Meltem M-WRG-KNX-GW Montageanleitung

VENTILATION & HEAT RECOVERY

INSTALLATION INSTRUCTIONS AND

USER GUIDE

Part no. 744018EN, Week 51/2022 EN

Modbus-KNX gateway

M-WRG-KNX-GW

Fig. 1: Modbus-KNX gateway

1 Introduction

1.1 Notes on these instructions

These instructions contain important information that

should be followed when installing and using the

Modbus-KNX gateway.

►Read all the instructions carefully to avoid possible risks and

mistakes.

►These instructions are part of the product. Keep the instructions

in a safe place for future reference.

NOTICE

►When operating the ventilation unit, also follow the operating

instructions that were supplied with your unit.

1.2 Description

The Modbus-KNX gateway is used to control a ventilation unit of

the operation via Modbus type via KNX bus. It can only be used

in conjunction with an M-WRG-II P/E-M (-F, -FC) or M-WRG-S M

(-F, -FC) unit. The gateway is tted inside the ventilation unit.

The gateway is commissioned using the Engineering Tool Soft-

ware (ETS) in combination with the associated application program.

All functions are parameterised and programmed via the ETS.

NOTICE

— One gateway is needed for each ventilation unit.

— A 24 V auxiliary voltage and a KNX connection are to be

provided by the customer.

1.3 Target group

These installation and operating instructions are aimed at two target

groups:

The activities described in chapter „4 Installation in the M-WRG-II

ventilation unit“, chapter „5 Installation in the M-WRG ventilation

unit“ and chapter „6 Wiring“ must only be carried out by specialised

personnel with the following qualications:

— Training in the installation and commissioning of electrical

devices

— Training in electrical hazards and the local safety requirements

— Knowledge of the relevant standards and directives

— Knowledge and observance of this document and all the safety

instructions

The other chapters of this document are intended for users of the

Modbus-KNX gateway. It assumes prior knowledge of the KNX bus

and the Modbus protocol.

1.4 EU declaration of conformity

The Modbus-KNX gateway described below

Type: M-WRG-KNX-GW

Part number: 5048

manufactured by

Meltem Wärmerückgewinnung GmbH & Co. KG

Am Hartholz 4

82239 Alling

conforms to the regulations and standards listed in the EU Declara-

tion of Conformity.

1.5 Technical data

Product characteristics

Dimensions (W x H x D) 50 mm x 50 mm x 20 mm

Weight approx. 310 g

Housing material Makrolon 6265X V-0 (PC)

Product database contained in the ETS

Ambient conditions

Ambient temperature during operation -20 °C to 55 °C

Ambient temperature for storage and

shipping

-20 °C to 85 °C

IP code IP20

Electrical connection

Bus coupler integrated

Auxiliary voltage for Modbus units 12 V DC

Auxiliary voltage current consumption max. 100 mA

KNX operating voltage (bus voltage) 21 V DC to 32 V DC

KNX power consumption approx. 240 mW at

24 V DC

1.6 Environmentally-friendly disposal

The components of the Modbus-KNX gateway must not be

disposed of in the non-recyclable waste bin.

►In Germany, metal and plastic components should be disposed

of at the local recycling centre. The national regulations in other

EU states should also be followed.

►In Germany, electrical components should be disposed of in

accordance with the Electrical and Electronic Equipment Act

(ElektroG). In other EU states, the national implementation of the

Waste Electrical and Electronic Equipment Directive 2012/19/EU

(WEEE) should be followed.

►The regulations and statutory requirements in your own country

concerning disposal should also be followed.

1.7 Explanation of the symbols used

►This symbol indicates an action to be taken.

— This symbol indicates a list.

2 Safety

The Modbus-KNX gateway is approved only for use in dry interior

areas and must be protected against humidity and moisture to

prevent short-circuits.

2.1 Hazard classication

DANGER

The signal word designates a hazard with a high degree of risk

which, if it is not avoided, will result in death or severe injury.

WARNING

The signal word designates a hazard with a medium degree of

risk which, if it is not avoided, will result in death or severe injury.

CAUTION

The signal word designates a hazard with a low degree of risk

which, if it is not avoided, could result in minor or moderate injury.

NOTICE

A note as used in this manual contains important information

about the product or about a part of the manual to which particular

attention should be paid.

2.2 Intended use

The Modbus-KNX gateway must only be used to control Modbus

units from the M-WRG-II and M-WRG series. Any di󰀨erent or more

extensive usage will be regarded as contrary to the intended use.

The intended use also includes compliance with all the notes in

these instructions.

For any use contrary to the intended use, Meltem Wärmerück-

gewinnung GmbH & Co. KG shall accept no liability for any damage

that may occur and o󰀨ers no warranty that the components will work

perfectly and correctly.

3 Items supplied

— Modbus-KNX gateway M-WRG-KNX-GW

— 4x terminal block (red/black/yellow/white)

— 5-pole terminal (green) with connecting wires

— Velcro strip and network connection cover with cable lead-

through (only when ordering for a M-WRG-Modbus unit)

4 Installation in the M-WRG-II ventilation

unit

4.1 Remove the cover from the ventilation unit

►Using both thumbs, press the two latches on the bottom of the

ventilation unit. The unit cover will come away.

4.2 Remove the electronics compartment cover

DANGER

Potentially fatal voltages in the vicinity of the

connection board

— The electrical installation work must only be carried out by a

qualied electrician.

— The VDE regulations or any special safety regulations appli-

cable in your country apply to the electrical installation work.

►Before starting installation or maintenance work, disconnect

the mains cable for powering the ventilation unit on all poles

from the mains supply.

► Observe the ve safety rules (DIN VDE 0105-100,

EN 50110-1) for working on electrical systems:

— Disconnect from mains (all-pole disconnection of a system

from live parts)

— Secure against reconnection

— Check that the system is voltage-free

— Earth and short-circuit

— Cover or block o󰀨 access to adjacent live parts

Fig. 2: Remove the electronics compartment cover

►Use the screwdriver to loosen the Torx screw (item 1 in Fig. 2)

on the electronics compartment cover (item 2 in Fig. 2).

►Remove the electronics compartment cover to access the

connection board (item 3 in Fig. 2).

4.3 Wire the gateway

►Wire the gateway to the connection board in the ventilation unit

as shown in the wiring diagram (see Fig. 4).

►Wire the gateway to the to the KNX system as shown in the

wiring diagram (see Fig. 5).

4.4 Final tasks

►Position the gateway inside the ventilation unit in the vicinity of

the connection board (item 3 in Fig. 2).

►Secure the electronics compartment cover (item 2 in Fig. 2).

►Attach the cover to the ventilation unit.

5 Installation in the M-WRG ventilation unit

►Using both thumbs, press the two latches on the bottom of the

ventilation unit. The unit cover will come away.

5.1 Replace the network connection cover

Fig. 3: Replace the network connection cover

►Replace the existing network connection cover with the version

with the cable lead-through (item 1 in Fig. 3, supplied as

standard).

5.2 Wire the gateway

►Wire the gateway to the connection board in the ventilation unit

as shown in the wiring diagram (see Fig. 4).

►Wire the gateway to the to the KNX system as shown in the

wiring diagram (see Fig. 5).

5.3 Final tasks

►Secure the gateway (item 2 in Fig. 3) to the network connection

cover (item 1 in Fig. 3) using the Velcro strip provided.

►Attach the cover to the ventilation unit.

6 Wiring

6.1 Wiring diagram: gateway – connection board in the

ventilation unit

blue

white

red

Fig. 4: Wiring diagram: gateway – connection board

6.2 Wiring diagram: gateway – KNX system

The gateway is connected to an existing KNX system using the KNX

terminal blocks (red/black) provided. An additional 24 V DC power

supply is also required on site (connected via yellow/white terminal

blocks).

The programming button (item 1 in Fig. 5) is on the back of the

gateway.

NOTICE

Note the following when inserting the terminal blocks:

— Connect up the terminal blocks in pairs: tab of the white block

in the groove of the yellow block, tab of the black block in the

groove of the red block.

— The 4-way connections on the terminal blocks point upwards.

yellow

white

red

black

21 V DC to 32 V DC 0 V DC KNX+ KNX-

Fig. 5: Wiring diagram: gateway – KNX system

7 Data points

Communication

object

Read/

write

Function/description Unit

1 W Operation

2 R Error message

3 R Frost protection

4 R Exhaust air temperature °C

5 R Outdoor air temperature °C

6 R Extract air temperature °C

7 R Supply air temperature °C

8 R Humidity, extract air %

9 R Humidity, supply air %

10 R CO2, extract air (deactivated by default) ppm

11 R VOC, supply air (deactivated by default) ppm

12 R Ventilation level for extract air m3/h

13 R Ventilation level for supply air m3/h

14 R Filter change

15 R Time until lter change Days

16 R Unit operating hours h

17 R Motor operating hours h

Min. Max. Step Default

18 R/W Rel. humidity threshold value 40 80 1 60 %

19 R/W Min. ventilation level, humidity control 0 100 1/10* 10 m3/h

20 R/W Max. ventilation level, humidity control 10 100 1/10* 60 m3/h

21 R/W CO2starting point 500 1200 1 800/600* ppm

22 R/W Min. ventilation level, CO2control 0 100 1/10* 10 m3/h

23 R/W Max. ventilation level, CO2control 10 100 1/10* 60 m3/h

24 R/W Ventilation level for external control input 10 100 1/10* 60 m3/h

25 R/W Switch-on delay for ext. control input 0 240 1 1 min

26 R/W Run-on time for ext. control input 0 240 1 15 min

27 W Operation unbalanced (extract air motor)

* Value applies to M-WRG

8 Sensors in the di󰀨erent ventilation unit types

Ventilation unit type

Sensor type

M-WRG-II P-M /

M-WRG-II E-M

M-WRG-II P-M-F /

M-WRG-II E-M-F

M-WRG-II P-M-FC /

M-WRG-II E-M-FC

with option

M-WRG-II O/VOC-AUL

M-WRG-S M M-WRG-S M-F M-WRG-S M-FC –

Exhaust air temperature X X X X

Outdoor air temperature X X X

Extract air temperature X X X

Supply air temperature X X X

Rel. humidity, extract air X X X

Rel. humidity, supply air X X X

CO2, extract air X X

VOC, supply air X

9 Conguration

The KNX gateway M-WRG-KNX-GW is congured via the ETS.

The associated application program can be obtained from the ETS

catalogue.

The gateway is supplied unprogrammed. All functions are set and

programmed via the ETS.

The gateway is congured with the following settings at the factory:

Fig. 6: Factory settings for the KNX gateway

10 Read communication objects

The channels of the gateway are predened with the possible data

points. Communication objects which are read only can be linked

directly to a group address and displayed.

11 Write communication objects

Settings can be changed on the unit using communication objects

17-25. To do this, the value for the communication object is changed

accordingly.

Fig. 7: Communication objects

12 Ventilation levels setting

Use the following table for communication objects 0 and 26 in order

to change the ventilation level (VL) of the unit:

Communication object 0

Value Mode

0 OFF OFF

1 - 99 Volume ow rate VL %

SUP / ETA

100 -

200*

Supply air volume

unbalanced

VL % SUP Only in conjunction with

communication object 26

202 Automatic mode SUP / ETA

203 Humidity mode SUP / ETA

204 CO2mode SUP / ETA

205

Intensive ventilation

SUP / ETA

Communication object 26

Value Mode

100 -

200*

Extract air volume

unbalanced

VL % ETA Only in conjunction with

communication object 0,

value 100-200

* Value corresponds to m3/h minus 100 (example: 130 = 30 m3/h)

13 Typical application

Fig. 8: Typical application

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