Siemens WTT16 Series Manuale utente

CE1N2874en

14.07.2005

Building Technologies

HVAC Products

2874

Siemeca™ AMR

Network Node WTT16…

WTX16…

The WT…16… network node is used to receive and handle the data transmitted

by consumption meters of the Siemeca™ AMR system. In small plants, one net-

work node suffices as a data collector. In larger plants, or when consumption

data shall be read out from a remote location, an M-bus interface for connection

to an OZW10 M-bus central unit or a Siemeca™ gateway is required. The

WTT16… network node is battery-powered, the mains-powered WTX16… version

is available for special applications.

Use

The WT…16… network node is a component of the Siemeca™ system. It has been

designed for use in buildings to create a radio network for receiving and storing the

data transmitted by the consumption meters installed in the building. Communication

between several network nodes is via radio also so that no wiring is required. All meas-

ured values acquired by the consumption meters are continuously exchanged within

the network, which means that every network node stores the current consumption

values, the values read out at the end of the month, and the set day values of all meter-

ing devices on the network. Owing to this operating principle, all network data can be

read out at any of the nodes, or a Siemeca™ gateway for remote data transmission can

be used with any of the nodes. The field of use of the Siemeca™ AMR system is de-

scribed in data sheet N2870.

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Building Technologies Network Node WTT16…, WTX16… CE1N2874en

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Functions

•Reception and storage of the data transmitted by the Siemeca™ AMR consumption

meters

•Automatic creation of a network with up to 12 WT…16 (with a maximum of 500 con-

sumption meters)

•Passing on all relevant consumption values to all WT…16 on the network

•Communication via the Siemeca™ gateway

•Communication with the OZW10 M-bus central unit

Network node versions

The WT…16… network node is a component of the Siemeca™ system and has been

designed for exclusive use with that system.

It is available in a number of versions for different applications:

Application Battery-powered Mains-powered

Standard WTT16 WTX16

With RS-232 interface for local data readout WTT16.232 WTX16.232

Network nodes with integrated gateway are used for the remote readout of Siemeca™

AMR networks. They are described in data sheet N2878.

Combinations

All network nodes with integrated gateway can be used along with any other network

node. The maximum number of 12 network nodes in one system must not be ex-

ceeded.

The network nodes with gateway and integrated M-Bus master (WTX16.GSM and

WTX16.IP) are able to read M-Bus meters according to EN1434/3.

Technical design

The network node consists of the following subassemblies:

transceiver for

Siemeca™ network

memory for

500 meters

M-Bus

(Slave)

RS232

(optional)

backup battery

power supply:

mains supply WTX16..

battery WTT16...

Receiver and transmitter are used for re-

ceiving consumption data and forwarding

them to other network nodes of the network.

The memory stores the consumption data. It

is protected against temporary power drops

(e.g. mains power failure or replacement of

the main battery) by a backup battery. The

network can be read locally via the M-Bus

interface. The network nodes WT…16.232

have an additional RS232 interface for rea-

dout purposes.

WTT16… nodes are battery-operated, while WTX16… require a mains power supply

AC 100 V…230 V.

The network node consists of 2 major sections: The base and the housing with the

electronics. It is thus possible to mount the base prior to commissioning, enabling the

electrical installer to connect the WTX16 to the mains network. At the time of commis-

sioning, the electronics section is snapped on and the electrical connections are made.

Basic design

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Building Technologies Network Node WTT16…, WTX16… CE1N2874en

HVAC Products 14.07.2005

The housing with the electronics is identical for all types of network nodes. It contains

the network controls:

RESET

MODE

DISPLAY

1 2 3 4

1 Connector for M-bus service connection

2 Connector for enhancements

3 Screw terminal for the fixed M-bus connection

4 Connector for power supply DC 3,6 V

5 Connector for backup battery Indication of mains supply

6 Operating mode button (red)

7 Button for switching the display (blue)

8 Reset button (recessed)

9 Display

10 Connector (not for the user)

11 Firmware memory (covered up)

The wall-mounted section of the network nodes WTT16… contains only the main battery.

The wall-mounted section of the network nodes WTX16 and WTX16.232 contains the

power pack and possibly an additional RS232 interface.

GND

n.c.

RTS

CTS

1 Mains connection L and N

2 Preinstalled mains cable (no flexible power cable!)

3 Extra insulation (shrink sleeve)

4 Connector for power supply DC 3,6 V

5 Screw terminal for the fixed M-bus connection

6 Connector for M-bus service connection

7 Indication of mains supply

Electronics section

Wall-mounted section

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Building Technologies Network Node WTT16…, WTX16… CE1N2874en

HVAC Products 14.07.2005

The display of the WT…16… facilitates commissioning work and troubleshooting. In

addition to the standard display that shows the operating mode of the WTT16, there are

5 different display levels from “A“ to “E“ that can be selected by the user.

Display level

Current operating mode

WT…16 number (primary address) and network

number alternate

Number of WT…16 on the network

Number of consumption meters on the network

Remaining capacity of the WTT16’s main battery

in %

Error code (3 groups)

There is a total of 6 operating modes some of which can be selected by pressing the

button on the network node, some are selected automatically, or from a connected PC

via the ACT26 commissioning software. The selected operating mode appears on the

display:

Operating mode Display Explanation

Standard mode

This is the normal operating mode of the data

collectors: Telegrams from the metering de-

vices are received, stored and further handled

by the network

Extended

standard mode1)

The receiver is always active to ensure fast

communication. This mode is automatically

activated in the case of mains-powered opera-

tion (WTX16…). It can also be started manually

with the ACT26 service tool

Installation mo-

de2)

In installation mode, the radio network will be

configured automatically. Metering devices that

transmit installation telegrams in this operating

mode are registered on the network

Extended instal-

lation mode2)

Same as installation mode, except that in addi-

tion to installation telegrams, data telegrams

are accepted also. This mode is practical when

the network is installed at a later stage

Search mode

Metering devices that have been lost are syn-

chronized again (this mode is activated

automatically)

Extended search

mode2)

Same as resynchronization mode. It must be

started manually with the ACT26 service tool

and searches for lost or manually entered me-

tering devices

1) In battery powered network nodes this mode is terminated automatically after eight hours.

2) This mode is terminated automatically after eight hours.

Display

Operating modes

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State of the

system Display Explanation

Remote access

When, from a PC, the WT…16 is accessed with

a WTZ.RM radio module, symbol “ “ will appear

High-speed

mode

For example

When all WTT… have their receivers continu-

ously on so that all new data can immediately

be exchanged on the network, 2 dots will ap-

pear in the upper half of the display

Engineering notes

For detailed engineering instructions, refer to the Siemeca™ Engineering manual

CE1J2870.

Commissioning

For mains-powered WTX16…. network nodes, the mains connections are to be made

first at the selected mounting positions (typically on every second floor, mounting height

≥2 m), if required.

N L

R1 ... Rn

M1 M2

S Switch

L, N AC 230 V mains power supply

M1, M2 M-Bus output

R1…Rn optional interface(s)

CAUTION: connect the

mains cable to the power

supply unit only!!

1 Mains connection L and N

2 Preinstalled mains cable (no flexible power cable!)

3 Extra insulation (shrink sleeve)

Connect the AC 230 V power supply line to the power pack of the

WTX16… in the following order: Remove the upper housing section of

the WTX16… from the base. For that purpose, remove the 2 cable

connections (power supply (4) and M-Bus (6)) between gateway and

base. Then, use a suitable tool (screwdriver or similar) to slightly open

one of the two lateral fixing levers so that upper housing section and

base can be separated.

Then, the top section of the WT…16 is to be fitted using 2 dowels and

screws (spacing of dowels 184 mm with the WTX16…).

Connection of the AC 230 V power line to the power pack of the WTX16… is to be

made as follows:

A 2-core mains cable (L and N) is already preinstalled at the mounting site. The power

pack must be connected by qualified staff. The cores must be sheathed with the en-

Wiring diagram

Mains connection

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Building Technologies Network Node WTT16…, WTX16… CE1N2874en

HVAC Products 14.07.2005

closed insulating sleeves to ensure compliance with safety class II. Then, the live (L)

and neutral (N) conductors must be connected to terminal “IN” of the power pack.

Mains voltage must be in the range from AC 100 to 240 V (50 / 60 Hz). There is no

protective earth (PE) connection. Then, cable strain relief must be provided by fitting

cable ties.

Once the top section of the WT…16 is fitted, the housing with the electronics can be

snapped on. Then, the power supply connector can be plugged into the electronics

section and the WTT16 switched to installation mode by pressing the MODE button

(red) for a few seconds. Then, additional network nodes or consumption meters of the

Siemeca™ AMR system can automatically configure themselves to form a network.

Ensure that the local regulations for radio transmission installations and electrical instal-

lations are complied with.

Safety notes

After opening the housing, certain parts of the device / system that become accessible

carry dangerous voltage.

Only qualified staff may interfere with such devices / systems.·

•To ensure correct and safe operation, the product must be adequately shipped,

stored, installed, operated and maintained

•Staff dealing with the product must be familiar with all potential hazards and mainte-

nance measures in accordance with the instructions given in this document.

Non-observance of these warning notes can lead to personal injury or damage to

property!

Ensure that the local regulations for radio transmission installations and electrical instal-

lations are complied with.

Pursuant to the "Verordnung über Allgemeine Bedingungen für die Elektrizitätsver-

sorgung von Tarifkunden (AVBEltV)" of the Ministry of Economics, electrical installa-

tions behind the house’s fused connection may only be erected, extended, changed

and maintained by electrical installers that are registered with an electric utility. They

must ensure that the general technical regulations and legal safety regulations are

complied with.

Commissioning

RESET

MODE

DISPLAY

For safety reasons, the WTT16… is

supplied without having the main battery

connected.

1 Connector for power supply

2 Backup battery

After installation of the network node, connect the battery plug to the relevant connector

(1). The display of the network node will show bAtt . Press the blue DISPLAY button

once to start the life expectancy calculation for the new main battery.

Caution: The main battery can be removed from the network node during operation and

the plug can be connected again. In that case, the DISPLAY button may not be pressed

In Germany:

Calculating the battery’s

life expectancy

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Building Technologies Network Node WTT16…, WTX16… CE1N2874en

HVAC Products 14.07.2005

as a confirmation. The result would be an erroneous display when showing the remain-

ing capacity.

First, remove the discharged main battery and insert the new one. Press the blue

DISPLAY button once to start the life expectancy calculation for the new main battery.

The backup battery MUST NOT be removed simultaneously. A fatal loss of data would

happen.

After storing the main battery for longer periods, especially at temperatures higher than

30 °C, the battery might passivate. Under these circumstances it will not be able to

deliver sufficient energy to the network node. If the network node detects a passivated

battery a de-passivation cycle is triggered. This is indicated by a flashing front LED.

The procedure might take a few minutes. After de-passivation the network node will

start up in IdLE mode. Low temperatures at the battery may cause a similar behavior

in other modes too.

The main battery used by the WTT16… requires careful treatment:

•Do not short-circuit or damage the battery

•Do not expose the battery to excessive heat

•Return exhausted batteries to the supplier

•Read the enclosed safety instructions carefully

M-Bus connection

Any network node can be connected to the M-Bus temporarily (service connector) or

continuously (screw terminal for the fixed M-bus connection). A plug for the screw ter-

minal is included with every network node.

RESET

MODE

Screw terminal for the fixed

M-Bus connection

max. 5 unit loads

M-Bus service connection

Technical data

conformity to EMC directives

Safety class IP32

Safety class 2

Electromagnetic compatibility immunity: EN 55 024/EN 301 489

emissions: EN 55 022/EN 300 220-1

Operating voltage WTT16… DC 3.6 V

Lifetime of main battery > 5 years

Operating voltage WTX16… AC 100…240 V, 50/60Hz

Rated frequency 868.3 MHz

Transmitter power < 14 dBm

Frequency of transmission <1%

Perm. ambient temperature

Transport and storage

Operation

−20…+60 °C (< 30°C recommended)

0…55 °C

Weight 0.3 kg

Battery replacement

De-passivation

Safety notes on

lithium batteries

8/8

Building Technologies Network Node WTT16…, WTX16… CE1N2874en

HVAC Products 14.07.2005

Dimensions

184

31,8

9,7

200

150

100

150

250

2,5

150

205

9,7

25,3

250

200160

2,5

Dimensions in mm

WTX16…

WTT16…

The information provided in this Data Sheet only gives general descriptions and general technical features

which, in the case of specific applications, may not necessarily apply, or which may change due to further

development of the product. Technical features are binding only when expressly agreed upon at the time a

contract is concluded.

Subject to alteration

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