MTHTrains 20-20566-1, Operator'S Manual

Page: 7 / 49

DD40AX Diesel Engine
7
Modes of Operation
The following pages have detailed descriptions of the 4 different modes of operation:
-Conventional AC
-Conventional DC
-DCS [MTH Digital Command System]
-DCC
Conventional AC Operation
When using conventional AC power, the engine will respond to changes in track voltage.
An increase in track voltage will increase the locomotive speed and a reduction in track
voltage will reduce the engine speed.
A short interruption (approximately 1 to 2 seconds) in the track voltage will cause the
engine to cycle in the sequence for each track voltage interruption (neutral – forward
– neutral – reverse) When power is first applied to the track, the locomotive will be
silent for 1-20 seconds and the headlight will be on, indicating the super capacitors are
charging (The super capacitors provide power to the sound system during direction
changes or intermittent drops in track power due to dirty track switches, when operating
in conventional mode). When the super capacitors are charged, all the lights will come
on and the engine sounds will start up. There should be no movement, as the engine is in
neutral. Causing a short interruption of track power by using the direction button on the
transformer, or by bringingthe throttle to 0 volts and back again, will change the sequence
to the forward state. Then increasing the throttle will begin to move the engine forward,
and speed will increase as the throttle is advanced.
If there is another interruption in track power the sequence will change to the neutral
position again. The engine will remain in the neutral state until there is another
interruption in track power. The next interruption in track power will move the sequence
to the reverse state. The engine will now move in the reverse direction. If the power
interruption was accomplished by using the direction button and the throttle position was
not changed, the engine will run in the reverse direction at the same speed that it was
traveling in the forward position.
Subsequent interruptions in track power of 1-2 seconds will continue the sequence
rotation. If you happen to interrupt track power for longer than about 2 seconds, the
engine will begin its shut down sounds. If this occurs you can cycle the direction
sequence again to get back to the direction you wish to move and once the engine starts
moving its shut down sounds will stop playing (SEE PAGE 8 (direction cycle phases)).
In conventional AC operation the whistle sound, the bell sound, PFA sounds and other
operational functions can be accessed if your transformer has a horn/whistle button and
a bell button. By using combinations of button presses, different commands besides
blowing the whistle and ringing the bell can be initiated.