[RE-wrenches] Fronius State 104

[Kent Osterberg]

Jeff,

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.

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?

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.

Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882

On 10/9/2012 9:20 AM, Jeff Wongstrom wrote:
> Kent,
>
> 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.
>
> 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+.
>
> Jeff
>
>
>
> Jeff Wongstrom
> NABCEP Certified
> 406.291.3416
> thirstylakesolar.com <http://www.thirstylakesolar.com>
>
>
>
>
>
> On Oct 8, 2012, at 7:38 PM, Kent Osterberg wrote:
>
>> Jeff,
>>
>> Is there any chance the utility has recently implemented a remote 
>> meter reading system? The Aclara TWACs 
>> <http://www.aclaratech.com/AclaraPLS/specsheets/TWACS_UMT-R.pdf> 
>> 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.
>> Kent Osterberg
>> Blue Mountain Solar, Inc.
>> www.bluemountainsolar.com
>> t: 541-568-4882
>> On 10/8/2012 9:34 AM, Jeff Wongstrom wrote:
>>> Hello wrenches,
>>>
>>> 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.
>>>
>>> Any suggestions or recommendations?
>>>
>>> Thanks,
>>>
>>> Jeff
>>>
>>> <Mail Attachment.jpeg>
>>> Jeff Wongstrom
>>> NABCEP Certified
>>> 406.291.3416
>>> thirstylakesolar.com <http://www.thirstylakesolar.com/>
>>>
>>>
>>>
>>>
>>>
>>>
>
>

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org/attachments/20121009/cfea2f33/attachment-0004.html>