I would pull the fuses on all the drives and try to power up. The larger Fanuc drives have 3 cartridge fuses and 3 1.3 A indicator fuses on the back. Pull all 6 fuses to disable the drive. The smaller drives have just 3 15 A indicator fuses. Pull those 3 fuses to disable those drives.
With the fuses removed, be sure you don't have an axis that will "drift" down when the power is on. Some vertical Z axes use a brake in the Z moter, so if the brake releases with no fuses in the drive, the Z will drift down. Block the Z axis with wood to prevent this.
With the servos disabled, power up the control and try to run the coolant pump. That should tell you if the phase rotation is correct or not. Then, check the voltage at the back of each drive unit. You should have 3-phase AC on terminals "A", "1" and "2". You should see about 120vac for model 10 and 20 motors, 90vac for model 5 motors, and 60vac for the small model "0" motors. Be sure that all three phases are there.
That should get you started.