Centroid Community CNC Support Forum

I have have a Matsuura MC1000 VMC, built 1980, i'm starting the process of upgrading the Fanuc to Centroid, i bought the AC/DC-60 Drives, the Servo motors are rated at 128vdc and 33 amp continues, i'm using the DIOCAP3P 3 phase rectifier from Centroid, i cant figure the KVA out, what size transformer do i need?

Please see this Tech Bulletin for how to calculate it and some examples:
http://www.centroidcnc.com/dealersuppor ... ds/161.pdf

Your machine specific components will no doubt be a bit different.

Thank you,

in my case its multiple transformers, Y and Z axis being 128 Vdc 33 Amp, X axis being 92 Vdc 24 Amp, the original SCR drives had individual transformers for each axis, 5 kva, secondary voltage 90 for x, 120 for Y and Z,
my problem is, i can't find transformers with 90 vac secondary for my Y Z Drives(127.26 = 1.414 x 90).
Hydraulic pump, Coolant pump, Spindle Cooler, Spindle Drive, and lube pump all operate at line voltage(200-220v),

I should clarify my question, if my rectifier output is 128vdc 33amp, the input should be 3 phase 90.5vac and ???amp.

does the fact that i'm rectifying 3 poles to single pole, drop my required ac side amperage?

perhaps the title of this post should be: 3 phase rectifier, supply current calculation.

Can you use the original Fanuc transformer(s)?

1 is a multi tap, with 3 taps 60 90 120 volt secondary, the other 2 transformers look the same but is a different revision, all 3 taps are labeled and measured 120 volt.