Description Of Confi Guration Variables - Viessmann 5242 Manual

the speed control knob to the far left. The lights
will flash repeatedly. Now you can enter the
appropriate value of the confirmation register.
Should you want to reduce the maximum speed
of the locomotive enter for instance: 48. This entry
also has to be confirmed by turning the knob to
the far left. Now this entry is stored in the memory
of the decoder. The lights come on for about three
seconds. Then the decoder is ready for the next
entry, which is indicated by the blinking lights.
To exit the programming mode enter number 80 or
press the "Stop" key of the command station.
You can only enter the values 1 to 64 for configu-
ration registers (and 80 to exit). The values for
the configuration register can be between 0 to 63.
To write a value of 0 into the decoder you have to
enter the address 80 at the control unit.
The values for the maximum and medium speed
(CV5 and CV6) are multiplied by 4 within the
decoder to achieve the correct adaption to the
values used in DCC mode (from 0 to 255).
Decoder – Reset: If you don't know how to
proceed after programming and you want to
restore the factory settings of the decoder,
you have to program a value 8 into CV8.
5. The Configuration Variables of
the Decoders 5242 und 5243
A table with a view of all relevant CVs you will find
at the last page.
◆ CV1 (primary address), CV17, 18 (extended
address): The primary address can have values
from 1 to 127. If you need more addresses,
then use the extended address mode (CV17
and 18). Only one type of address can be acti-
vate (primary or extended address). The type of
address can be selected in CV29.
◆ CV2 (start voltage)
CV6 (medium voltage)
CV5 (Maximum voltage): Each speed step must
relate to a certain motor voltage dependent on
the number of speed steps. The allocation can
be done by calculating the start-, medium and
maximum voltage or by using a table, which
contains the motor voltage for each speed step
(CV67 to CV94). The higher the motor voltage,
the higher is the speed of the locomotive. With
CV2, 5 and 6 you can adapt the speed curve
very easily and quickly.
The start voltage is the voltage provided to the
motor at speed step 1. The medium voltage is
applied at a medium speed step (depending
on the mode 7, 14 or 64) and the maximum
voltage is applied at the highest speed step.
Value of two equals about 0.8 %, a value of
255 equals 100 % of the maximum motor volt-
age. The values of all other speed steps are
calculated from these edge values. CV5, for
instance, allows the reduction of the maximum
speed of "racing locomotives". If CV5 and/or 6
have the values 0 or 1, these CVs will not be
used for calculation of the speed curve. If CV6
= 0, an exponential curve is used. That means,
that the changing of the speed depends on the
speed step.
When programming with the Roco Lok-
maus 2 you are only able to enter values from
0 to 99, so use values from 0 to 15 (8 corre-
sponds 50 %, 15 corresponds 100 %).
Tip: Shunting locomotive is too fast, change CV5
to a value of 128 (maximum speed set to
50 %). Locomotive drives troubledly at speed
step 1, change CV2 to a value from 3 to 7.
◆ CV3 (acceleration rate): The content of this CV
corresponds to the time in secondes needed
for acceleration from 0 to maximum speed. The
value 0 represents an immediate change of
speed.
◆ CV4 (deceleration rate): The value in this CV
defines the deceleration similar to CV3.
◆ CV7, 8: Here you find the manufacturer identifi-
cation number and the version.
◆ CV9 (motor control frequency): This CV defines
the motor control frequency. The possile values
you can find in the following table:
Bit Description
No.
high frequency motor con-
trol (15.6 kHz) for modern
DC and coreless motors
(e.g. Escap, Faulhaber)
0
low frequency motor control
(120 Hz) for older DC motors
and AC motors (e.g. Märklin,
see chapter 2.2, 4)
◆ CV17, 18 (extended address): See CV1 (pri-
mary address).
◆ CV19: The consist address in this register is set
by the command station, provided it supports
this feature. You don't have to program this
register yourself. It is preset to 0.
◆ CV29 (configuration register): Configuring of
basic properties of the decoder, e.g. number of
speed steps (14 or 28) and addressing mode
(short or extended address). The values of your
desired functions must be added and entered
into CV29 (see the following table):
GB
Bit CV
value value
0 0
1 1
13