- 11 -
3.5 Fluctuations in the power voltage and frequency
Standard: Rotation electricity machine general rules
JIS C 4034-1:1999
，
JEC-2137-2000
To the voltage change and frequency change in Domain A, in main rated values, it operates
continuously, and can be used practically convenient, and to the voltage change and frequency
change in Domain B, it shall operate with main rated values and shall be used practically
convenient.
However, operation with "it is convenient and safe is maintained on "practical use, it means
not resulting in the grade which shortens a life remarkably, and the characteristic, a
temperature rise, etc. do not apply correspondingly in the state of rating. Moreover, main
rating shows rated torque (N
･
m).
Fig. 7 Change region of the voltage and frequency
