revision history
1. Original release - 02/2008.
2. Revision 07/2008 - Updated with E-stop info.
3. Revision 09/2008 - Updated replacement parts and BOM.
4. Revision 04/2009 - Updated replacement parts and BOM.
5. Revision 06/2010 - Updated Recommended input conductor and line fuse sizes, section 3.4.1.
6. Revision 01/2011 - Updated Recommended input conductor and line fuse sizes, section 3.4.1.
7. Revision 09/2011 - updates per M. Wright's mark-up.
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