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I had previously spoke to an applications engineer about the LEM current sensors. He did tell me that the voltage increases linearly with the same slope once you exceed the continuous rating of the sensor up to the max limit which I believe is +/-900 amps for the 300, 500 and 600 amp sensor.
I am running my LEM500 with a small PIC chip and LCD display. I haven't had any problems. However, I am not running your controller (yet!!!) and maybe it is not producing as much EMI. It is also a stand alone system and not part of the controller. I plan on incorporating it into my BMS in the next few days.
Rick
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