M.T.H. engines equipped with Proto-Sound 3.0 have speed control capabilities that allow the
engine to maintain a constant speed up and down grades and around curves, much like an
automobile cruise control. You can add or drop cars on the run, and the engine will maintain
the speed you set.
While the engine is programmed to start with the speed control feature activated, you can
opt to turn it off. This means the engine's speed will fall as it labors up a hill and increase as
it travels downward. It is also affected by the addition or releasing of cars while on the run.
Because the engine will run more slowly at a given throttle voltage when speed control is on
than when it is off, you should adjust the throttle to a lower power level for operation with
speed control off to avoid high-speed derailments. When speed control is off, the volume
will drop to allow for better low voltage operation.
To turn speed control on and off
, put the engine in neutral, then quickly tap the
transformer's Horn button one time then quickly tap the Bell button two times, allowing
approximately ½ second to lapse between each quick button press. Two horn blasts will
indicate that the engine has made the change. Repeat the 1 horn, 2 bells code to return it to
the other condition. You will want to do this during the initial neutral upon start-up if you
ever couple this engine to another engine that is not equipped with speed control to avoid
damaging the motors in either engine. Each time you shut down the engine completely, it
will automatically turn speed control on.
Speed Control
Horn
Place
Engine into
Neutral
Bell
Bell
=
Speed Control
Two Horn Blasts
(indicates change is made)
Repeat to Return
to Normal Condition
Locking Locomotive Into A Direction
You can lock your engine into a direction (forward, neutral, or reverse) so that it will not
change directions. To do this, put the engine into the direction you want (or into neutral to
lock it into neutral), run it at a very slow crawl (as slowly as it will move without halting), and
quickly but firmly tap the Horn button once followed by three quick taps of the Bell button,
allowing approximately ½ second to lapse between each quick button press. Two horn blasts
will indicate that the engine has made the change. The engine will not change direction
(including going into neutral) until you repeat the 1 horn, 3 bells code to return the engine to
its normal condition, even if the engine is kept without power for extended periods of time.
Horn
Place
Engine into
Desired
Direction
Horn
Bell
Bell
Bell
=
Direction Lock
Two Horn Blasts
(indicates change is made)
Repeat to Return
to Normal Condition
Premier SD50 Diesel Engine
12
