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Amin, what sort of contactor do you have? Do you know if it has an economizer? Are you powering the control board with an auxiliary battery or a DC-DC? Do you have a diode across the coil of the contactor? Um... I can't think of anything else.
Another fault that I added is if you give it throttle when the contactor is open, when the pwm goes to 100% and the current feedback is zero, it gives a fault. I would check to see if Q1 is bad. If it is, your coil may not have an economizer on it?
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