WorldWide Electric Corporation Induction Motor NATJ12-36-56CB

Measure and record the resistance of the winding insulation every 30 days of storage.

Check the insulation resistance of the stator windings with a megohmmeter if the motor has been in storage for a long period or exposed to adverse conditions.

Determine if it is necessary to change out bearings based on storage length and conditions.

Is the resistance lower than 1 megohm?

If resistance is lower than 1 megohm, dry the windings using one of the following methods:

Constantly monitor the conditions during the drying process.

Ensure ventilation openings are clear and unobstructed

Check the condition of shaft seals and replace if necessary

Check the condition of connections and mounting and assembly bolts

Listen for any unusual noise from the bearings

Inspect spent grease for abnormalities

Ensure the underside of the motor feet and/or flange is clean and free of dirt.

Remove any masking materials or rust inhibitive coating from the mounting surface and shaft.

Verify ball bearing motor mounting positions as per NEMA MG1-4.03

Is the motor used with an elastic coupling system?

Is the motor securely installed to a rigid foundation or mounting surface?

Remove drain plugs from the end shield or frame on totally enclosed motors.

Are the drain plugs mounted at the lowest point of the frame?

Disconnect the load when starting the motor, ensuring the key is removed from the shaft.

Check direction of rotation. Is the rotation correct?

If rotation must be changed, describe the steps taken to interchange power leads.

Is the motor starting quickly and running smoothly when coupled to the load?

If the motor does not start quickly and run smoothly, describe the identified cause.

Enter the motor current after a few minutes of operation.

Is the motor current within the acceptable range based on the nameplate rating and service factor?

For AC motors with frequency inverters, is the maximum speed rating not exceeded?