User manual | Automatic Back-n-Forth COMBO #609

246 W. Main St.
Leola, PA 17540
(717) 661-7041
www.dallee.com
AUTOMATIC BACK AND FORTH provides a simple means of testing locomotives on a workbench or having action on the
layout that does not require an operator. This can be useful in the operation of a trolley line that would otherwise be merely
scenery. This action enhances the overall motion that would normally occur during operation and adds to the illusion of activity.
This automation can be accomplished simply, using DALLEE ELECTRONICS components, in any gauge or scale provided
DC power is applied to the track and the device operating can respond to polarity reversing. This package provides for a timed
stop at each end, in addition to the track polarity being reversed.These types of BACK-N-FORTH operations are available in
multiple scenarios. The simplest is found in items 561 to 564. These merely reverse the track power based on a time function
and are limited to a total travel time of approximately 2 minutes. If the track or travel time is longer than this you cannot have a
stop occur at the ends. Thus you need to sense when you get there which is what this package of components does. The end
stop time only starts when you arrive at the end and does not start before that.
The overall operation is as follows: The TRAK-DTT2, when current flow is sensed by a locomotive or trolley reaching the end
rail section, will activate its relay for an adjustable time frame and then do nothing further until it's time is up. When the relay
contacts are wired to remove power from the track, a stop occurs. In simplified terms, when the time frame has elapsed, the
relay relaxes restoring track power. If the wires to the end rails are routed through the detection coil of the TRAK-DTT a stop
will occur at each end and if we then wire the power through the detection coils of the TRAK-DTRL, polarity will be reversed
when each end is activated via locomotive or illuminated car entry. This circuit is shown on page 2. The TRAK-DTRL will
change the state of its double pole double throw relay every time it senses current flow in an opposite sense coil. In this case
the "SET" and "RESET" sense coils. The relay contacts are wired as a polarity reversing switch. The end rail sections are
insulated and wired through the detection coils of the TRAK-DTRL as well as the detection coil of the TRAK-DTT2.
Including a timed stop at each end as above assumes that the time frame for each stop is the same. This would be the normal
usage. If you should desire to have a different time frame at each end it will be necessary to add another TRAK-DTT2. It is
also possible to include intermediate stops at any location provided the distance between stops is adequate to allow a few
seconds running time so that the time circuit of the TRAK-DTT2 can reset. If the time frame of the intermediate stop is the
same as at the ends the original TRAK-DTT2 can be utilized with additional wiring. The TRAK-DTT2 routes track power before
the TRAK-DTRL sensors so that polarity does not reverse during an intermediate stop. The inclusion of the intermediate stop
in the circuitry is shown on page 3. If it is desired that the intermediate stops have a different time frame, another TRAK-DTT2
would be needed for each different time frame. Multiple stops can also be accomplished by just gapping the track as shown
for the single STOP section.
In one application we have done, on an automated trolley line, there were a total of nine stops, including the end stops. If all
stops had been of equal time, the automation could have been accomplished with only one TRAK-DTRL and TRAK-DTT2.
The actual installation involved four separate time frames so there were four TRAK-DTT2 units utilized. Thus creating a more
realistic effect.
Tips for good operation: Because we are depending on current flow it is important that both the rail and the wheels be kept
reasonably clean so that the possibility of faulty sensing is minimized. It is also necessary that the track length between the
ends be long enough that there will be at least a few seconds running time to allow the circuitry to reset itself so that further
detection can be made.
By utilizing the TRAK-DTRL, we eliminated the possibility of double reversing at the ends, so it is impossible to have any
trolley run off the ends unless you have reversed the tracks power. So it is important to have the tracks power supply / throttle
kept in the proper direction. Upon first powering up, set the trolley in the middle of the track. Then apply track power. The
trolley needs to traverse towards the "SET" sense end first (the right end of the drawing). If you are not, reverse the polarity of
the power pack. Thereafter the power packs reverse should not be needed. If you are using a fixed DC source to operate the
trolley, or you know the polarity of the DC Track Power, then connect the "+" wire to the Red wire and the "-" to the dark brown
wire (if this is a G gauge train, then you have to reverse this since their standard is opposite of the NMRA). Then your polarity
will be correct for operation. The TRAK-DTRL is wired to provide a fixed polarity to the track upon each sense coils detection.
It will not reverse like the TRAK-DTL.
The main problem with any automation is the lack of adequate power from some power packs, you need at least 20VA of
power. If you have inadequate power, your trolley will travel improperly. A suggestion to cure this problem is to either run the
12VPS (electronics) on one power pack and run the trolley on another. Another solution is to use Item #690 or #990 to power
the electronics.
STOP &
REVERSE
16 VAC
input power
12VPS
(#369)
TRACK
POWER
( DC )
P
246 W. Main St.
Leola, PA 17540
(717) 661-7041
www.dallee.com
TRAK-DTRL
(#566)
remove jumper
if present.
pass insulated
wire through
sense coil DO NOT strip
off insulation !
TRAK-DTT2
(#368)
The time adjust should be
set to approx. 10 O'Clock (a
few seconds) or more.
Use #6 screws to secure boards.
Install stranded wires by stripping insulation
back 3/16", place wire in hole, run screw
down to clamp in position. Make sure wires
do not short to adjacent terminals!
RUN SECTION
pass insulated
wire through
sense coils DO NOT strip
off insulation !
all Back-N-Forth operations:
require DC (polarity reverse) track operation.
are best to start running in the middle.
require a few seconds (5 or better) of time from
leaving one stop location and arriving at the next
stop location!
long lengths of track between locations does not
affect the operation, very short lengths that
transverse in a short time are not recommended.
#22 - 24 awg wire can
be used to wire the
12VPS output to the
other devices (Trak-xxx
units). Heavier wire can
always be used.
+
12vDC
-
A
G
-
+
If you don't know the track
power polarity and run off the
end , reverse these two wires or
your reversing switch.
If "G" gauge, reverse the "+" and
"-" of the TRACK POWER's DC
(Not that of the 12VPS).
All wires crossing each other only
connect when a DOT "•" is shown.
Standard wiring practices:
A
G
P
STOP &
REVERSE
This system has memory so that
whenever it is turned off and back on, it
will still remember the previous direction.
It is not important where the trolley/engine
is when powering up but it is important
that the track power throttle remains in
the correct direction. Otherwise the end
reverse will go off the track!
Wire colors are shown for convenience.
The wire color also changes to signify the
passing of it through a sense coil even
though it is still the same wire. This helps
in troubleshooting the wiring as well as
the initial wiring.
GAP: a "GAP" (cut rail to provide an air "GAP" or
use insulated plastic rail joiners, wood is
not recommended) is placed on one rail as
shown to form the "SIGNALED SECTION".
In this case the "SIGNALED SECTION" is
the section labeled "STOP & REVERSE"
and also "STOP".
AUTOMATIC REVERSE with TIMED STOP AT ENDS with reverse memory.
STOP &
REVERSE
16 VAC
input power
12VPS
(#369)
TRACK
POWER
( DC )
P
pass insulated
wire through
sense coils DO NOT strip
off insulation !
246 W. Main St.
Leola, PA 17540
(717) 661-7041
www.dallee.com
RUN SECTION
TRAK-DTRL
(#566)
A
G
P
all Back-N-Forth operations:
require DC (polarity reverse) track operation.
are best to start running in the middle.
require a few seconds (5 or better) of time from
leaving one stop location and arriving at the next
stop location!
long lengths of track between locations does not
affect the operation, very short lengths that
transverse in a short time are not recommended.
#22 - 24 awg wire can
be used to wire the
12VPS output to the
other devices (Trak-xxx
units). Heavier wire can
always be used.
+
12vDC
-
A
G
-
+
If you don't know the track
power polarity and run off the
end , reverse these two wires or
your reversing switch.
If "G" gauge, reverse the "+" and
"-" of the TRACK POWER's DC
(Not that of the 12VPS).
All wires crossing each other only
connect when a DOT "•" is shown.
Standard wiring practices:
STOP
A
G
P
remove
jumper if
present.
A
G
P
STOP &
REVERSE
This system has memory so that
whenever it is turned off and back on, it
will still remember the previous direction.
It is not important where the trolley/engine
is when powering up but it is important
that the track power throttle remains in
the correct direction. Otherwise the end
reverse will go off the track!
Wire colors are shown for convenience.
The wire color also changes to signify the
passing of it through a sense coil even
though it is still the same wire. This helps
in troubleshooting the wiring as well as
the initial wiring.
The center "STOP" section has the same
timing as the end stops. More than one can be
made by simply duplicating the wiring to this
stop. If different timing is required, another
Trak-DTT2 is needed.
GAP: a "GAP" (cut rail to provide an air "GAP" or
use insulated plastic rail joiners, wood is
not recommended) is placed on one rail as
shown to form the "SIGNALED SECTION".
In this case the "SIGNALED SECTION" is
the section labeled "STOP & REVERSE"
and also "STOP".
RUN SECTION
pass insulated
wire through
sense coil DO NOT strip
off insulation !
TRAK-DTT2
(#368)
The time adjust should be
set to approx. 10 O'Clock (a
few seconds) or more.
Use #6 screws to secure boards.
Install stranded wires by stripping insulation
back 3/16", place wire in hole, run screw
down to clamp in position. Make sure wires
do not short to adjacent terminals!
AUTOMATIC REVERSE with TIMED STOP AT ENDS & BETWEEN with reverse memory.

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