Section 3
Maintenance & Troubleshooting
Maintenance & Troubleshooting 3‐1
MN400
WARNING:
UL Listed motors must only be serviced by UL Approved
Authorized Baldor Service Centers if these motors are to be
returned to a hazardous and/or explosive atmosphere.
General Inspection
Inspect the motor at regular intervals, approximately every 500 hours of operation or
every 3 months, whichever occurs first. Keep the motor clean and the ventilation
openings clear. The following steps should be performed at each inspection:
WARNING:
Do not touch electrical connections before you first ensure that
power has been disconnected. Electrical shock can cause serious
or fatal injury. Only qualified personnel should attempt the
installation, operation and maintenance of this equipment.
1.
Check that the motor is clean. Check that the interior and exterior of the motor
is free of dirt, oil, grease, water, etc. Oily vapor, paper pulp, textile lint, etc. can
accumulate and block motor ventilation. If the motor is not properly ventilated,
overheating can occur and cause early motor failure.
2.
Use a “Megger” periodically to ensure that the integrity of the winding
insulation has been maintained. Record the Megger readings. Immediately
investigate any significant drop in insulation resistance.
3.
Check all electrical connectors to be sure that they are tight.
Relubrication & Bearings
Bearing grease will lose its lubricating ability over time, not suddenly. The lubricating
ability of a grease (over time) depends primarily on the type of grease, the size of the
bearing, the speed at which the bearing operates and the severity of the operating
conditions. Good results can be obtained if the following recommendations are used in
your maintenance program.
Type of Grease
A high grade ball or roller bearing grease should be used. Recommended grease for
standard service conditions is Polyrex EM (Exxon Mobil).
Equivalent and compatible greases include:
Texaco Polystar, Rykon Premium #2, Pennzoil Pen 2 Lube and Chevron SRI.
Relubrication Intervals
Recommended relubrication intervals are shown in Table 3‐1. It is important to realize
that the recommended intervals of Table 3‐1 are based on average use.
Refer to additional information contained in Tables 3‐2, 3‐3 and 3‐4.
Table 3‐1 Relubrication Intervals *
NEMA / (IEC) Frame Size
Rated Speed ‐ RPM
10000
6000
3600
1800
1200
900
Up to 210 incl. (132)
**
2700 Hrs.
5500 Hrs.
12000 Hrs.
18000 Hrs.
22000 Hrs.
Over 210 to 280 incl. (180)
**
3600 Hrs.
9500 Hrs.
15000 Hrs.
18000 Hrs.
Over 280 to 360 incl. (225)
**
* 2200 Hrs.
7400 Hrs.
12000 Hrs.
15000 Hrs.
Over 360 to 5800 incl. (300)
**
*2200 Hrs.
3500 Hrs.
7400 Hrs.
10500 Hrs.
*
Relubrication intervals are for ball bearings.
For vertically mounted motors and roller bearings, divide the relubrication interval by 2.
** For motors operating at speeds greater than 3600 RPM, contact Baldor for relubrication recommendations.
