT10 commissioning and service tool (LONWORKS® bus)

RXT20.1 service terminal (PPS2)

Label

(example RXC22.5)

Note

Connection terminals

STOP Note!

Warning!

Communication

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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 room controller by

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

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

When the pin is pressed the room controller’s identification number is transmitted to the

RXT10 commissioning and service tool.

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 RX installation guide, document CA110334, contains the relevant engineer-

ing 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.

The room controllers have an AC 230 V mains supply voltage. The controlled devices

(valves and damper actuators) are supplied directly from the room controller.

This means that a separate AC 24 V supply is not necessary for the RXC20, RXC21

and RXC22 room controllers and the associated field devices.

LONWORKS® bus

and PPS2

Service LED

Service pin

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The dimensions and fuse protection for the supply cables depend on the total load

and on local regulations. The cables must be secured with cable restraints.

If serial wiring is applied on the terminal block 19/21, the connection will be inter-

rupted if the block is removed from the controller (the jumpers 19-19 and 21-21 are

on the PCB, not in the block, see terminal diagrams on pages 10 … 12).

The volt-free relay outputs allow switching of loads up to AC 250 V, 5 A (4 A). The heat-

ing coil relay in the RXC22 switches resistive loads up to 1.8 kW.

The cable dimensions depend on the connected load and the local installation regula-

tions. The circuits must be externally fused (10 A) as there are no internal fuses.

The cables must be secured with cable restraints.

Parallel operation of the fans is not permitted.

The simultaneous load on outputs Y1 … Y4 must not exceed 9.5 VA.

Example: Y1 (heating) 2 thermic valve actuators, type STP72E 6 W

Y2 (cooling) 2 thermic valve actuators, type STP72E 6 W

Y3, Y4 (outside air) 3-position damper actuator 3.5 VA 3.5 VA

The maximum load is 9.5 VA for the heating sequence and 9.5 VA for the

cooling sequence. This is acceptable because the two sequences never

operate at the same time.

When using small loads (< 2VA), the voltage tolerance may be > + 20%

(see technical data, Triac outputs below)

Mounting instructions

The room controllers can be mounted in any orientation using the following fixing options:

70202

70203

Rail mounting

The housing base is designed for snap-

mounting on DIN rails, type EN50022-35 x

7.5 (can be released with a screwdriver).

Surface mounting

There are two drill holes for screw-mounting (see “Dimensions” for drill-

ing template). The housing base is fitted with raised supports.

Screws: Max. diameter 3.5 mm, min. length 38 mm

STOP Note!

Tightening torque for fixing screws max. 1.5 Nm

AC 230 V supply cables

AC 230 V volt-free

relay outputs

STOP Note!

AC 24 V triac outputs

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When mounting note the following:

The controller should not be freely accessible after mounting.

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.

Commissioning notes

The RXC20, RXC21 and RXC22 room controllers are commissioned with the RXT10

commissioning and service tool. The RXT10 is plugged into the tool socket on the

room controller or room unit for connection to the LONWORKS® bus.

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.” 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”).

All applications (including basic applications 00020, 00021 and 00022) allow interroga-

tion of the inputs and control of the outputs using the RXT10 commissioning and ser-

vice tool. This enables the fan-coil manufacturer to test the installed units before deliv-

ery.

The LONWORKS® bus plug (terminals 17 and 18) can be removed and reconnected at

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

used.

In the event of a long-term short circuit (approx. 4 minutes) or overload,

the thermal fuse in the transformer may trip.

Subsequently, the device must be exchanged.

There is no protection against accidental connection on the AC 24 V side.

Mains AC 230 V for the supply and for the relays must be disconnected before

plugging and unplugging the terminal blocks (danger of electric shock!)

If serial wiring is applied on the terminal block 19/21, the connection will be

interrupted if the block is removed from the controller (the jumpers 19-19 and

21-21 are on the PCB, not in the block, see terminal diagrams on pages 10 … 12).

Labeling

Function test

Note

STOP Note!

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Technical data

Power supply Operating voltage

C 230 V ± 10 %

Rated voltage

C 230 V

Frequency 50/60 Hz

Power consumption with

output field devices connected

max. 12 VA

Internal fuse Thermal, non-resetting

Operating data Control algorithm PI or PID

Inputs

Signal inputs D1, D2 Quantity 2

(for volt-free contacts) Contact voltage DC 16 V

Contact current DC 8 mA

Contact transfer resistance max. 100 

Contact insulation resistance min. 50 k

Not suitable for pulse control

Measured value input B1 Compatible temperature sensors LG-Ni 1000

Quantity 1

Measuring range 0 ... 50 °C

Sensor current 2.3 mA

Resolution 0.2 K

Measuring error at 25 °C sensor temp. (exclud-

ing cable)

max. 0.2 K

Outputs

C 24 V triac outputs, Y1 ... Y4 Quantity 2 (RXC20, RXC22)

4 (RXC21)

Output voltage

C 24 V ON/OFF, PDM or 3-position: +/–20%

(May exceed +20% with loads under 2VA)

Output current max. 0.5 A

Total nominal load

(at both outputs simultaneously)

max. 9.5 VA (e.g. 2 thermic valves, type

STE72 per heating and cooling sequence +

1 damper actuator 3.5 VA)

Relay outputs Q14, Q24, Q34 Quantity 1 (RXC20)

3 (RXC21, RXC22)

Relay type single pole

Contact rating with AC voltage

Switching voltage max. AC 250 V, min. AC 19 V

Nominal current, resistive/inductive max. AC 5 A/4 A (cos = 0.6)

Making current 200 ms half-time max. 20 A

Switching current at AC 29 V min. AC 10 mA

Contact rating with DC voltage

Switching voltage max. DC 250 V, min. DC 5 V

Switching current at DC 5 V min. DC 100 mA

Switching capacity max. 20 W

Inductive load L/R max. 7 ms

Q44 Relay type single pole

Contact rating with AC voltage

Max. admissible load (purely resistive) max. 1.8 kW

External fuse (essential) max. 10 A

STOP ..Note! Q44 is only permitted for mains voltage,

not for security extra low voltage

Interfaces

Interface to room unit Number of room units connectable max. 1

Interface type for room unit

for RXT10

PPS2

LONWORKS® bus

PPS2 baud rate 4.8 kbps

LONWORKS® baud rate 78 kbps

LONWORKS® bus Interface type LONMARK® compatible,

electrically isolated

Transceiver on RXC2X.1: FTT-10A, on RXC2X.5: FT 5000

Baud rate 78 kbps

Bus topology, bus termination see installation guide, CA110334

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Cable connections Plug-in terminal blocks

Solid conductors

Stranded conductors without connect-

or 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 mm2

Max. tightening torque 0.6 Nm

Single cable lengths see also installation guide, CA110334

Signal inputs D1, D2 max. 100 m with diameters 0.6 mm

Measured value input B1 max. 100 m

AC 24 V triac outputs, Y1 ... Y4 max. 100m where A 1.5 mm2

Relay outputs Q14, Q24, Q34, Q44 depends on load and local regulations

Interface to room unit max. 115 m where A= 0.75 mm2

(including tool connecting cable)

Cable type 4-core, twisted pair, unscreened

LONWORKS® bus max. 500 m

Cable type see installation guide, CA110334

Tool connecting cable max. 3 m

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

wall mounted without DIN rail

IP20 for all other mounting arrangements

Protection class Suitable for use in systems with protection class I or II

Ambient conditions Operation class 3K5 as per IEC 60721-3-3

Temperature 0 ... 50 °C

Humidity < 85 % r.h.

Transport class 2K3 as per IEC 60721-3-2

Temperature – 25 ... 65 °C

Humidity < 95 % r.h.

Standards and directives - Product standards EN 60730

marking

- EMC

Immunity (industrial & residential)

Emission (residential)

2004/108/EC

EN 60730-1

- Low Voltage Directive

Electrical safety

2006/95/EC

EN 60730-1

- RoHS

Techn. RoHS proof

2011/65/EU

EN 50581

Electronic individual zone control equipment EN 15500

UL compliance UL916

C-Tick conformity (EMC)

S/NZS 61000-6-3

eu.bac Meets the requirements for eu.bac certification

See product list at: http://www.eubaccert.org/ licences-by-criteria.asp

Type License

pplication Control

accuracy [K]

RXC20.5 20737 Fancoil 2 pipes heating / coooling 0.2 / 0.1

Heating systems (radiator) 0.3

Electric convectors 0.2

Chilled ceiling systems 0.3

RXC21.5 20705 Fancoil 2 pipes heating / coooling 0.2 / 0.1

Fancoil 2 pipes / 2 wires heating / coooling 0.2 / 0.1

Fancoil 4 pipes heating / coooling 0.2 / 0.1

Chilled ceiling systems 0.3

Environmental compatibility The product environmental declaration

CA2E3834 contains data on RoHS compliance,

materials composition, packaging, environmental

benefit, disposal

ISO 14001 (Environment)

ISO 9001 (Quality)

Dimensions See dimension diagrams

Weight Excluding packaging 0.59 kg

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Connection terminals

3804A02

123456789 13141516 1718

GND

CP–

CP+

CLA

CLB

CLA

CLB

1234

QAX...

19 19 21 25 26

Q13

Q14

AC 230 V 5(4) A

LonWorks®

Bus

Measured value input

B1 1 Measured value input with LG-Ni 1000 sensor

M 2 Measured value input ground

Signal inputs

D1 3 Signal input

GND 4 Signal ground

D2 5 Signal input

Triac outputs

Y1 6 AC 24 V, 0.5 A switching output

G 7 AC 24 V actuator supply

Y2 8 AC 24 V, 0.5 A switching output

G 9 AC 24 V actuator supply

Room unit

CP– 13 PPS2 ground

CP+ 14 PPS2 data

CLA 15 Data A

CLB 16 Data B

LONWORKS® bus (plug-in)

CLA 17 Data A

CLB 18 Data B

Power supply

N 19 Neutral conductor

L 21 Phase line AC 230 V +/- 10 %

Relay output

Q13 25 Feed for Q14

Q14 26 N/O contact AC max. 250 V, 5 (4) A

Observe the technical data for the relay output: Max. AC 250 V, 5 (4) A

Local installation regulations must be observed.

Standard RJ45 tool socket for LONWORKS® devices.

3206Z01

2345678

1 LONWORKS®, Data A (CLA)

2 LONWORKS®, Data B (CLB)

3 Unoccupied

4 Unoccupied

5 Unoccupied

6 unoccupied

7 PPS2 (CP+)

8 PPS2 (CP–)

RXC20

STOP Note!

Tool socket

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