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Adam is right, I had seen the sharp changes in the graph when I touched one of the wires going to the 5K (PB6) pot, and corrected that. That may have been the original problem of not starting at very low temperatures, but it did not close the contactor after tightening the connection.
I did not save the cvs file after I had redone the connection, but it was still not closing the contactor. There was no 12 volts at the contactor wire after the precharge time.
Should the output of U9 go to 0 volts when the precharge is complete, to trigger Q1?
Amin
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