I found the LQ1 had no functional local display. This control board is new and was first recently installed on the RQ1, when we had some miswiring and burnt up some bridge rectifiers on the internal 24V supply. At that point the LD1 LED on the control board would blink on and off. We were not sure if that was ok. The LD1 on the board in the LQ1 was on steady. I guess it was a sign something was wrong, not just a change in programming. In the end the LD1 LED was just off. I installed one of the other new control boards. While ramping the supply up it became clear the current draws on the 480VAC inputs were not right. It would appear the firing circuit is suspect on the LQ1. I put an admin lock on it. The LQ2 and LQ3 both went to 1600A without any apparent problem. The LQ2 had some problem with changing polarity. The LD1 went to 750A without a problem. I left LQ2 and LQ3 sitting at 300A, and LD1 sitting at 200A. The RQ1 looks to be in good shape, better than the LQ1 for certain. The RQ3 would only go to just shy of 1200A. The RQ2 was showing some instability over 1400A. I left both RQ2 and RQ3 sitting at 300A. The RD1 showed it was set for positive particles. I found the polarity reversal switch set for positive, the switch on the front panel set for positive, the compensating coil set for positive, but the voltage sense leads cables plugged into the box for negative up by the magnet leads. I set all switches for negative and put my lock out lock on the 480VAC wall switch.