Rob F.
Diamond
- Joined
- Aug 5, 2012
- Location
- California, Central Coast
I recently got a new to me lathe (Nebel 1308) that is has a 440 only motor in it. I dont have much experience with step up transformers so am looking for a little guidance.
I've been reading old posts about transformers and running them "backwards". It has been mentioned that the voltage might increase more than 2X when feed in the output. My voltage can be between 238-246 depending on POCO.
Looking at step down from 480 to 120/208, 15 KVA and 480/240/120, 9 KVA. Seller thinks they are delta, but is away from them for a while. Should I go with a 480 to 240 knowing the 240 will be stepped up more than 480? If feeding 246v I imagine transformer getting really close to 500v output, seems to high to me but... If the xfmr does not have ability to change wires to tune the voltage should I just pass on them?
The 3 phase for this would come from a 15hp RPC. Lathe has a 5hp motor. Here is a pic of them, will know more later today.
2kva per motor hp would put me just about right with the 9kva unit. 3 or 4 hrs round trip drive to get it so would like to know as much as possible before a long drive...
I've been reading old posts about transformers and running them "backwards". It has been mentioned that the voltage might increase more than 2X when feed in the output. My voltage can be between 238-246 depending on POCO.
Looking at step down from 480 to 120/208, 15 KVA and 480/240/120, 9 KVA. Seller thinks they are delta, but is away from them for a while. Should I go with a 480 to 240 knowing the 240 will be stepped up more than 480? If feeding 246v I imagine transformer getting really close to 500v output, seems to high to me but... If the xfmr does not have ability to change wires to tune the voltage should I just pass on them?
The 3 phase for this would come from a 15hp RPC. Lathe has a 5hp motor. Here is a pic of them, will know more later today.
2kva per motor hp would put me just about right with the 9kva unit. 3 or 4 hrs round trip drive to get it so would like to know as much as possible before a long drive...
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