Blown g201 is it the motor?

Hello There seems to be a problem with the set up that I have on a
machine. There is 208 3 ph (Delta) going to a transformer. The
transformer is single phase with two legs of the 208 on the primary
side of the trans. coming off from secondary side I am getting 53 VAC
which I have both legs fused. after the fuse there are three full
wave rectifiers. From the rectifiers all the positives are conected
to all the positives and all the negitives are hooked to all the
negitives, ground and the ground of the drive. the power from the
caps goes through a fuse to than a drive with a voltage of 76 volts.

I have this same setup on an other machine and it works well...

Here is what happend
I hooked up the Z moved it up and down worked very well
then power down
Hooked up the X moved very welll
then power down
Hooked up the Y turn on the power and there goes a drive and it blew
a fuse The drive died and the 10amp fuse blew going to the
rectifiers. the 3amp fuse at the drive did not blow (May be a slow
blow) .
The x and z drives are still working very well when I took the Y
drive out.

The drive reads a dead short from the Power ground pin to the 24 -
80v pin as well one of the motor coil pins The enable / disable pin
from the y drive if hooked up (No power) will disable the other
drives. (It didn't do that before)

What I need to know is what will cause that failure to happen. I
DON'T want to hook up an other drive (I have others on other
machines) because it blew on power up. So what will make this happen
I have checked and there is no coil to ground fault that I can read.
the motors are Bridgeport series 2 steppers and with 40V I can get 30
in per min and at 74 I get 70 in per min (I like the higher voltage).


Thank you for your input
Brian