Time TV-300 - Appendix 1: Vibration Standard; Rank of Machine Vibration (ISO2372); Max Vibration for Motors > 1 HP (NEMA MG1-12.05); Max Vibration for High-Power Induction Motors (NEMA MG1-20.52)

A
. R
ANK OF MACHINE VIBRATION
(ISO2372)
Note:
(1) Class I is small motor (power less than 15kW). Class I is medium motor (power
between 15kW~75kW). Class ? is high power motor (hard base); Class ? is high power motor (stretch base).
(2) A, B, C, D are vibration rank. "A" means good, "B" means satisfying, "C" means not satisfying, "D" means
forbidden. Vibration velocity should be taken from the three perpendicular axes on the motor shell.
B. M
AXIMUM VIBRATION OF MOTOR THAT POWER LARGER THAN 1 HORSEPOWER
(NEMA MG1-12.05)
* For AC motor, rev is maximum synchronous rev. For DC motor, it is maximum power
rev. For motor in series, it is work rev.
C. MAXIMUM VIBRATION OF HIGH-POWER INDUCTION DRIVE MOTOR
(NEMA MG1-20.52)
* National Electric Manufacturers Association (NEMA) establishes two standards
above.
18 Manual TV-300
APPENDIX 1: VIBRATION STANDARD