Premier
Diesel Engine with PS-2 and Proto-Scale 3-2
6
3GS-21B GenSet
Ensuring Proper Power to Track Polarity
Changing Track Polarity Inside the Locomotive
For 2-rail DCS operation, it is important that the polarity from the transformer to
the engine is properly configured. Correct polarity can be accomplished by
ensuring that the wiring from the TIU to the track and orientation of the
locomotive when sitting on the track follows the illustration below.
Failing to properly configure the polarity for 2-rail operations will result in the
locomotive starting in reverse instead of forward or not receiving the DCS signal.
Should this occur, it is not necessary to swap the wires from the transformer to
the track or reverse the locomotive’s orientation on the track itself. Instead,
simply slide the polarity switch shown below in the opposite direction. For the
configuration and polarity shown above the DCS Polarity switch should be
towards the front of the locomotive.
To TIU Black Terminal
To TIU Red Terminal
Locomotive Front
Locomotive Rear
Proper 2-rail polarity wiring and locomotive orientation
Changing the polarity with the locomotive polarity switch
DCS Polarity Switch
