| 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 WongstromNABCEP Certified 406.291.3416
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
<Mail Attachment.jpeg>
Jeff Wongstrom
NABCEP Certified
406.291.3416
|
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