15
DC Motor Control
Figure one illustrates a locomotive running in DC mode. The sound unit supplies full sound
volume at about 8.0 volts (See
) and shuts down at about 7.5 volts (See
). Motor
power is supplied around 8.5 volts (See
). Between 8.5 volts and 14 volts (The Control
Range—
and
), the sound unit monitors the track voltage and increase or decreases
the motor speed as noted by the slope of
control range
in figure one. At about 14 volts (
maximum speed is set. Motor power is removed once the control voltage falls below
Please note that this DC controller honors vStart (
), Deceleration
Rate (
) as well as the CV’s used for the speed control as set by
CV’s, the DC operation is smooth starting and stopping, comparing to DCC operations. Using
and
allows realistic sound synchronization to the startup and brake release before
the locomotive begins to move.
Figure 1
0
20
40
60
80
100
120
2
4
6
8
10 12 14 16 18
Spe
ed
`
Track Voltage
DC Mode Motor Control
Track Voltage
Control Range
