<font size=2 face="sans-serif">Hi Drake,</font>
<br><font size=2 face="sans-serif">Motor loads with control circuitry tend
to have problems with MSW (phase detection or zero crossing). There are
plenty of motor loads out there that are powered by modified sine wave,
so it is not </font>
<br><font size=2 face="sans-serif">a hard fast rule that all motor loads
have problems with MSW. You can look at the waveform on a scope. Under
no load, it should have the appearance of a square wave with a ground-level
step between each 1/2 cycle. Although the DR incorporated a robust design
with good surge capability, they typically fail due to control board or
AC board related issues. They are technically still repairable, although
parts supplies are dwindling. The cost of true sine wave inverters has
come down significantly in recent years. That way you don't need to worry
about compatibility.</font>
<br><font size=2 face="sans-serif">Rgds,<br>
</font><font size=3 color=#008000>_________________________________________________________________________________________</font><font size=3>
</font><font size=1 face="Arial"><b><br>
Eric Bentsen</b></font><font size=3><b> </b></font><font size=1 face="Arial">
| </font><font size=1 color=#008000 face="Arial"><b>Schneider Electric
</b></font><font size=1 face="Arial"><b> | Customer Care Center
| Advanced Technical Support </b> | <b>Technical Support Engineer<br>
Phone:</b> 866-519-1470 option #1 | <b>Schneider Electric
Support Center:</b> +800-640-0770 <b><br>
Email:</b> </font><a href="mailto:eric.bentsen@schneider-electric.com"><font size=1 color=blue face="Arial"><u>eric.bentsen@schneider-electric.com</u></font></a><font size=1 face="Arial">
| <b>Site:</b></font><a href="http://www.schneider-electric.com/solar/" target=_blank><font size=1 color=blue face="Arial"><u>
www.schneider-electric.com/solar</u></font></a><font size=1 face="Arial">
|<b><br>
Address:</b> 1660 Scenic Ave. Costa Mesa, CA 92626 <br>
</font><font size=1 color=blue face="Arial"><u><br>
</u></font><a href="mailto:How%20am%20I%20doing?%20Please%20e-mail%20my%20manager%20with%20any%20feedback%20at%20Bruce.Ford@Schneider-Electric.com"><font size=1 color=blue face="Arial"><u>How
am I doing? Please e-mail my manager with any feedback at: Jim.Houlik@Schneider-electric.com</u></font></a><font size=1 color=#00a000 face="Arial"><br>
*** Please consider the environment before printing this e-mail</font><font size=1 face="Arial">
</font>
<br>
<br>
<br>
<table width=100%>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">From:</font>
<td><font size=1 face="sans-serif">Drake <drake.chamberlin@redwoodalliance.org></font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">To:</font>
<td><font size=1 face="sans-serif">RE-wrenches <re-wrenches@lists.re-wrenches.org>,
</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Date:</font>
<td><font size=1 face="sans-serif">05/20/2014 07:24 AM</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Subject:</font>
<td><font size=1 face="sans-serif">[RE-wrenches] Modified sine deterioration</font>
<tr valign=top>
<td><font size=1 color=#5f5f5f face="sans-serif">Sent by:</font>
<td><font size=1 face="sans-serif">"RE-wrenches" <re-wrenches-bounces@lists.re-wrenches.org></font></table>
<br>
<hr noshade>
<br>
<br>
<br><font size=3>Hello Wrenches,<br>
<br>
We are diagnosing a system with a 20 year old Trace DR 1512 inverter. Recently
a motor burned out that had been running on the system. I do understand
that modified sine (modified square) wave inverters are hard on motors
in general.<br>
<br>
My question is, "does the quality of the Mayan Pyramid sine wave deteriorate
with time as the capacitors dry up, or for any other reason? Would
the power quality be expected to have declined on an old unit like this?<br>
<br>
Thanks,<br>
<br>
Drake <br>
<br>
Drake Chamberlin<i><br>
Athens Electric LLC<br>
OH License 44810<br>
CO License 3773<br>
NABCEP Certified Solar PV <br>
740-448-7328</i></font><font size=3 color=blue><u><br>
</u></font><a href="http://athens-electric.com/"><font size=3 color=blue><u>http://athens-electric.com/</u></font></a><font size=3>
<br>
<br>
<br>
______________________________________________________________________<br>
This email has been scanned by the Symantec Email Security.cloud service.<br>
______________________________________________________________________</font><tt><font size=2>_______________________________________________<br>
List sponsored by Home Power magazine<br>
<br>
List Address: RE-wrenches@lists.re-wrenches.org<br>
<br>
Change email address & settings:<br>
</font></tt><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org"><tt><font size=2>http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</font></tt></a><tt><font size=2><br>
<br>
List-Archive: </font></tt><a href="http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org"><tt><font size=2>http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org</font></tt></a><tt><font size=2><br>
<br>
List rules & etiquette:<br>
</font></tt><a href="www.re-wrenches.org/etiquette.htm"><tt><font size=2>www.re-wrenches.org/etiquette.htm</font></tt></a><tt><font size=2><br>
<br>
Check out participant bios:<br>
</font></tt><a href="www.members.re-wrenches.org"><tt><font size=2>www.members.re-wrenches.org</font></tt></a><tt><font size=2><br>
<br>
</font></tt>
<br>
<br>