I having problems with the primary side of the control transformer blowing after about a one minute delay
Main 60 amp line fuses are good. Checked and eliminated all possible and potential causes that I can see. Its 3 phase supply power, indoor fan motor is not single phasing equal amps and volts, compressors were ohmed and checked to ground, one or both of crankcase heaters was thought to have been the problem as I disconnected them during the troubleshooting and finally got the unit to run. I protected the primary side of the transformer with inline .5 amp fuses, however when I returned the fuses where blown again. I then changed the two contactors that are the pickup points for the power supply from the fuse block and once again the fuses blew.
This ones got me stumped. I meeting an electrician on site to help prove proper, stable main power