Introduction; Installing The Decoder - Viessmann 5242 Manual

NMRA-DCC/Motorola Locomotive
Decoder with Load Control

1. Introduction

The decoders 5242 and 5243 are compatible with
the NMRA-DCC-standard and can be used with
command stations by various suppliers such as
Lenz, Roco, Uhlenbrock (Intellibox), Arnold, Digi-
trax, Fleischmann (TwinCenter), Zimo (MX1/N),
etc. . Furthermore the decoders can be used with
the Märklin / Motorola format.
Features
✔ Usable with DC- and coreless motors (e.g.
from Faulhaber)
✔ short and extended (4-digit) addresses and 14,
28 and 128 speed steps (DCC)
✔ 255 addresses and 14 or 28 speed steps when
using the Motorola format
✔ parametrical load control
✔ high frequency (approx. 16 kHz) and lower
GB
frequency motor control
✔ switchable shunting speed, adjustable low-,
medium- and maximum speed
✔ programming on the mains
✔ function outputs with programmable light ef-
fects and dim function
Technical Data
◆ max. operating voltage
(track voltage):
◆ maximum motor current: 0.7 A
◆ maximum current per
light output:
◆ total load (analogue-/
digital operation):
◆ operating temperature: 0 bis 60°C
◆ dimensions 5242:
◆ dimensions 5243
incl. 6-pole plug:
The motor and light outputs of the decoder are
protected against excess current. However, dam-
age may be caused by short circuit between cur-
rent pick-up and motor, short circuit between mo-
tor output and locomotive chassis or overloading
the decoder. The decoder is only allowed to be put
in model railways.
This decoder is not suitable for operation
with conventional AC supply and the volt-
age pulse for change of direction! The high
voltage of this pulse will cause the destruc-
tion of the decoder.

2. Installing the Decoder

Preparation
Only locomotives, which run smoothly in analogue
mode, should be equipped with a digital decoder. A
secure and uninterrupted current pickup is impor-
10
24 V
0.15 A
0.7 A
3
ap. 11.4 x 8.8 x 3.3 mm
3
ap. 13.4 x 8.8 x 3.3 mm
tant especially in digital mode. Change worn coal
brushes and defect lights and clean wheel pick-
ups. The decoder should be installed inside the
locomotive in such a way as to avoid overheating.
Tools: For installing the decoder please use a
soldering iron with 30 watts max. (if possible with
temperature control), electronic solder (no solder-
ing paste) and side cutters (to shorten the leads
of the decoder 5242) and small screw drivers. You
also need insulation tape (to cover any metal parts
of the locomotive) and double sided tape (such as
included in Viessmann locomotive decoder instal-
lation set 6819) to fasten the decoder.
Before installing the decoder you have to com-
pletely insulate the motor, which means there
should not be any electrical connection between
motor and wheel pick-ups. Don't forget which mo-
tor terminals were connected with the right or left
wheel pick-up.
Advice for older Fleischmann locomotives:
Often in these locomotives the motor shield is part
of the motor's power supply and therefore con-
nected with one of the wheel pick-ups. To insulate
the motor you have to cut off this connection or
replace the motor shield.
Maximum Current Load Capacity
The decoders 5242 and 5243 supply a motor cur-
rent of 0.7 A. Values regarding current draw of the
locomotives generally refer to a voltage of 12 or
14 V. Is the digital voltage of your command sta-
tion higher (e.g. Märklin digital, Roco "Lokmaus 1
and 2". Lenz "Compact", LGB, Intellibox), the cur-
rent draw rises and could potentially exceed the
permitted value of 0.7 A. For operating N gauge
we recommend a track voltage of approx. 14 V.
The total current load capacity of the decoder in
digital mode is 0.7 A. If the motor draws e.g. 0.6 A,
then the total current available for all the light and
function outputs is 0.1 A. Every function output of
the decoder have got a load capacity of 0.15 A each.
Please observe the maximum load capacity
of the decoder and each individual output.
the decoder may be destroyed through
overload!
2.1. Installing the Decoder 5243
(Decoder with Interface as per NEM 651)
Once you have opened the locomotive remove the
bridge plate from the interface socket on the circuit
board and insert the plug of the decoder instead.
Please make sure that the pin 1 of the decoder
(see fig. 1 at page 18) and the pin 1-mark of the
circuit board (often a "✶" or "+") match.
Insulate all metal parts close to the decoder but
don't wrap the decoder with insulation tape to