That is interesting, since the Sola device has a to the line frequency
tuned tank circuit in it, thus the output should not have to many higher
harmonics and should look reasonable close to sinusoidal see here:
http://www.rdrelectronics.com/russ/jun16/vs2.PDF
73
K6UHN Alex
On 7/24/2016 4:23 PM, David wrote:
On Sun, 24 Jul 2016 14:45:02 -0700, you wrote:
Hi Bob:
The Sola 500 VA transformer is specified to hole up the line voltage for 3 ms.
(but not a half cycle of the line
frequency).
I've connected the Sola CVS transformer to the output of the APC RS1500 backup
UPS. (needed to replace the 2 batteries
in the main unit and probably within a year the 4 batteries in the optional
battery pack.
http://www.prc68.com/I/Sola_CVS.html
http://www.prc68.com/I/PC.shtml#Backup_UPS
The Sola transformer is connected to the output of the RS1500. This will clean
up any spikes or narrow drop outs on the
AC line since when the AC line is active the UPS does nothing.
My hope was that the transformer would clean up the modified square wave output
of the UPS, but that does not happen.
Video of APC self test showing waveform on scope:https://youtu.be/DLE0mzAt7KY
<https://youtu.be/DLE0mzAt7KY>
Was the Sola transformer under load when you ran the test? I thought
a minimum load was a requirement for proper operation. Maybe it is
time to get an online UPS or power conditioner but then you would not
need the constant voltage transformer.
Was the peak voltage still 170 volts? If so then maybe it does not
matter. Capacitive input loads and PFC power supplies should not
care.
I think the modified square wave killed my HP 6200 flat bed scanner. The best
scanner I've used and no longer made.
Ouch. That is not suppose to happen but apparently some switching
power supplies have problems with modified sine outputs even though
they should not.
I have been told a couple of times that PFC power supplies are even
more likely to have problems with modified sine inverters but I have
yet to find an in depth discussion of the problem. The PFC stage
should work with any input wave shape.
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