From: Subrahmanya Ramakrishnan
Sent: Tuesday, May 09, 2006 3:52 PM
To: Wayne T. Reiersen; Bradley E. Nelson; David E. Williamson; Geoffrey
J. Gettelfinger; James H. Chrzanowski; Michael R. Kalish; Thomas G.
Brown
Cc: Charles L. Neumeyer; Frank Jones; Richard J. Van Kirk; Gene Baker;
Alfred von Halle
Subject: FW: NCSX Coil identification

Hi
Earlier I had sent a note regarding proper coil identification scheme. I would like to add that a color coding scheme be also adopted (in addition to proper numbering) for all coil terminals and terminations. Following is proposed:
RED : POSITIVE TERMINAL (EITHER PAINT OR PROVIDE RED TAPE)
BLACK : NEGATIVE TERMINAL (EITHER PAINT OR PROVIDE BLACK TAPE)
GREEN : GROUNDING TERMINAL (EITHER PAINT OR PROVIDE GREEN TAPE)
With the above scheme we will avoid spending unnecessary time and money to identify polarities.
We propose to incorporate this scheme of identification in all electrical drawings.
Raki

-----Original Message-----
From: Subrahmanya Ramakrishnan 
Sent: Thursday, April 27, 2006 4:36 PM
To: Wayne T. Reiersen
Cc: Charles L. Neumeyer; Alfred von Halle
Subject: NCSX Coil identification

Wayne
I would like to suggest that the Modular coils be numbered as MA, MB, MC instead of M1, M2 & M3. We can then sequentially number each with their six sub-coils as MA 1 through 6 etc.
Hopefully the coils are being positioned in the machine in a clockwise direction - viewing from the top - in sequential fashion.
Raki

Wayne
I would like to clearly identify coil terminals (for each coil) of NCSX. Even though I could look at several mechanical drawings, I am unable to see what the actual lead markings are. If not already done, I would suggest the following:
1. Modular Coils:
I understand there are three modular coils M1, M2 & M3. Each of these three modular coils, have six sub-coils in series. If not already numbered it can be labeled M1a, M1b, M1c, M1d, M1e, and M1f. Alternatively we can also label them as M11, M12, M13, M14, M15, M16. Each of the sub-coil leads are also to be labeled. Typically it can be labeled as M1as and M1af OR M11s & M11f depending on how we number the coils. The suffix "s" denotes "Start" and suffix "f" denotes "Finish". (Alternatively we can also call them as M1ap & M1an OR M11p & M11n - "p" for Positive and "n" for Negative.)
2. Other Coils
A similar numbering scheme is also required to be adopted for other coils. In case of TF, I understand that there are 18 coils and they can be numbered sequentially - as is the standard practice. Each coil lead shall be labeled as "Start" , "Finish" OR "Positive" , "Negative"

3. Designation of coil polarities:
a) PFs: Viewing from the top of the machine, if the current flow in the coil (PFs) is in the clockwise direction, the current entering the terminal is to be designated as "Positive". 
b) TF: Viewing from the top of the machine if the current flow in the center portion of TF is in the downward direction, the current entering the terminal is to be designated as "Positive".

4. Potential leads from coil terminals:
As suggested it is prudent to take the coil resistance measurements. In order to facilitate the same we have to bring out leads from the coils (we can call them "Potential Leads") to a central location each of the potential lead shall also be properly labeled as say PM1as, PM1af OR Pm1ap, PM1an as the case may be.

I would be glad to discuss the above with you if required. If you have already assigned appropriate identification please let me know.

Raki