Advanced Programming
Tsunami2 Electric User’s Guide
60
3.
To allow forward-driving and reverse-driving whistle signals to be issued after the throttle is
increased from zero and before the locomotive begins to move, set CV 216 to a value of 3.
The locomotive will begin to move when the throttle is increased from speed-step 3.
Enabling Back-EMF and Auto-Stop
Back-EMF is enabled by default to better regulate the operation of the motor. Disabling back-
EMF control will deactivate all back-EMF regulated automatic features, such as Dynamic Digital
Exhaust. Enter a value of 8 to enable auto-stop. Enabling auto-stop will bring the locomotive to
a stop for 500ms before changing direction.
Setting the Constant Braking Distance
CV 220 determines the fixed distance over which the locomotive will decelerate to a stop after
setting the throttle to zero. Constant Brake Distance enables the train to be stopped in a set
fixed distance regardless of speed.
Entering a value from 1 to 255 into CV 220 will adjust the constant brake distance from
minimum to maximum. Entering a value of 0 into CV 220 will disable the constant brake
distance feature, as will disabling Back-EMF in CV 217.
The Constant Brake Distance feature is only activated when the throttle is set to speed step 0.
The value entered in CV 220 is a portion of available stopping distance and not a unit of time or
distance. Each model may require different values in CV 220 to obtain the same stopping
distance due to difference in gear ratios, motor RPMs and driveline disparities.
The feature works best with CV 3 Baseline Acceleration Rate and CV 4 Baseline Deceleration
Rate are set to values greater than 0. This added momentum allows the throttle to be quickly
reduced to speed step 0, enabling the Constant Brake Distance feature, while the locomotive
continues to travel at speed.
When activated, the feature will override all braking rates set in CV 116, CV117 and CV 118
along with the Baseline Deceleration Rate in CV 4. Any throttle increase in from speed step 0
will turn off the feature and the locomotive will accelerate back to the desired speed step set by
the throttle.