Lionel Trains 73-0020-250 - Manual (Page 21)

21
Maintaining and servicing your set
advanced connections: powering two isolated blocks with two
transformers
a
s you expand your layout, you may decide to create
two isolated blocks of track. Trains in each block
are controlled by separate transformers.
Before you operate your trains on this type of layout,
be sure that your transformers are in phase. Operating
your trains on a layout with two transformers that are
out of phase may cause damage to the locomotive’s sen-
sitive electronic components.
To be certain that your transformers are in phase, use
a small 18-volt lamp with leads (available at your local
electronics supply store) to perform a quick test. Refer
to Figure 15.
1. Attach one lamp wire to the center rail in one block.
2. Attach the second lamp wire to the center rail in the other block.
3. Power up both blocks of track. Both transformers should be set to full power.
4. See if the lamp illuminates.
If the lamp illuminates brightly, your transformers are not in phase. Do not operate your
trains on the layout until you change the wiring. If the lamp does not illuminate or the lamp
is dim, your transformers are in phase and should not cause problems.
To bring your transformers into phase, simply swap the track wires at the A and U terminals
on one of the transformers. If you are using an older transformer that lacks a polarized
plug, you may reverse the plug at the outlet so that the prongs are inserted into the opposite
openings. Repeat the procedure described above, and you should find that the lamp does not
illuminate or the lamp is dim.
This will also reverse the operation of the BELL and WHISTLE buttons on the
transformer with the switched wires.
Figure 15. Testing for proper phasing
Note!