I was working on a 30 Ton Trane Voyager. It was tripping on high pressure. It has two compressors and three condenser fans. Fan #3 was running back wards and pulling high amps on one leg. the fan motors are 460 V. 1 Ph. When two of the fans are running, the third fan is spinning back wards and when it is powered, it runs back wards. I replaced the motor and capacitor for fan #3 and cleaned the condenser coil good. When I ran it in test mode and brought on compressor #2 which starts fan #3, it still ran back wards. In fact, if you power any two fans and then power the last fan, it will run back wards.
But after replacing the one motor, if you let the unit run in normal mode, which is Tracer, all motors run the right direction. This is because when it calls for the 2nd stage of cooling, the 1st stage goes off for a few seconds which lets the fans slow down, then both contactors pull in and everything runs fine. This building has two of the same units and they both operate this way. Have you guys seen this before and is there a good fix to keep the fans from spinning back wards when not in use.