I'm trying to determine what all my options might be to provide correct and balanced voltage to my Tree 325 CNC knee mill, from an RPC. I am hoping for some basic info about what is possible with 3-phase (or 3 single-phase) transformers.
1. Are 3-phase transformers typically built such that each phase coil could be tapped for a different voltage input?
2. In the case of supplying unbalanced voltage from a 3-phase source to a 3-phase transformer, does the transformer have any mediating effect on the unbalanced voltages between legs, or are the phases essentially independent within the transformer flux?
3. Would using a transformer on the output of an RPC create any oddball effects for the RPC, or other machines using the RPC output directly?
I have a commercially-built RPC that is feeding my shop, and no specific documentation for the unit (came with the CNC mill), and I can't afford a lot of "R&D" downtime sorting out the phase converter right now. I did get some good input previously about remedy for the specific balance issue, but it does involve dismantling the RPC and swapping caps in and out, so I haven't wanted to disable my shop power up to this point.
I have 240V residential supply coming in around 242V, and one leg of the RPC is working at about 265V. The Tree mill wants 230V +/- 5%; I would like to get pretty close to nominal, so I know that the power is not the problem while I'm trying to get the Tree servo/spindle drive back into operation.
1. Are 3-phase transformers typically built such that each phase coil could be tapped for a different voltage input?
2. In the case of supplying unbalanced voltage from a 3-phase source to a 3-phase transformer, does the transformer have any mediating effect on the unbalanced voltages between legs, or are the phases essentially independent within the transformer flux?
3. Would using a transformer on the output of an RPC create any oddball effects for the RPC, or other machines using the RPC output directly?
I have a commercially-built RPC that is feeding my shop, and no specific documentation for the unit (came with the CNC mill), and I can't afford a lot of "R&D" downtime sorting out the phase converter right now. I did get some good input previously about remedy for the specific balance issue, but it does involve dismantling the RPC and swapping caps in and out, so I haven't wanted to disable my shop power up to this point.
I have 240V residential supply coming in around 242V, and one leg of the RPC is working at about 265V. The Tree mill wants 230V +/- 5%; I would like to get pretty close to nominal, so I know that the power is not the problem while I'm trying to get the Tree servo/spindle drive back into operation.