Hi I have an older Mitsubishi Z300 spindle drive in a Fadal 4020 and im getting an occasional undervoltage alarm while the spindle is ramping up or taking a heavier cut. Only seems to happen when the grid levels are on the lower side (I see about 233-244 single phase in my area).
What should the max DC bus voltage be? Right now im seeing a range of 318-328 with machine idle, depending on grid. I think transformer is tapped for 250v (I was recommenced to set voltage on lower side). Do I have room to safely tap it at 240?
Also, this has been running fine for years and problem seems to be more common lately. Could the capacitors be loosing some of their capacity? What would replacements typically cost for a 7.5kw drive? Anybody have ballpark idea?
What should the max DC bus voltage be? Right now im seeing a range of 318-328 with machine idle, depending on grid. I think transformer is tapped for 250v (I was recommenced to set voltage on lower side). Do I have room to safely tap it at 240?
Also, this has been running fine for years and problem seems to be more common lately. Could the capacitors be loosing some of their capacity? What would replacements typically cost for a 7.5kw drive? Anybody have ballpark idea?