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[Brian H]

Luiz:
Be very careful!
Results from three APC UPS units.
First test: Last night on oldest 450 VA.
When switched while running on battery.
Caused UPS to shutdown. May have been noise
from relay in module
Test two: Older 500 VA. Ran fine on both
battery and AC
Test three APB BX1000 1000 VA. On AC was
fine. On battery acted like your test.
Button and RF no control. Then bad news.
SMOKE and burning electronic component smell.
So if your UPS seem to not run the TM751
when on battery. Don't leave it on battery
power too long as it maybe self destructing!

[luiz]

Holly cow!!! I shiver just to think that the
original idea was to have this thing
connected during my vacation (3 weeks)! Now,
my question is: any chance this effect (self
destructing) could also be happening even
when it apparently did work properly? Perhaps
with the RR501 too? Ohh man, now I'm really
scared. How can I trust on this again?

[roger1818]

Brian:  Was it the TM751 or the UPS that
smoked?  If it was the TM751, it really
sounds like there is a problem with its power
supply.

[murphy]

Most UPS units do not generate sine wave
power when running from the battery.  The
only ones that I am aware of that do are the
APC Smartups models.  I doubt that the power
supplies in X10 modules were designed to
handle non-sinusoidal power.

[Brian H]

TM751. As Murphy said.
Most UPS don't have a sine wave. The TM751
power supply smoked. Not a surprise as I saw
a message in the
www.accessha.com about some user was off the
power grid and had a modified sine wave
inverter; batteries and solar panels to keep
them charged. He also burned out a TM751.
Quick look showed the 22 Ohm 1/2W resistor
and 100uh choke assembly in heatshrink
tubing was probaly the cause. Stinks around
that area and the case was hot around them
also. They are in series with the 2.2uf 250
Volt Mylar cap used on the AC input to the
power supply.

[Brian H]

Another factor may have been the UPS was
lightly loaded and the output may have been
on the high side to start of with.

[Brian H]

Luitz; Sorry I didn't get back sooner. I
would not trust an RR501 on an UPS. It has a
line derived power supply also. Not the same
design as the TM751.

[luiz]

Thank you Brian. Any recommendation for one
that does work reliably? I need it wireless
with an embedded appliance module. If I can't
use that will have to change the layout of my
system to use one of those serial/parallel
relay boards directly controlled by a PC.

[roger1818]

Luiz:  There is the Leviton HCPRF-1TW, but I
don’t know what its power supply is like, and
it has a built in lamp module instead of an
appliance module, so it won’t work for you
anyway.

I still think you should be able to clean up
the signal by using a couple X10 noise
filters plugged into each other.  One might
be enough, but two should almost definitely
be enough.  You could then use a cube tap (or
a cheap power bar with no surge suppression)
to plug-in all of your X10 modules on the
same side of the filter.