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<div class="moz-cite-prefix">Jeff,<br>
<br>
The TWACs signal is a nasty beast. It is low frequency and thus
very hard to filter. It seems to cause problems with a large
variety of devices. <br>
<br>
Unless someone has taken the time to check, how do they know if
the other inverters aren't offline for 5 of every 15 minutes?<br>
<br>
I think the time sync signal may be broadcast from the substation
only with no reply from the individual meters. The problems I've
seen have always been when the local meter is sending data; that
only takes a few seconds but it takes the inverter offline for
five minutes. So if you are seeing problems with the time sync
signal, I'd guess that the installation must be close to the
substation where the signal originates.<br>
<br>
<pre class="moz-signature" cols="72">Kent Osterberg
Blue Mountain Solar, Inc.
<a class="moz-txt-link-abbreviated" href="http://www.bluemountainsolar.com">www.bluemountainsolar.com</a>
t: 541-568-4882</pre>
On 10/9/2012 9:20 AM, Jeff Wongstrom wrote:<br>
</div>
<blockquote
cite="mid:5DC687FA-E865-4A08-AD69-52447D954E71@thirstylakesolar.com"
type="cite">Kent,
<div><br>
</div>
<div>I just talked with Mike in the meter department. The utility
does indeed use Aclara TWACs AMR. The meter reading signal can
vary but is usually done at midnight or it could be set to every
8 hours, 1 hour, etc. However, a time sync signal is sent every
15 minutes. This correlates with the problem inverter going
into state 104's at various times after connecting to the grid
observed from 1-11 minutes. Unfortunately I was informed that
the time sync signal can not be changed.</div>
<div><br>
</div>
<div>Mike told me that there are two or three other Fronius
inverters on their system without problems, he did not know if
they are IG or IG+.</div>
<div><br>
</div>
<div>Jeff</div>
<div><br>
</div>
<div><br>
<div>
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<div>On Oct 8, 2012, at 7:38 PM, Kent Osterberg wrote:</div>
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<div class="moz-cite-prefix">Jeff,<br>
<br>
Is there any chance the utility has recently implemented
a remote meter reading system? The <a
moz-do-not-send="true"
href="http://www.aclaratech.com/AclaraPLS/specsheets/TWACS_UMT-R.pdf">Aclara
TWACs</a> remote meter reading system communicates by
putting a pulse on the line that is very near the zero
crossing of the voltage waveform. Unfortunately the zero
crossing is easily and often used as a reference point
for frequency measurements. Devices that watch the zero
crossings are often confused by the TWACS signal. The
signal isn't there constantly -- only when the local kWr
meter has been asked to send data.<br>
<pre class="moz-signature" cols="72">Kent Osterberg
Blue Mountain Solar, Inc.
<a moz-do-not-send="true" class="moz-txt-link-abbreviated" href="http://www.bluemountainsolar.com/">www.bluemountainsolar.com</a>
t: 541-568-4882</pre>
On 10/8/2012 9:34 AM, Jeff Wongstrom wrote:<br>
</div>
<blockquote
cite="mid:F0B02063-6B99-4FDE-BA6B-96F6D48A7912@thirstylakesolar.com"
type="cite">Hello wrenches,
<div><br>
</div>
<div>We have a Fronius IG3000 that chronically and
frequently cycles into and out of a state 104(grid
frequency not within admissible range). The utility
has monitored the supply and claims to have found no
frequency or supply issues. Fronius sent a
replacement inverter but the error persists. The tie
in point was moved from the critical loads sub panel
to the main distribution panel. The state 104
persists with ALL other breakers open. A Fluke DMM
min/max function captures no frequency readings
outside of the inverter frequency window-same with
voltage readings. </div>
<div><br>
</div>
<div>Any suggestions or recommendations?</div>
<div><br>
</div>
<div>Thanks,</div>
<div><br>
</div>
<div>Jeff</div>
<div><br>
</div>
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