Viessmann 5242 Manual page 11

avoid overheating. Otherwise the decoder may be
thermally overloaded.
Under no circumstances should components
of the decoder touch any metal parts of the
chassis or the locomotive body. Resulting
short circuits will destroy the decoder!
2.2. Installing the Decoder 5242
(Decoder with wires)
Before you start, completely insulate the motor
and its terminals against the chassis of the loco-
motive and the current pick-ups (wheel pick-ups).
Remember which motor terminal was connected
with the right or left wheel pick-up.
1) Before you start, you have to discharge any
electrostatic charge by touching a water tap
(or radiator) to avoid damage through an elec-
trostatic discharge. Clothes made of cotton are
best suited for working with decoders.
2) Solder the wires according to fig. 1 onto or
next to the individual contacts of the NEM
socket or insert the soldered wire ends into the
socket. Disregard the following paragraphs 3
to 5. They are only valid for locomotives with-
out interface.
3) If the locomotive has no NEM interface socket,
connect the red wire to the right wheel pick-up (as
by Märklin locomotives with the wiper), the black
wire to the left wheel pick-up of the locomotive.
4) If you locomotive has got an AC motor two 1
A diodes (Viessmann art.no. 6834, 10 pieces)
are required (see fig. 2 at page 18). Load
control has to be switched off regardless!
You have to select the low tact frequency
for motor control (see CV9 in the following
chapter).
Instead of this you can convert the AC motor
to DC by replacing the field coil with a HAMO
permanent magnet. The field coil and the
diodes are not necessary any more. The load
control can be used again.
5) To connect DC motors solder the orange wire
to the motor terminal, which was connected to
the right wheel pick-up before installation. Sol-
der the grey wire to the motor terminal, which
was connected to the left wheel pick-up. The
RFI suppression components, which were
connected to the motor before installation,
should remain in the circuit in front of the
motor. Otherwise disturbances generated by
the motor could impair the functionality of the
decoder.
6) The decoder don't have a positive supply for
the function outputs (blue wire used by H0
decoders, see also point 7). The bulb has to
be connected with the wheel pick-ups accord-
ing to either of the following methods:
◆ If the light sockets of the locomotive are
insulated against chassis (potential-free),
wire them as shown in fig. 2. The front bulb
has to be connected with the white wire.
The other pole must be connected with the
red wire, which is connected to the corre-
sponding wheel pick-up (the back bulb with
the black wire and the corresponding wheel
pick-up). This connection works with an
analogue layout.
◆ In locomotives, where one pole of the light
socket is electrically connected with the
chassis, wire the outputs as shown in fig. 3.
Please note, that with this wiring methode
the light and function outputs don't work in
analogue mode depending on the polarity
of the track voltage. This wiring method
may result in variations of brightness if
used with command stations which transmit
signals in Märklin-/Motorola format besides
the DCC-signals.
Function outputs A (white) and B (yellow) may
be operated in two different ways. The adjust-
ment is done with CV56:
◆ When using the outputs for directional
headlights connect the white wire with the
forward bulb (in direction of travel) and the
yellow wire with the rear bulb. Connect the
other pole of the bulbs with the blue wire.
When using LEDs, connect the anodes to
the blue wire and the cathodes via a resis-
tor (approx. 1 kΩ / 0.125 W) to the yellow
respectively white wire.
◆ When using the outputs for non-directional
headlights and an auxiliary function, con-
nect the white wire with the light and the
yellow wire with the auxiliary function. Con-
nect the other pole of the head lights and
of the auxiliary function with the locomotive
chassis or the wheel pick-ups.
7) In order to operate auxiliary loads (e.g. steam
generator) at full output, a positive supply
must be generated for the light outputs (this
serves the same purpose as the blue wire
in H0 decoders) by means of two diodes as
shown in fig. 5 at page 19.
8) Afterwards check the entire wiring, the de-
coder and the motor connections for possible
short circuits.
9) Are there any metal parts close to the decoder,
cover them with insulation tape. Don't wrap the
decoder in insulation tape to avoid overheat-
ing. Fasten the decoder with a double sided
adhesive tape inside the locomotive.
GB
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