COMMON AR 1765250 - Caterpillar

Starting
The first-start should last only about one (1) second, during which the direction of rotation of the motor is verified. The direction of rotation of possible external blower motors must also be verified. Verify also that the rotating parts do not touch any stationary parts.Note: If the motor does not have an axial locating bearing, and the motor is started uncoupled, is normal that the shaft will move axially before stabilizing. Standard Cat CN motors will have an axial locating bearing at the drive end.Direction of Rotation
The objective of the first starting is to check the direction of rotation of the motor.The motor should turn in the same direction as is shown with an arrow located on the frame or the fan cover.The direction of rotation of the external blower motor is indicated by an arrow near the blower motor.The motor may only be operated in the specified direction of rotation. The direction of rotation is indicated on the marking plate. Refer to Operation & Maintenance Manual, SEBU8852, "Plate Locations and Film Locations".Motors suitable for reversing operation are labeled with a double-headed arrow on the rating plate, and on the frame.If the desired direction of rotation is different from the one specified on the motor, the cooling fans, in inner and/or outer cooling circuit, must be changed, and the stamp on the rating plate.To alter the direction of rotation, interchange the power supply phases.First-Time Running of the Motor
After a successful first-start test, the coupling between the driving motor and the driven machine should be coupled, and the motor can be restarted.Supervision During the First-Time Running of the Motor
During running first coupled run of the motor and driven equipment, verify that the whole system functions as expected. Frequently monitor vibration levels, temperature of the windings and bearings and other equipment. If the whole system functions as expected, the motor can be left running for a longer time.Check the operating load of the motor by comparing the load current with the value given on the rating plate of the motor.Record the temperature readings given by the temperature detectors placed in the windings and possibly in the bearings. Check the temperatures frequently to ensure that the temperatures remain below the limits. Continuous temperature monitoring is highly recommended.Note: If no RTDs are available for monitoring, the surface temperature of the bearing area must be measured. The bearing temperature is approximately 10° C (50° F) higher than a surface temperature.If there are any deviations from expected normal operation, such as elevated temperatures, noise, or vibration, shut down the motor. Find and correct the reason or cause for the deviations before starting the motor again. If necessary, consult the manufacturer, or consult with Caterpillar Dealer Customer Service personnel.Note: Never disengage any protective or safety devices.Checks During Running of the Motor
Close surveillance of the motor should be performed over the first several days of running the motor. Monitor for abnormal changes in vibration, temperature, sound, or current draw.Bearings
The rotating electrical motors manufactured by Caterpillar are