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U.S. ELECTRICAL MOTORS
INSTALLATION AND MAINTENANCE
Normal
Operation
9
I. When checks are satisfactory to this point, increase the load slowly up to rated load and check unit for
satisfactory operation.
7. Vibration
Motors are supplied as standard in accordance with NEMA MG-1, section 7, which dictates that motor no-load
vibration when mounted on a resilient base shall not exceed the limits as outlined in the following table:
TABLE 1
NO-LOAD VIBRATION LIMITS
Velocity, Inches per second
Speed, RPM Rotational Frequency, Hz peak
3600 60 0.15
1800 30 0.15
1200 20 0.15
900 15 0.12
720 12 0.09
600 10 0.08
If vibration is deemed excessive, check for and correct any misalignment and/or "soft foot" condition per item
3 of this section.
VII. NORMAL OPERATION
Start the motor in accordance with standard instructions for the starting equipment used. Connected load should
be reduced to the minimum, particularly for reduced voltage starting and/or high inertia connected loads, until the
unit has reached full speed.
1. General Maintenance
Routine maintenance is the best assurance of trouble-free motor operation; it prevents costly shutdown and
repairs. Major elements of a controlled maintenance program include:
A. Trained personnel who KNOW the work.
B. Systematic records, which contain at least the following:
1. Complete nameplate data.
2. Prints (wiring diagrams, certified outline dimensions).
3. Alignment data (departures from perfect alignment, allowance for temperature).
4. Winding resistance and temperature.
5. Results of regular inspection, including vibration and bearing temperature data as applicable.
6. Documentation of any repairs.
7. Lubrication data (method of application, type of lubricant used, maintenance cycle by location).