Summary Table of Engine DirectionsCondition Direction Change CycleCase #1: First power up or without power longer than 5 sec.
E unit off (switch in PROG position) N, F, N, F, etc.E unit on (switch in RUN position) N, F, N, R, etc.Case #2: Engine without power for less than 2.5 seconds
E unit off (switch in PROG position) N, Last-Dir, N, Last-Dir, etc.E unit on (switch in RUN position) N, F, N, R, etc.With your 104 E reversing unit, positioning
the switch in the PROG position locks your engine into its last moving direction plus neu-
tral. Positioning the switch in the RUN posi-
tion resumes normal sequencing operation.
Your GP-9’s 104 E Reverse unit
The New E-Series Reversing Unit controls
the direction of the engine. When the
reversing unit senses an interruption in
track power, it will cycle into the next direc-
tion in the sequence. The sequence is neu-
tral, forward, neutral, reverse.... Track power interruptions are created using the direc-
tion control on your transformer or Cab-1,
or by turning the throttle to zero.
When power is first applied (or after a 5
second power interruption), the engine will power up in neutral, always before for-
ward. A single press of the direction button
will set your engine in forward motion. This
will help eliminate unexpected start ups,
derailments, and crashes. Listed in the
table below is the direction sequence pat-
tern that your 104 E unit will follow under
the given conditions.
As always, a lockout switch is included to deactivate the 104 E’s sequencing func-
tion. (for switch location see illustration
below) A new feature is that now you will have a neutral available even when the
reversing unit is “off”. In addition, you no longer have to slow the engine by hand to
turn off the reversing unit while the train is
moving. Simply stop the engine, and throw
the switch. The 104 E unit will be locked into its last moving direction, plus neutral.
Even simpler, just put the switch in the
“PROG” position and keep power off for 5 seconds. When you start, you will be locked in neutral/forward. If you want to lock your engine in reverse for any length of time, it is
recommended that you reverse the spade
connections (blue and yellow) on the top of the motor (see page 8). Otherwise, your “reverse” lock will become a “forward” lock after any 5 second power off.
NOTE: Due to limitations of the electronic components, it is hard to predict how each
engine will function when power is inter-
rupted between 2.5 seconds and 5 sec-
onds. Engines will function either as in case
#1 or case #2. This solely depends on the
tolerances of the installed electronics and is
not affected or caused by your power sup-
ply.
5
RUN
LCRU
PROG
Underside of GP-9
