Reset 27 (chuff rate)
A reset "27"
is used to change the chuff
rate of an original protosound engine. It allows you to set the track
voltage at which the engine's chuff will start and also the track
voltage at which the chuff will be at its fastest. If your
is missing it's "chuff" sound, it is recommended to first try
factory reset. If that does not work proceed with the Reset 27. Please
be sure the engine contains a well charged battery before any reset
procedure is performed.
NOTE: These instructions explain how to perform a Reset 27 (chuff rate)
using a Z-4000. If you are
using another type of transformer then you will need to put the engine
into Reset 27 following the
instructions in your operator’s instructions. After hearing
the five clanks and two clinks then start at
step four of these instructions.
One of the most popular features on the Z-4000 Transformer is the
simplicity of programming your
ProtoSound equipped engines by using Program Mode. With a scrolling
menu and push button access,
MTH has eliminated the need to run the throttle up and down while
counting the “Clinks” and
set up the operation of the engine. Program operation is explained in
detail in the Operating Instructions
shipped with each transformer. However, use of Reset Feature 27, Chuff
Thresholds for Steam Engines, which operates differently than the other features, was not included in
the initial printing.
Reset Feature 27 allows the operator to “fine tune”
the rate of chuff relative to the speed of the engine by setting the
minimum and maximum chuff points. To do this with the Z-4000, follow
the steps below:
1) With the steam engine on the track, and the transformer throttles in
the “OFF” position, press the
“PROGRAM” button for
the track in use. The display will read “00” and
2) Using the “WST/HRN” button, scroll the top
display up to “27,” then press “BELL
The transformer will power the engine in
Reset, and run the ProtoSounds to Reset Feature 27
(5 Clanks, 2 Clinks).
3) Raise the throttle from the “OFF” position and
press the “PROGRAM” button. This will release the
transformer from the Program Mode
without the engine leaving Reset Feature 27.
4) With the throttle set low , press the “WST/HRN”
button. You will heara single bell, and the engine
will begin to move forward with no chuff.
5) Reduce the throttle until the engine just stalls, and press
“WST/HRN.” You will heara double bell.
This is the motor speed where the chuff
will Begin. (Normally around 6.0 volts).
6) Raise the throttle until the engine is running at the speed that you
want the chuff to be the fastest, and
press ”WST/HRN.” You
will hear three bells, and the engine will Stop. (MTH suggests 12-13
7) Bring the throttle to the “OFF” position to
complete the Reset feature.
Test the settings by running the engine. You may need to repeat the
procedure to further adjust the
thresholds. And remember you can always return to the Default Settings
by using Reset Feature 18.