Appendix - UNI-T UT313 Operating Manual

Appendix:

a. Mechanical Vibration Rating Table
Applicable to the following machine
Vibration intensity
Vibration velocity Vrms(mm/s)
45
27
ISO2372
Notes:
1) Grade I is small-size electric motor (less than 15kW electric motor); Grade
II is medium-size electric motor (15kW-75kW electric motor); Grade III is
large original electric motor (hard base) ; grade IV is large original electric
motor (plastic base).
2) A, B, C, D is the vibration rating. A is great, B is satisfactory, C is discontent
and D is not allowed. The measurement velocity RMS value shall be on the
orthogonal intersection direction of shell bearing.
b. the maximum allowable vibration for electric motor higher than 1
horsepower NEMA MG1-12.05
Rotating speed
Peak-peak displacement amplitude
3000~4000
1500~2999
1000~1499
999
25.4
38.1
50.8
63.6
28