RonRock
Aluminum
- Joined
- Mar 18, 2012
- Location
- Underwood, IA
So I have been working on my 7.5 HP RPC. Got it starting and running well. It's an old GE motor that was very noisy on first start up. I replaced the bearings with new and now it is still a bit loud, but tolerable. I won't forget to turn it off.
Anyway I "think" that I am on the right track as far as balance is concerned. But of course have a couple questions.
Here is some of the figures that I got,
Cp Cs Cpf Vac Vab Vbc Ia Ib Ic L1A L2A
100 50 0 240 247 249 10 13 9 5 5
100 90 0 240 245 261 7 16 13 4 4
100 90 20 241 246 262 7 16 13 3.8 3.8
My question is on the change in the Cs between 50 and 90 on Vbc.
From the instructions that I followed I am looking for,
Adjust Cp & Cs until Vbc~=1.10 Vac, Vab~= 1.05 Vac and Icn does not exceed motor nameplate FLA.
So it seems that 261Vbc is better, but 249 is a more balanced figure between the three legs.
Am I getting there? I'm thinking that I have it figured, but not sure which is best. I might be completely wrong!
Sorry about the way this looks, damn forum keeps formatting my post. I had the figures spread out so that they are understandable.
Anyway I "think" that I am on the right track as far as balance is concerned. But of course have a couple questions.
Here is some of the figures that I got,
Cp Cs Cpf Vac Vab Vbc Ia Ib Ic L1A L2A
100 50 0 240 247 249 10 13 9 5 5
100 90 0 240 245 261 7 16 13 4 4
100 90 20 241 246 262 7 16 13 3.8 3.8
My question is on the change in the Cs between 50 and 90 on Vbc.
From the instructions that I followed I am looking for,
Adjust Cp & Cs until Vbc~=1.10 Vac, Vab~= 1.05 Vac and Icn does not exceed motor nameplate FLA.
So it seems that 261Vbc is better, but 249 is a more balanced figure between the three legs.
Am I getting there? I'm thinking that I have it figured, but not sure which is best. I might be completely wrong!
Sorry about the way this looks, damn forum keeps formatting my post. I had the figures spread out so that they are understandable.