Table of Contents
Advertisement
U.S. ELECTRICAL MOTORS
INSTALLATION AND MAINTENANCE
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:
Speed, RPM
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).
NO-LOAD VIBRATION LIMITS
Rotational Frequency, Hz
3600
1800
1200
900
720
600
Get other manuals https://www.bkmanuals.com
TABLE 1
Velocity, Inches per second
60
30
20
15
12
10
Normal
Operation
peak
0.15
0.15
0.15
0.12
0.09
0.08
9
Advertisement
Table of Contents
