Richard-B
Plastic
- Joined
- Aug 7, 2019
- Location
- South Australia
G'day,
I originally asked a question in the following thread but I was advised to open a new thread with my question. The original is here - Rotary phase converter won't start Monarch 12C
The basis of the question was that the OP couldn't run his 3 phase machine on his rotary converter. He tried a few things, including removing the motor and having it bench checked and then he replaced it and it seemed to work OK. The thread didn't come to a conclusion as to what the original problem was.
During the trouble shooting though, it was asked if he had a transformer in his RPC. Apparently, because Australia has single phase @ 240v with only a "live" and a "neutral", we need a transformer to step it up to 415v prior to the RPC. He said he doesn't have a transformer because they are too expensive. He also mentions he runs a larger 7.5 hp machine with no problem.
So I am confused as to how he is running his 7.5 hp machine on a DIY converter without a transformer.
Here is a video from an Australian RPC manufacturer. He measures the Voltage drop between two of the phases and gets 415v, then he measures between a phase and neutral and gets 240v. So if he was to measure an RPC made in the states, he would get 240v between the phases and 120v between a phase and neutral...is that correct? YouTube
So if I have my head around it... the 3 phase motors in the States run on 3 phases of 240v and in Australia we run 3 phase motors on 3 phases of 415v...yes?
Sorry for the long post and multiple questions, I have spent the last three days on the PC trying to figure this out and I seem to be going down the hole after the rabbit.
I originally asked a question in the following thread but I was advised to open a new thread with my question. The original is here - Rotary phase converter won't start Monarch 12C
The basis of the question was that the OP couldn't run his 3 phase machine on his rotary converter. He tried a few things, including removing the motor and having it bench checked and then he replaced it and it seemed to work OK. The thread didn't come to a conclusion as to what the original problem was.
During the trouble shooting though, it was asked if he had a transformer in his RPC. Apparently, because Australia has single phase @ 240v with only a "live" and a "neutral", we need a transformer to step it up to 415v prior to the RPC. He said he doesn't have a transformer because they are too expensive. He also mentions he runs a larger 7.5 hp machine with no problem.
So I am confused as to how he is running his 7.5 hp machine on a DIY converter without a transformer.
Here is a video from an Australian RPC manufacturer. He measures the Voltage drop between two of the phases and gets 415v, then he measures between a phase and neutral and gets 240v. So if he was to measure an RPC made in the states, he would get 240v between the phases and 120v between a phase and neutral...is that correct? YouTube
So if I have my head around it... the 3 phase motors in the States run on 3 phases of 240v and in Australia we run 3 phase motors on 3 phases of 415v...yes?
Sorry for the long post and multiple questions, I have spent the last three days on the PC trying to figure this out and I seem to be going down the hole after the rabbit.