[RE-wrenches] Fronius State 104

[Jeff Wongstrom]

All,

The utility(Flathead Electric Co-op) has recently completed automatic meter reading using a power line carrier for all co-op members.  I will give them a call to find out the type and frequency of signaling. The state 104 has been occurring within 10 minutes of connecting to the grid.  Perhaps the IG uses the zero crossing and is confused by the meter reading signal.  

I have talked with Fronius and it looks like they may send an IG+ as an upgrade.  Perhaps the IG+ does not get confused by meter reading signals. Fingers crossed. If it does go into state 104 maybe opening up the frequency window will help.

We have no other inverters on this utility for comparison and have had no feedback on the hand full of grid-tied systems out there.

Thanks for the valuable input,

Jeff


Jeff Wongstrom
NABCEP Certified
406.291.3416
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 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
>> 

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