scope:

Specifies the factory acceptance vibration test procedures and vibration limits for certain electrical machines under specified conditions, when uncoupled from any load or prime mover. Is applicable to d.c. and three-phase a.c. machines, with shaft heights 56 mm and higher and a rated output up to 50 MW, at operational speeds up to 15 000 per minute. The significant technical changes with respect to the previous edition are: a) reduced vibration levels of new machines during factory acceptance tests; the new levels are based on a combination of displacement, velocity and acceleration rather than only velocity; b) the speed range is extended; c) the number of shaft-height ranges is reduced; d) a procedure for testing vertical motors has been introduced