MTH SP Gs-4 Chuff Switch Question

John, Try reset Feature 27. This sets the chuff rate.

Reset Feature 27 Operation with the Z-4000 Transformer

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. Y ou 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.”

Y ou 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.

I did use a Feature 18 reset, that didn't fix it.  Would this be applicable even though the reset-18 didn't work?

John,  Reset 18 would over ride 27.  Did you lock the setting in by throttling down and up moving the engine into fwd?

The upper board receives motor voltage data.  I would check the removeable chip is inserted completely, and ensure the upper board is firmly inserted into the bottom board, with all pins connected.  G

Well, I tried reset-18 twice, and nothing changed.  The good news is, when I did the reset-27 procedure, it started chuffing away.  What a PITA it is with a standard transformer, I had to try it about three times before I got to the right count and didn't overshoot.

I'm at a loss why a reset-18 wouldn't set some defaults here, that really sucks.

Glad you got it working John. Reset 18 never fixed the chuff for me neither. It is like they wrote the code for reset 27 after they did reset 18. I would have gotten back to you sooner but I was up in the shop all day.

Interesting to note, since the directions indicate it would.  I need to go look at some QSI reference documents, they did a better job of specifying what values are changed with a reset.  G

No problem Forest, all's well that ends well.  I actually converted another PS/1 steamer to TMCC, and for some reason, I never did notice that there was no chuff switch, so I thought I was missing something!