Instructions

Remarks: The decoder addresses for magnet accessories
are combined in groups of four. The address 1 to 4 build
the first group. The address 5 to 8 build the second group
etc. Each M-DEC decoder can be assigned to any of these
groups. Which turnout of a group will be activated for the
addressing does not matter.
• If the decoder has recognized the assignment correctly the
connected turnout will move a little faster. Afterwards the
movement slows down to the initial 1,5 seconds again.
In case the decoder will not recognize the address it could
be that the two digital information connections (clamp 2) are
wrong connected. For testing this, switch the power supply
off, exchange the connection on KL2 and start addressing
again.
• Leave the programming mode by depressing the
programming key S1 again. The decoder address is now
permanently stored but it can be changed at any time by
repeating the programming as described above.
• If you depress the first key of the programmed group of keys
or you send a switch signal for this turnout from a PC the
addressed turnout drive should move into the called
direction until end stop.
Please attend to the following:
• All 4 decoder outputs can supply a motor current of 1
Ampere. As the moving time of the drives is only some
seconds the tracking time of the decoder output is adjusted
to 10 seconds. This indicates that the respective output will
be switched off from power 10 second after the end of the
switch command. This assures that a defect end switch
will not destroy a drive with continuous current.
• The motors of turnout drives can create considerable
electromagnetic interference. Normally the decoder M-
DEC will not be influenced by this interference. In case the
decoder will be influenced please check the turnout motor
installation cables. Those cables should not wrap or cross
the decoder closely. Install the cables that way that they go
straight away from the clamps of the decoder. If limited
space requires a bad installation layout and the function of
the decoder will be disturbed please push about 5 ferrous
pearls onto each motor cable.
These ferrous pearls are available at electronic shops or at
LDT with the order code `FP`.
Another possibility is to solder an interference capacitor
(between 1nF and 10nF) across each motor. Fulgurex
drives need this capacitor in any case.
Sample connections:
Spannungsversorgung
12 ... 18V~
15 ... 24V=
3
4
1
2
Fulgurex
Pilz/Tillig
M-DEC
Digitalinformationen
(von Steuereinheit oder Booster)
Hoffmann
Conrad
The above draft provides an example how to connect the
different drives directly to the M-DEC without any additional
circuitry.
Further application and circuit examples can be found in the
Internet on our Web-Site (www.ldt-infocenter.com) at the
section downloads/sample connections.
Accessory:
For the assembly of the M-DEC below your layout base plate
we offer an assembly set under the order code MON-SET. For
the assembled kits and the finished modules we offer from
version 2.0 a suitable case under the order code LDT-01.
Trouble shooting:
What to do if something is not working as described above?
If you have purchased the decoder as a kit please check
carefully all parts and soldered joints.
Here some possible functional errors and possible solutions:
1. During programming of the decoder addresses the motor
moves within 1.5 seconds, but does not confirm the
programming with faster movement by pressing any key.
• Change cable connections at KL2.
• Interfered digital information at KL2 respectively lost of
voltage at the tracks or at the installation!
Connect the decoder directly with cables to the digital
control unit or to the booster instead to the tracks. Increase
the cable diameter for long distances.
• Eventually the clamps have been tightened to strong and
therefore the clamps got loose at the soldering to the pc
board. Check the soldering connection of the clamps at
the lower side of the pc-board and re-solder them if
required.
• For kits: Is IC5 correct inserted into the socket? Has
resistor R6 actually 220 kOhm or has this resistor been
mixed-up with the 18kOhm resistor R5?
2. The programming of the decoder address functions as
described, nevertheless the connected turnouts will not be
activated.
• Interfered digital information on KL2 respectively larger
lost of voltage at the tracks or the installation result to
unsafe data transfer! Connect the decoder directly to the
command station or the booster. Increase the cable
diameter of long distance connection cables.
• For the kit: Is IC4 correct inserted into the socket?
3. The drive moves not until the end switch but stops after a
short movement. The decoder shows not any reaction after
some commands.
• This can happen especially by Fulgurex-drives without
interference capacitor. Solving: solder an interference
capacitor (1nF) directly to the motor connection clamps.
Further Products from our Digital-Professional-
Series:
S-DEC-4
4-fold turnout decoder for four magnet accessories with free
programmable decoder addresses and possible separate power
supply.
SA-DEC-4
4-fold switch decoder with 4 bistable relays for switching up
to 4A each. With free programmable decoder addresses.
LS-DEC
Lightsignal-Decoder for up to four LED-equipped signals.
Signal aspects will be switched as real by up- and down
dimming and will be switched directly via decoder addresses.
All components can be purchased as easy to assemble
complete kits, as finished modules or as ready finished
modules in a case.
Made in Europe by
Littfinski DatenTechnik (LDT)
Kleiner Ring 9
D-25492 Heist/Germany
Phone: [phone] / 977 381
Fax: [phone] / 977 382
Internet: http://www.ldt-infocenter.com
Subject to technical changes and errors.  06/2014 by LDT
Arnold, Märklin, Lenz, Digitrax, Roco and Zimo are registered trade marks.