PBM-2 Power Backup Module
A PBM can be added to a HO model train locomotive so that if the
model train wheels loose connection from the track because of dirty track or
other problems, the Power Backup Module will supply power to the Locomotive
Module for up to many seconds to keep operating properly without sounds, lights,
or even motor stopping!
What is special about the RaiPro PBM is that the PBM
is an active power backup not a passive one like many other power
backups. Many others are basically just super capacitors that the voltage drops
exponentially as soon as the power is removed. With other backups, lights
continually dim and module performance is effected. Our PBM has onboard
microcontroller and other electronics that will output a fixed voltage similar
to a good power supply output so lights stay constant while PBM is active and
locomotives perform better.
Features: Simple Connection with Only 2 Wires
Size: 1.27 x 0.66 x 0.32 inches
Run time lights only: ~18 Seconds
Run time lights and sounds: ~14 Seconds
Run time lights, sounds, and pulling a train:
Varies greatly depending on locomotive, speed, load etc.
Please see frequently asked questions below for more information on run time
pulling a train.
PBM-2 Power Backup Module
Made In USA
Not recommended for persons under the age of 14
PBM Frequently Asked Questions
What is the most
important aspect of a power backup module?
In our opinion,
the most important aspect of a PBM is its ability to power a
locomotive pulling a train across dead track. Our PBM works so
well that one of our locomotives pulled twelve cars across thirty
inches of dead track without stopping while the lights and sounds
were on! We tested some other super capacitor only power
backup products that only covered a small fraction of the distance
and were as large as our PBM!
If the most
important aspect is powering the locomotive pulling a train, why is
there so many others that show or talk about the time the lights
Powering a train can take many times the power then to just have
light and/or sounds on because the motor can use much more power
than powering the lights and/or sounds. We have seen super
capacitor only designs that have real long
light on time but
when you try to pull a train the results were very poor.
One product we
tested had many seconds of light and/or sound on time but when
pulling a train it died in less than 0.2 seconds! This is why
we think many talk about or show light on time because it makes
their products look better than they may perform when actually
pulling a train.
Do I have to use a PBM in all my
locomotives for them to run well?
If your layout is powered by a RailPro power
supply, you have quality locomotives, your layout is properly wired,
and you do a reasonable job of keeping your track and locomotive
wheels clean, you can have a good running layout without PBMs.
So who does Ring Engineering sell PBMs for if some RailPro customers
do not really need them?
There are many RailPro customers that run on other peoples layouts
(like at train clubs) and they cannot control how clean or
maintained the track is. There are some RailPro customers that do
clean their track regularly but just want extra insurance to be sure
they get the best operation possible.
Is it ok to use
other companies power backup like devices with RailPro locomotive
products should only be used as described in their user manuals.
The LM user manuals do not say it is ok to connect super capacitors.
Using our products in a way not in compliance with our user manuals
will void the warranty of the Ring Engineering product and may cause
serious problems. There is no public specification on how to
design power backup units so there is no guarantee of compatibility.
We believe that some regular super capacitor designs have been used
with RailPro LM modules and damaged the RailPro modules. If
you want power backup you should only use a Ring Engineering PBM
with your RailPro locomotive modules.
If a power backup has more Farads of super capacitors is it better?
The amount of
capacitance (Farads) is only one factor and may not be a real good
one when trying to compare one power backup to another. There
are other important features to consider besides capacitance.
For example a one Farad device can be a lot better than a two farad
device. The two farad device may allow lights to run longer
but not be able to power a moving train well. There is
simply a lot more to it then simply comparing how much capacitance a
backup device has built into it.
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