Emerson LARGE AC ELECTRIC MOTORS User Manual

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:

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.

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).