Problem Solving - Viessmann 5242 Manual

Bit- Description
No. *)
directional lighting (FL / F0
controls white and yellow wire)
0
non-directional lighting
(CV58 controls yellow wire
load control off
1
load control on
shunting gear off
2
shunting gear switchable
with F4 (on / off)
reserved
3
reserved
*) Lenz digital plus system version 2 counts the
bits in reverse order from 1 to 8 unlike the
NMRA standard.
◆ CV58: Here you can program which function
controls which output ("function mapping").
Output A (white) is always controlled through F0
(light). Should, for example, output B (yellow)
be controlled with F1, enter value 1 into CV58.
Bit-No. CV58 output B
(yellow)
7
6
5
4
3
2
1
0
◆ CV67 (speed step 1) to CV94 (speed step 28)
speed table: Represents the motor voltage
for each of the 28 speed steps in percent. A
value of 1 represents 0.4 %, 255 corresponds
to 100 %. With 14 speed steps only the odd
positions in the table are utilized (CV67, 69,
71 etc.). With 128 speed steps the table is not
utilized.
◆ CV95 (reverse trim): When using the speed
table you can lower the speed for reverse travel
with CV95 using the following formula:
Motor voltage reverse = (motor voltage from
table) x (CV95 / 128). At 128 (or 0) the speed is
the same in both directions. If CV95, for exam-
ple, is set to 64, then the reverse speed is only
half the speed when traveling forwards.
◆ CV105, 106 (user ID): You may store any data
in these registers. The values in these registers
have no impact on the operation of the decoder.
Bit
value value
0
1
0
1
0
1
0
1
Value
F8 128
F7 64
F6 32
F5 16
F4 8
F3 4
F2 2
F1 1

6. Problem solving

CV
Lights go on and off corresponding with the
0
speed steps:
The operating mode of the locomotive and the
1
command station are not identical, e.g. the com-
mand station is set to 28 speed steps, the locomo-
0
tive to 14 speed steps. The speed step mode of
2
the command station and the decoder must always
0
be set to the same number of speed steps. Set the
4
decoder to 28 speed steps by programming for
example the value of 2 or 6 in CV29 (resp. R5).
0
Light cannot be switched on or off:
8
The operating mode of the locomotive and the
command station are not identical, e.g. the com-
mand station is set to 28 speed steps, the locomo-
tive to 14 speed steps.
Locomotive does not operate in the 128 speed
step mode:
The decoder accepts the commands in the 128
speed step mode only, when bit 1 is set in config-
uration register CV29, for example if you program
the value 2.
The locomotive "jerks" during fast acceleration:
The current draw during acceleration is particularly
high. If the current exceeds the permitted maxi-
mum, the decoder switches off the motor and tries
to accelerate once more. Reduce the track voltage
(change settings of command station or reduce
secondary voltage of transformer) or increase ac-
celeration rate in CV3.
The lights are blinking by changing the direction:
In case of changing the direction the light will also
be switched. If the start current of the bulbs is too
high, the decoder switches off the function outputs
and then starts again switching them on (result:
blinking of the lamps). Dim the function outputs
(see CV49 – 52) or use bulbs with a voltage of
more than 16 V.
The locomotive address cannot read out with
the "old" Arnold command station:
The command station uses an obsolate DCC
command, which is not used anymore. The ad-
dress, however, can be programmed. The result-
ing error message may be ignored.
The drive direction changes late while ana-
logue operation:
The decoder is fitted with a short-time memory
(approx 5 sec.), which takes care for a constant
operation on bad track contacts. While changing
the direction of travel with an analogue transform-
er, shortly the old direction is switched before the
new direction is determined.
GB
15