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I think it would just go from max amps to zero amps really fast. if it was an open revolt, it would just keep trying to command current that is proportional to the throttle. But zero amps would go through. That would then ramp up the pwm duty to 100%. The newer software would then flag a fault because of the 100% duty/zero current scenario. You would have to lift your foot off the throttle to clear the fault. Older software would just ramp up the duty to 100%. Then, if you suddenly opened the contactor, the controller would act almost like a dead short and if the overcurrent doesn't come on fast enough, things could blow up.
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