Hi,
I have a Mikron WF51 CNC milling machine, the machine is in excellent mechanical condition but the original Siemens controller is not working. Instead of finding out what's wrong with the controller, I am freeing myself of future controller related headaches and converting the machine to run with mach3. Because the original servo drives are analog drives, they have to be changed by digital ones, I bought a VSD-XE drive from Granite devices. The sevo's on the machine have a voltage rating of 167V and a current rating of 11.5A. So I figured I needed quite a big power supply to run 3 such servo's, luckily I had a big transformer laying on the shelves that could possibly do the job. The transformer is a 3 phase 380V/120V with a power rating of 6500VA. 380V used to be the voltage for 3phase power in Belgium, but it has changed to 400V a couple of years ago. This means the AC output voltage of my transformer would become 126VAC and when rectified 178VDC, this is 18V more then the 160Volts maximum of the VSD-XE drive. Is this allowed? And when not, is there an other solution than buying/building a 3 phase controlled rectifier to reduce the voltage? Does a higher input voltage reduce the regenerative braking power of the drive.
Thanks
Jonathan