ZS048P Double Fairlie Sound For Zimo

Reverser Control – F5

This project has two reverser positions in each direction. The default setting is ‘full gear’ but a cut-off of around 60% is available with the F 5 key which operates as a reverser. The exhaust sounds are modified as follows:

 

Full Gear. This is the one to use to start with a heavy train on the hook. Steam is admitted to the cylinders for the full piston stroke. The chuffs are loud and harsh as steam at virtually boiler pressure is exhausted. This configuration gives the maximum power, but is the least efficient setting.

 

Cut-Off. With a light engine movement, or when a train has been ‘lifted’, the driver will reduce the duration for which steam is admitted to the cylinders. The steam still provides power for the rest of the stroke by expansion. This reduces the pressure of the exhausted steam, resulting in softer more subdued Chuffing.

 

We have provided the reverser so that you can change the sounds to simulate reality more closely. In model form, there’s nothing to stop you from using it to vary the exhaust sounds simply to add interest.

Wagons Snatching and Buffering

 

Enabled with F Key 13; if it not engaged, the wagon Snatching and Buffering sounds will not play under any circumstances.

 

If the key is engaged, and the Light Engine Mode (F key 14) is also engaged, the sounds will not play under any circumstances. (No wagons coupled in Light Engine Mode).

 

If the key is engaged, and the Light Engine Mode (F key 14) is not engaged, sounds will operate in the following automated way:

 

Loco is stationary. The sounds are not played.

 

Loco moves off/accelerates gently. The sounds are not played.

 

Loco moves off/accelerates more rapidly. The sound of the couplings taking up slack as the train stretches plays. This is also the case if the loco accelerates further when already moving.

 

Loco decelerates gently. The sounds are not played.

 

Loco decelerates more rapidly. The sound of several wagons buffering up is played each time.

 

Loco comes to a halt with the Brake Key (F key 2) engaged. The sound of several wagons buffering up is played after it comes to a halt.

Live Volume Control

Provide the sound is switched on and the ‘fade’ button is not active, it is possible to change the overall volume to suit changing needs.

Engage F27 and the sound levels will gradually reduce, eventually to silence

Engage F28 and the sound levels will gradually increase, eventually to maximum.

In each case, disengage the F key when the desired level is attained. Set F27 and F28 as ‘momentary’ if your DCC controller allows you to do so.

Note: If the volume controls appear not to function, check that F19, F27 and F28 are disengaged before making a further attempt.

Function List

 

Note.  The double Fairlie has two firing points, only one of which would normally be open at a time. Coal shovelling is available on F keys 6 and 16. Each also controls a separate Function Output so if your model is equipped with firebox LEDs, each can be operated independently..