7/8
www.qundis.com Network
Node
WTT16 V22
CE1N2874en
09.09.2009
Pursuant to the "Verordnung über Allgemeine Bedingungen für die Elektrizitätsversorgung
von Tarifkunden (AVBEltV)" of the Ministry of Economics, electrical installations behind the
house’s fused connection may only be erected, extended, changed and maintained by elec-
trical installers that are registered with an electric utility. They must ensure that the general
technical regulations and legal safety regulations are complied with.
Commissioning the WTT..
RESET
MODE
DISPLAY
1
2
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 as a
confirmation. The result would be an erroneous display when showing the remaining capac-
ity.
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 depassivation the network node will start up automatically in IdLE
mode. Long press of button MODE activates the installation mode of network node. Low
temperatures at the battery may cause a similar behaviour 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 con-
tinuously (screw terminal for the fixed M-bus connection). A plug for the screw terminal is
included with every network node.
RESET
MODE
Screw terminal for the fixed
M-Bus connection
max. 5 unit loads
M-Bus service connection
In Germany:
Calculating the battery’s
life expectancy
Battery replacement
Depassivation
Safety notes on
lithium batteries
