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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