4-6-4 J3a Hudson Steam Locomotive
7
DCS Polarity Switch
DCS Operation
Located under the left side of the cab is a DPDT slide switch that allows the engine to
be controlled by DCS regardless of the direction the engine is facing or regardless of
which rail is connected to the high or positive (+) side of the Transformer or Powerpack.
If the engine is not recognized by the DCS System when it is placed on the track and
power is applied, this may mean that the engine is facing in the wrong direction based
on the track wiring of the layout being used.
If this is the case, just change the position of the slide switch and try again to add the
engine to the DCS system or, select the engine from the engine list and then do the
START UP function if the engine is already added to the DCS System being used.
(Fig. 9)
Conventional Operation
If the engine responds to the opposite indication of the direction switch on a DC
Powerpack, sliding the switch under the cab to the opposite position will put the
engine’s direction back into sync with the DC Powerpack indication.
DCS Polarity
Switch
Figure 9
