[RE-wrenches] How to find Ground fault on ungrounded system.

[Peter Giroux]

Darryl

    Have had some issues with Primo's, first solution turned out to be a software upgrade as Fronius had set parameters pretty tight. Second turned out to be a very old AC compressor, when it kicked on it some how triggered the Primo and showed a fault. While I am not commenting on your Megging, the above issues were corrected.

peter 
  ----- Original Message ----- 
  From: Darryl Thayer 
  To: newrewrenches 
  Sent: Saturday, August 18, 2018 1:40 AM
  Subject: [RE-wrenches] How to find Ground fault on ungrounded system.


  The system is Fronius Primo, trip on fault code meaning ground fault in the array.    I disconnect the arrays from the combiner it measures  400+ corresponding to Voc 
  @ temp.  My Fluke multimeter the same about 5 volts to ground off both ends of the disconnected array.  When I connect the inverter and set into operation I measure a difference of voltage to ground.   The tech support at Fronius says it can't be the inverter.  Is the problem in the array?  Or the inverter?


  If I meg the array, my procedure is to open circuit the array and connect my negative lead to ground and my positive lead of the Megger. to the negative lead of the array.  please comment on my megging practice.      


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