[RE-wrenches] Drop mode: who needs it?

[William Miller]

Friends:



I have a customer who was basically victimized by a shady installer (who is
no longer in the business).  He was sold an undersized system with two
VFX3648 inverters and later two FX2548 inverters.  One of the 2548s died
and it was recommended I install all new boards.  I am a bit disappointed
that there was no option to try and figure out which board was bad, I had
to install all three.



I was told the logic board has newer firmware and had to be configured as
the master.  I did so and we found that there was a glitch:  About 5
seconds before an auto-start the AC Use/Drop screen went to Drop mode.  The
generator started but ran for no benefit.  We resolved this by
reconfiguring the system so an older VFX inverter was master and resetting
all units.



I have three questions:



1.    Is there any known incompatibilities between versions of logic boards?

2.    Is there a way to determine which board is defective and replace only
that board?

3.    What possible use could the drop mode have and why is it even
included in the menu structure?  Can’t one just open a circuit breaker and
achieve the same effect?



Any help is much appreciated, as always.



Sincerely,



William Miller







[image: Gradient Cap_mini]
Lic 773985
millersolar.com <http://www.millersolar.com/>
805-438-5600
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