H0 Sound Decoder MX640 Page 31
Automated recording of the motors “basic load” factor:
This is again shown here by means of the ZIMO cab (with the planned special MX31 display) but is
valid analogous for the function keys of other cabs.
MENU SOUND Incr.Prog
.
CV 266 CV 267 CV 268
((((( + Total Chuff Part -
volume beat volume
(((( - steam
+ 2 - 40 + 3
(((( 0
= 43 = 17 = 255
ZIMO MX31 key arrangement :
(((((
1
F0
(((((
2
F1
(((((
3
F2
(((((
4
F3
(((((
5
F4
(((((
6
F5
(((((
7
F6
(((((
8
F7
(((((
9
F8
The following procedure is necessary to enable load dependent chuff sounds (volume and sound
changes with inclines and load….) that is, to optimize the current values.
The function keys have the following special meaning
during the selection
procedure!
Technical background:
The load dependent sound is based on EMF (Electro Motive Force) measurements inside the decoder, which is
primarily used for keeping the motor speed constant with changes in load, also known as BEMF. For the decoder
to produce the correct sound for the respective driving conditions it has to know first what these measurements are
at normal no-load cruising speed (smooth rolling of the engine or train on straight level track) that is, the “basic
load” of an engine or train, which due to gearbox losses, power pick-ups etc. is often considerably higher on model
trains than on the real railroad. Deviations from this “basic load” will then be interpreted as inclines or declines,
which will result in
Incrementing !
Decrementing !
analogously changed chuff sounds.
Initiated with “Pseudo-Programming”
CV #302 = 75
an automated run is performed to record the “basic load” factor in forward direction;
ATTENTION: the engine (or the train) is driven automatically in forward direction for which
unoccupied track must be available of at least 5 meters (15 feet), with absolutely no inclines
or declines and without any (tight) curves.
With
CV #302 = 76
an automated recording run can be performed in reverse direction, for locomotives that have differ-
ent “basic loads” in this direction (otherwise, reverse is considered identical to forward).
Note: A “heavy” train (a train with higher rolling resistance due to power pick ups of lighted coaches
for example) may have a different “basic load” than an engine with nothing on the hook. A separate
recording run may be required for such situation in order to obtain the best load dependent sound.
For easier handling of different “basic loads”, provisions will be made with a future SW version that
allows the recording of several “basic load” factors and the easy switching between a light running
locomotive and a “heavy” train.
Simplified procedure (without using CV #300) with MX31, SW1.2 or MX31ZL, SW3.06
Programming sound CV’s:
Configuration variables are for optimizing the sound effect for a specific locomotive and for special
operating situations. The
programming
can be done either on the programming track in
service
mode,
on the main track in
operations mode
or with
“incremental programming”.
The “incremental programming” is a special process of the “operations mode” programming with the
following fundamental principle: the CV’s are not programmed with an absolute value (as is normally
the case) but rather the current value of a CV is being incremented or decremented by a fixed value
(defined in the decoder for each CV).
The function keys of the cab temporarily serve as instruments for the incremental programming dur-
ing which they cannot be used to actuate function outputs. The function keys are assigned to this
with the “Pseudo-Programming”
CV #301 = 66
,
which changes the function keys to INC and DEC keys, first for CV #266 (that is the CV number de-
rived from the value 66 + 200).
Several CV’s are grouped together in one procedure for an easier and better handling. In the case of
CV #301 = 66 is not only the leading CV #266 assigned for incremental programming but CV #266,
#267 and #268 as well.
Set to default !
Drawing of an MX31 display, not a photo!
The last line shown in gray (absolute CV values) will no be available until bidirectional communication is being implemented!
F0, F3, F6
=
Incrementing, decrementing and default setting of the lead CV number that was
entered during the “Pseudo-Programming” initiation CV #301 = … (or via menu
with the MX31).
F1, F4, F7
=
Incrementing, decrementing and default setting of the second CV number of that
group; which CV’s that are part of a group is shown in the CV table or is
indicated in the ZIMO MX31 cab display.
F2, F5, F8
=
Incrementing, decrementing and default setting of the third CV number of that
group (if the group includes 3 CV’s).
The incrementing and decrementing of CV values (usually in the 0…255 range) takes place in steps
of 1, 5, 10 or 15; this is predefined by the decoder software and cannot be changed. Intermediate
values can be entered by direct CV programming, which in reality is hardly necessary.
cuckoo jingle”
sounds when….
The
“
…. the upper or lower end of a CV value range is reached!
If RailCom is not available (because the system used is not equipped with RailCom), the value of a
particular CV can only be determined by reading it out on the programming track.
Although, most of
the time this is not necessary since the reaction to a changed CV value can immediately be heard by
the changing sound.
Note: All CV and parameter sets can be read out and written to the decoder and, if required, edited
with a computer with the help of the MXDECUP programming module!
CV tables for SOUND CONFIGURATIONS:
