Instruction Manual
ExTox Control Units Series ET-8D and ET-4D2
Page 35 of 39
8
Installation
8.1
Mechanical Installation
The control unit should be installed at an easily accessible place to enable the reading out of
messages at every time and to ensure an easy maintenance.
Please note the indicated operation temperature ( DB). The control unit should be installed
protected against weather conditions, such as for example driving rain, and bigger climatic
fluctuations. If necessary a suitable protection has to be provided.
The dimensions for assembly and further installation dimensions to be taken from the Tech-
nical Data Sheet ( DB).
The type in wall mounted housing and for installation in control panels or 19''-Rack are fix
screwed up. The type for DIN-Rail installation disposes of four fixtures with which the hous-
ing is snapped on the DIN-Rail. By pulling the handles standing out of the backside of the
device the connection can easily be untied and the device can be taken off.
The control units may not be installed in hazardous areas.
8.2
Electrical Installation
The electrical installation may only be done by electro specialists according to the installa-
tion regulations on the subject. There are especially regulations for the Installation of In-
formation Engineering IEC 60364 (in Germany VDE 0800) and for lightning protection ac-
cording to EN 62305 (in Germany DIN V VDE V 0185). The power supply of the control unit
has to meet the requirements of an arrester of Class
C or of Type 2. Please note that there
might be special requirements in case control unit and transmitters are installed in separat-
ed rooms.
The control units are designed for industrial application. Warning: The control units are
Class A devices. It may cause radio interferences in living quarters. In this case the user
may demand performances of suitable measures.
When running the cable you should pay attention to the fact that the cables for the gas sen-
sors should better be run separately and protected against mechanical damages.
On the type in wall mounted housing and for DIN-Rail installation the housing has to be
opened. To do this you have to remove the blind plates on the left and right side of the
front and unscrew the four screws. The cover can now be opened and tucked up. The con-
nections are in the bottom part of the housing. The big cable gland M20x1.5 serves for the
power supply cable.
On the types for installation in control panel or 19''-Rack the PCB including clamps is
mounted in a separate part of the housing, which has to be installed at the adequate place
in the enclosure. Both components are electrically linked by means of three included ribbon
cables. In case the standard length ( DB) does not fit, please do not hesitate to contact
ExTox. As an option the different types can also be supplied in combined "Sandwich"-
design. In this case the clamps are freely accessible on the backside of the housing.
The control unit starts operation automatically with connection to the power supply.
You could find the connection scheme for input and output in the Technical Data Sheets
( DB) and also marked on the PCB. Connection is done via plug clamps. Remove the plug
before connecting the cable to avoid mechanical damage. After the assembly is done you
could connect the plug again.
The connection PCB shows a spatial separation of the transmitter inputs and the relay out-
puts. The overlapping of lines between these two areas within the housing and on the PCB
should be avoided. It should especially be ensured that correct isolation is kept in case ca-
bles of different voltage get in contact. We recommend not removing the protection isola-
tion directly after the cable gland but only close to the corresponding clamp.
ET-8D: grounding can be done via the clamp block SLD of the transmitter inputs.
ET-4D2: normally the shield of the transmitter cable should not be passed into the control
unit ET-4D2. PE-lines can be connected to the clamp SHLD of the corresponding channel. In
