Section 3
Maintenance & Troubleshooting
Maintenance & Troubleshooting 3
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1
MN427
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.
WARNING:
Pacemaker danger
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Magnetic and electromagnetic fields in the vicinity of current carrying
carrying conductors and permanent magnet motors can result result in a serious health hazard to
persons with cardiac pacemakers, metal implants, and hearing aids. To avoid risk, stay way from
the area surrounding a permanent magnet motor.
WARNING:
RPM AC permanent magnet motors can induce voltage and current in the motor leads by rotating
the motor shaft. Electrical shock can cause serious or fatal injury. Therefore, do not couple the
load to the motor shaft until all motor connections have been made. During any maintenance
inspections, be sure the motor shaft will not rotate.
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.
WARNING:
The Adjustable Speed Controller may apply hazardous voltages to the motor leads after power to
the controller has been turned off. Verify that the controller is incapable of delivering hazardous
voltages and that the voltage at the motor leads is zero before proceeding. Failure to observe this
precaution may result in severe bodily injury or death.
WARNING:
Surface temperatures of motor enclosures may reach temperatures which can cause discomfort
or injury to personnel accidentally coming into contact with hot surfaces. When installing,
protection should be provided by the user to protect against accidental contact with hot
surfaces. Failure to observe this precaution could result in bodily injury.
WARNING:
Guards must be installed for rotating parts such as couplings, pulleys, external fans, and unused
shaft extensions, should be permanently guarded to prevent accidental contact by personnel.
Accidental contact with body parts or clothing can cause serious or fatal injury.
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:
1. Check that the motor is clean. Check that the exterior fins of the motor are free of dirt, oil, grease, etc.
If the motor is not properly ventilated, overheating can occur and cause early motor failure.
2. Perform a dielectric with stand test periodically to ensure that the integrity of the winding insulation
has been maintained. Record the readings. Immediately investigate any significant decrease 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.
Relubrication with the shaft stationary and a warm motor is recommended.
Lubrication Procedure
WARNING:
Disconnect all electrical power from the motor windings and accessory devices before
disassembly of the motor. Electrical shock can cause serious or fatal injury.
1. Relubrication with the shaft stationary and a warm motor is recommended.
2. Wipe all dirt from the outside of the grease fills and drains.
3. Locate the grease inlet at the top of the bearing hub, clean the area and replace the 1/8
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inch pipe
plug with a grease fitting if the motor is not equipped with grease fitting.
4. Remove grease drain plug located opposite the grease inlet.
5. Using a manual grease gun, pump in the recommended grease in the amount shown in Table 3-1.
This amount of grease will provide an ample supply of lubricant between lubrication intervals. Use
only clean, fresh grease from clean containers and handle so as to keep it clean. In general, mixing
of greases is not recommended.
If an incompatible grease is used, the lube system must be repacked completely with the new
grease.
6. Wipe away any excess grease at the grease drain or relief and replace drain plugs.
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