Persitent disconnect followed by OCP error

[kitestrings]

Help.

I'm still struggling with how to resolve a persistent "OCP" error.  I have two Classics on a 15' axial turbine.  It seems to always occur at fairly high output on the first Classic.  I shot another video of the most recent occurrence earlier today and sent it to Roy & Ryan.  In the video here's the sequence:

The last 'normal' frame is at 97V input and 32A (1717 watts).
In the next frame the Classic audibly clicks out, goes to "resting" and reads 123.3V, -0-A, -0- watts.  Aux2 - my 3-phase resistive load, set for 130V - comes 'on'.  Battery voltage is at 52.5V
next frame, 130.7V, -0-A, -0- watts, Aux2 on
next frame, 133.3V -0-A, -0- watts, Aux2 on
next frame, 134.4V -0-A, -0- watts, Aux2 on
next frame, 135.6V -0-A, 15 watts, Aux2 on
next frame, 135.7V -0-A, 5 watts, Aux2 on
next frame, 135.1V -0-A, -0- watts, Aux2 on
next frame, 124.6V -0-A, -0- watts, Aux2 fading out
next frame, 122.5V 1.1A, 58 watts, Aux2 off
next frame, 118.1V 14A, 758 watts, Aux2 off

It then goes to resting a second time, pretty much repeats the above until the voltage drops to 114V, 19A, 1023 watts.  Resumes normal operation.  About six or eight frames later the "OCP" indication appears.

There's some additional detail in discussions here:
http://midnitesolar.com/Forum/index.php?topic=2257.0

http://www.fieldlines.com/index.php/topic,148575.0.html

We thought we'd gotten it, but at this point I've removed the DC load diversion and I'm still seeing it.  If I lower the set-point to say 90 or 100V on the load bank/clipper it seems fine (except that I'm wasting energy).  It seems to be averse to a high differential between the input voltage and the battery bank.

Unloading a turbine is truly unnerving.  I'll be following up with Roy, but any ides here are welcome.  Thanks,

~ks

[boB]

I'm still not sure where your dump load is located.  I think it is on the AC side on the turbine ?

You said you have a 3 phase load I think ?

A high differential from input to output being worse for OCP would be correct.  There is more
energy stored on the high voltage DC side to be transferred down to the battery side then.
At least momentarily.

OK, but OCPs shouldn't necessarily cause the Classic to go to Resting.  Wind mode may
be a bit different than OCPs in other modes.  I'll take a look.  As I remember, a certain
amount of OCPs can happen before it goes to Resting, but that still happen pretty
fast.  i.e.  Not  seconds but more like tenths of a second IIRC.

Hmmmmm...

boB

[kitestrings]

You said you have a 3 phase load I think ?

Yes.  boB, I have six 6.8 ohm, 800w resistors; pairs in parallel wired in wye.  The only 3-phase load is this "homemade clipper", intended to hold the voltage within safe parameters for the CCs.  They are controlled off aux2 on Vin -Hi via SS relay.

I sent a couple of videos to Ryan & Roy.  It may tell you more than I can glean, but the Classic appears to go into resting, and the OCP error appears a bit later.  Thanks for your help.