On Wed, 28 Jul 2021 at 18:00, Earl Weaver <[email protected]> wrote:
> I have noticed if the main power disconnect switch is let on the machine > for a length of time, the motor will feel hot to the touch. > Is this normal? Yes, if the field windings are permanently powered on. The motor rating plate says that the insulation is class F: "Class F insulation consists of materials or combinations of materials such as mica, glass fibre, asbestos, etc., with suitable bonding, impregnating or coating substances, as well as other materials or combinations of materials, not necessarily inorganic, which by experience or tests can be shown to be capable of operation at the Class F temperature (materials possessing a degree of thermal stability allowing them to be operated at a temperature 25 Centigrade degrees higher than Class B materials). Maximum allowed temperature: (IEC60034-1 & NEMA MG1-12.43): 155C, 311F." -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
