SoundTraxx Tsunami Steam Users Guide - Manual (Page 64)

Tsunami Steam Sound User’s Guide Page 61
Miscellaneous Features
Step 10: Floobydust - Configuring Tsunami’s
Miscellaneous Features
F11 Train Brake
By now you’ve no doubt discovered that Function F11 can be used to turn
Tsunami’s brake squeal sound on and off. What you may not realize is that
F11 can also be used to slow your train down as if the brakes really are
applied!
To achieve this effect, you will need to first program some momentum into
Tsunami using CV 3 and CV 4 to set the acceleration and braking rate
respectively. The exact value is unimportant but should be large enough to
produce a noticeable delay in the throttle response. A setting of 20 or so will
do the trick. The reason for programming CV 3 (acceleration rate) is so the
train does not immediately resume its old speed when the F11 function is
released.
Next, program CV 61 (F11 Brake Rate) to adjust the rate at which the train
will slow down when F11 is turned on. A value of 1 to 128 is added to the
value programmed in CV 4 which has the effect of slowing the train more
gradually than by simply turning the throttle down. Values of 129 thru 255
translate to -1 thru -127 which have the opposite effect as they subtracted
from the setting in CV 4 and slow the train more aggressively than turning the
throttle down (as a brake would be expected to do).
Be careful not to set F11 too high - if you do, the net braking rate will be zero
and you will have effectively turned F11 into an emergency stop button!
Note that setting CV 61 to a value of 0 or 128 has no effect on the brake rate
and basically disables this feature.
DC Braking
The DC Braking feature allows you to configure Tsunami to bring the
locomotive to a gentle stop whenever DC power is present on the track. In
this manner you can implement an inexpensive ‘braking section’ for stopping
locomotives in front of a red block signal. This is done by using a relay or
other switch to supply a section of track ahead of the signal with DC when
the signal is red and DCC power when the signal is green. Then, configure
Tsunami decoder as follows:
1. Set CV 11, Packet Time Out Value. CV 11 determines the amount of
time, in 0.25 second increments, that elapses between when Tsunami
first detects the loss of the DCC control signal and when it begins to
bring the locomotive to a stop. For DC Braking, we suggest using a small
value of 1 or 2 corresponding to a detection time of a 1/4 to 1/2 second.
2. Set CV 3 (Acceleration Rate) and CV 4 (Braking Rate). Since you won’t
want your train to come to a sudden stop, you’ll need to set these CVs so