Hello All,
New to this forum and new to what I what I need.
I own & operate 'Consumer & Industrial' electronics service shop, with a goal to reverse the name to 'Industrial & Consumer' and that goal appears to be closer now.
More and more VFDs end up on my bench that is 240v single-phase, but they call for anything from 120 to 480V, there is a need to service DC p.supplies that call for higher 1 or 3-phase inputs as well.
Done some studies and trolled different sources and it appears to me that I need rotary converter, I understand that a 100% balanced output is impossible to achieve but I think for my applications (with some exceptions) i should suffice.
I though about a following set up:
240V; step-up trafo; 480V ; rotary converter 3 X 480v; variable 3-phase autotransformer; load
But I just found in Volpac catalog 3-phase Wye 240V input 0-560V Output that would eliminate need for step-up trafo.
My understanding is that if a piece of three-phase equipment (VFD, Power Supply etc.) operates only on phase-to-phase voltages, it does not matter whether the power is configured as wye or as delta the load does not know or care where ground/neutral is in reference to any of the phases. It only ?sees? the relationship between the phases. So if you reference the three voltages of wye power and ?erase? the connection to ground/neutral, you have a triangle, the same as in delta configured power.
But I have a problem what to do with that 'neutral' from autotransformer, should I ground it to the converter, protective ground on the load, both?
In some Fanuc or Siemens controls though regenerative power from the spindle motor is put back onto the line utilizing a phase-to-neutral connection on all three legs. So in this case I guess I would use that neutral connecting it to common/neutral point on autotransformer? , another gain cause I wouldn't have to use delta to wye transformer..
But it sort of looks to good.
I would appreciate you insight here, although electrical Eng. by education I never worked in that field and my recollection of what I learned many decades ago is pretty foggy.
Thanks,
Kaz
New to this forum and new to what I what I need.
I own & operate 'Consumer & Industrial' electronics service shop, with a goal to reverse the name to 'Industrial & Consumer' and that goal appears to be closer now.
More and more VFDs end up on my bench that is 240v single-phase, but they call for anything from 120 to 480V, there is a need to service DC p.supplies that call for higher 1 or 3-phase inputs as well.
Done some studies and trolled different sources and it appears to me that I need rotary converter, I understand that a 100% balanced output is impossible to achieve but I think for my applications (with some exceptions) i should suffice.
I though about a following set up:
240V; step-up trafo; 480V ; rotary converter 3 X 480v; variable 3-phase autotransformer; load
But I just found in Volpac catalog 3-phase Wye 240V input 0-560V Output that would eliminate need for step-up trafo.
My understanding is that if a piece of three-phase equipment (VFD, Power Supply etc.) operates only on phase-to-phase voltages, it does not matter whether the power is configured as wye or as delta the load does not know or care where ground/neutral is in reference to any of the phases. It only ?sees? the relationship between the phases. So if you reference the three voltages of wye power and ?erase? the connection to ground/neutral, you have a triangle, the same as in delta configured power.
But I have a problem what to do with that 'neutral' from autotransformer, should I ground it to the converter, protective ground on the load, both?
In some Fanuc or Siemens controls though regenerative power from the spindle motor is put back onto the line utilizing a phase-to-neutral connection on all three legs. So in this case I guess I would use that neutral connecting it to common/neutral point on autotransformer? , another gain cause I wouldn't have to use delta to wye transformer..
But it sort of looks to good.
I would appreciate you insight here, although electrical Eng. by education I never worked in that field and my recollection of what I learned many decades ago is pretty foggy.
Thanks,
Kaz