M. Moore
Titanium
- Joined
- Jun 8, 2007
- Location
- Vancouver Island, B.C. Canada
I have a mystery problem.
I have 120-208 volt three phase coming into the building.
I installed a 120/208 to 480 volt 30kva transformer to run my large roller.
At the time I installed a 30 amp 3phase breaker to run the transformer from the 120/208 panel.
This worked well and perfectly for a few years. Then I needed to upgrade the panel and I also needed to run my 480 volt plasma machine from the same transformer. The wires are sized correctly for the load. I have an electrician friend that does most of the work and I just help with the grunt work.
We upsized the breaker to a 50 amp from the main panel and that is when the trouble began. The breaker trips every time I turn on the transformer. It happened the very first time and there was no load on the transformer. Reset the breaker once or twice until it will stay and then it is fine? Why is this happening?
It is very annoying to buy a $300 breaker and have it perform this way. The 30 amp breaker did not trip. The transformer is controlled by a mag switch which uses a separate 120 volt circuit for the coil. Also the first 50 amp breaker was returned and replaced as we thought it the culprit. Seimens brand equipment.
Any ideas from all you electron experts?
Thanks!
Michael
I have 120-208 volt three phase coming into the building.
I installed a 120/208 to 480 volt 30kva transformer to run my large roller.
At the time I installed a 30 amp 3phase breaker to run the transformer from the 120/208 panel.
This worked well and perfectly for a few years. Then I needed to upgrade the panel and I also needed to run my 480 volt plasma machine from the same transformer. The wires are sized correctly for the load. I have an electrician friend that does most of the work and I just help with the grunt work.
We upsized the breaker to a 50 amp from the main panel and that is when the trouble began. The breaker trips every time I turn on the transformer. It happened the very first time and there was no load on the transformer. Reset the breaker once or twice until it will stay and then it is fine? Why is this happening?
It is very annoying to buy a $300 breaker and have it perform this way. The 30 amp breaker did not trip. The transformer is controlled by a mag switch which uses a separate 120 volt circuit for the coil. Also the first 50 amp breaker was returned and replaced as we thought it the culprit. Seimens brand equipment.
Any ideas from all you electron experts?
Thanks!
Michael