I installed a phase monitor so if the voltage goes to low/high/missing it should trip. Do you know of any line monitor systems? Both elevators share buss bars in the electrical room so I feel it should be a power issue with both cars not just the one. This is also why I will be swapping the L1L2L3 connection at the controllers and trying to get the problem to switch cars. This still wont answer why its happening though. I run the car all day with meter and amp probe and looking at the soft start power but everything looks in order. Lowest voltage I see is 479Vac. With a difference of 7-10V between lines