Siemens WTT16 Series User manual

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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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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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
6
7
11
10
8
9
5
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 Rx Tx
4
2
7
3
5
6
1
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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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
A
WT…16 number (primary address) and network
number alternate
B
Number of WT…16 on the network
C
Number of consumption meters on the network
D
Remaining capacity of the WTT16’s main battery
in %
E
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)
M
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)
M
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)
M
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
C
When, from a PC, the WT…16 is accessed with
a WTZ.RM radio module, symbol “ “ will appear
High-speed
mode
For example
M
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.
S
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
23
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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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
12
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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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

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Dimensions
184
31,8
9,7
200
60
R
150
R
100
150
250
250
R
55
250
2,5
R
55
150
205
9,7
25,3
250
R
250
R
200160
2,5
55
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.
©2002 Siemens Building Technologies AG
Subject to alteration