FirstEliminator
Cast Iron
- Joined
- Jul 4, 2007
- Location
- North Adams, Massachusetts
Hey guys,
I recently bought a machine. It's an oil purifier made by Pall, model HVP-902. This machine was originally designed to operate on 220 3 phase. Sometime in it's life the operating voltage was changed to 480 3p. It's no big deal to switch voltage on the motor and reconfigure the step down transformer for the electronics that run on 110. I determined I need to replace the main breaker which is 50 amps at 480v. There are also some contactors that may have been changed. As I was researching what I might need to get, I had called the company and spoke with guy that had originally built this particular unit. He had asked if the heating element had been changed. I said yeah, it is set up for 480. Well, the special heating element for 220v in this oil purifier is 10 times what I paid for the unit itself. So no, it seems the path of least resistance (or cheapness) is to change back the wiring I altered and use a transformer to step up from 208 3p to 480 3p somewhere in the 15 to 30kva range. The machine calls for 53 full load amps at 220 so 15kva is the smallest I can go with. I prefer to stay around 20KVA to get away with a 100 amp breaker.
The problem I am having is I can find a bunch of transformers that step down from 480 to 208. But, I can't seem to find one that steps up. Can one of those 480 down to 208 be reversed to act to step up voltage?
thanks in advance,
Mark
I recently bought a machine. It's an oil purifier made by Pall, model HVP-902. This machine was originally designed to operate on 220 3 phase. Sometime in it's life the operating voltage was changed to 480 3p. It's no big deal to switch voltage on the motor and reconfigure the step down transformer for the electronics that run on 110. I determined I need to replace the main breaker which is 50 amps at 480v. There are also some contactors that may have been changed. As I was researching what I might need to get, I had called the company and spoke with guy that had originally built this particular unit. He had asked if the heating element had been changed. I said yeah, it is set up for 480. Well, the special heating element for 220v in this oil purifier is 10 times what I paid for the unit itself. So no, it seems the path of least resistance (or cheapness) is to change back the wiring I altered and use a transformer to step up from 208 3p to 480 3p somewhere in the 15 to 30kva range. The machine calls for 53 full load amps at 220 so 15kva is the smallest I can go with. I prefer to stay around 20KVA to get away with a 100 amp breaker.
The problem I am having is I can find a bunch of transformers that step down from 480 to 208. But, I can't seem to find one that steps up. Can one of those 480 down to 208 be reversed to act to step up voltage?
thanks in advance,
Mark