Viessmann 6840 Manual page 3

1.2 Using the product for its correct
purpose
This product is intended:
- For installation in model train layouts and dioramas.
- For connection to an authorized model train transformer
(e. g. item 5200).
- For operation in dry rooms only.
Using the product for any other purpose is not approved
and is considered inappropriate. The manufacturer is
not responsible for any damage resulting from the im-
proper use of this product.
1.3 Checking the package contents
Check the contents of the package for completeness:
- Switching contact with connection cable
- 2 underlay pieces
- Screw
- Manual
2. Introduction
The switching contact item 6840 from Viessmann is
able to trigger switches by the running train. It is us-
able in combination with two- and three-rail tracks and
can be mounted directly on the tracks. The contact is
activated by a vehicle magnet (e. g. Viessmann item
6841) without being touched. It can be mounted under
nearly all H0 track vehicles and makes it possible to
switch turnouts and signals or to give a feedback to a
digital system.
3. Mounting
The switching contact can be screwed onto the tracks
through the hole of the fastening bar (fig. 1). For tracks
without ballast, the enclosed underlay pieces have
to be used (fig. 2). The smaller one is suitable for
Fleischmann tracks and the bigger one for tracks with-
out ballast from all other manufacturers. Please note
that the mounting in a curve is only permitted for radii
from 358 mm upwards.
4. Connection
4.1 How to connect the switching contacts
The following pictures show several possibilities for
using the switching contacts. Please note, that only one
drive can be connected to each contact unit. Otherwise
there can be an overload, so that the contacts can be
destroyed.
One wire of the switching contact has to be connected
to one pole of the alternating current exit of a model
train transformer. The other wire has to be connected
to one of the blue wires of the magnetic article.
4.2 Controlling of a semaphore
Connect the signal as shown in fig. 3.
5. Operation with digital systems
If you operate with switching contacts it is important,
that the vehicle does not stop directly above a contact.
By a permanent contact the electromagnetic spools
could burn.
The distance between the switching contact and the
magnet has to be between two and five millimeters.
This is neccesary to guarantee a sufficient magnetic
power and to guarantee, that the tracks do not get
magnetic. If the magnetic power is not strong enough,
two magnets can be mounted in a row.
6. Technical data
Max. switching voltage:
Max. contact load:
3
24 V AC~ / DC=
2 A