[RE-wrenches] Fronius State 104
Kent Osterberg
kent at coveoregon.com
Mon Oct 8 18:38:11 PDT 2012
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
>
>
> Jeff Wongstrom
> NABCEP Certified
> 406.291.3416
> thirstylakesolar.com <http://www.thirstylakesolar.com>
>
>
>
>
>
>
>
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