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Success. Controller works fine after repair. I replaced all the mosfets, whole power board and two diodes. Now voltage goes to 144V during precharge and even voltage sag seems to have lowered.
Question: for how long should caps remain charged? My previous controller lost cap charge in few seconds after opening the main contactor. Rebuilt controller holds charge for minutes and voltage decreases very slowly. Could that quick voltage drop have hinted me of developing short?
Last edited by mora; 03-06-2012 at 03:34 PM..
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