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 engine is missing it's "chuff" sound, it is recommended to first try a 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 “Clanks” to
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 “PG”.

2) Using the “WST/HRN” button, scroll the top display up to “27,” then press “BELL SELECT.”
    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 volts).

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.