Standard Motor Catalog

Section TR Technical Reference Guide

Table 22: Comparison of Mounting Configurations between IEC and NEMA

Benefits of Lower Vibration Machinery vibration is a significant contributor to equipment failure. To build reliable equipment it is advisable to use motors with lower vibration. GE’s XSD Ultra ® Vibration at rated voltage and frequency shall not exceed the limits of 0.04 inch per second. Overall vibration as evaluated by NEMA MG-1, Part 7. Following can be the advantages of using motors with lower vibration including: • Longer bearing life • Reduced damage to the shafts and rotor • Fewer equipment break-down • Lower operational noise • Minimum power loss hence efficient operation of equipment • Low energy costs • Minimum stress levels in the equipment structures For additional information, refer IEEE Paper PCIC-2003-12 BEARING SYSTEMS Antifriction All standard motors are equipped with “clean steel” Conrad deep groove type ball bearings, sized for the loads to be expected in industrial applications. Sleeve-Type Split-sleeve bearings are available for frames 509 through 5013 in Dripproof, Weather Protected I and II, and some Totally enclosed fan cooled (Quantum design) enclosures. They should be used for direct drive applications only. For DP, WPI, and WPII enclosures, the bearings are mounted in the bottom and top halves of the split endshields. The top half endshield is removable for bearing or winding inspection. TEFC Quantum can be supplied with split sleeve bearings mounted outboard of the motor endshields. Solid sleeve bearings are available for frames 509 through 5013 totally-enclosed-fan-cooled machines (Non-Quantum). Sleeve bearings are not available on explosion-proof motors. All sleeve bearings are equipped with oil reservoirs, ring oilers, sight gauges, level gauges and drain provisions. BEARING LUBRICATION Ball bearing motors are shipped with sufficient grease for a long operating period. Re-lubrication at intervals consistent with the type of service shown in Table 24 will provide longer bearing life. Excessive, too frequent lubrication or the use of non compatible lubrication may damage the motor. If the bearing grease cavity and the bearing races have excessive grease to the point where the grease stays packed around the bearing rotating elements, the bearing will actually run hotter. Follow re-lubrication type and procedures provided in the instructions shipped with motors.

Arrangement Floor Mounting Ceiling Mounting Wall Mounting, Shaft Horizontal Wall Mounting, Shaft Vertical

NEMA Mounting IEC Mounting*

F1, F2 C1, C2 W2, W4 W1, W3

IM B3/IM 1001 IM BB/IM 1071 IM B6/IM 1051 IM B7/IM 1061 IM V5/IM 1011 IM V6/IM 1031

W6, W7, W9, W10, W11, W12

W5, W8

*Terminal box location as per IEC 60034-7

Table 23: Vibration Limits (140-5013 Frame) Motors with two ball bearings Vibration measured in Inches/Sec RPM Standard Special DYNAMIC BALANCE General Electric motors are dynamically balanced so that vibration, as tested per NEMA standard MG-1, Part 7, will be within the limits stated below for standard balance. Motors balanced to either the special or precision balance limits shown will be furnished at additional price when specified. Precision balance is a feature of the XSD Ultra ® severe-duty product line. Motors with one ball bearing and one roller bearing Vibration measure in Inches (peak to peak) RPM Standard Special Precision 3000-4000 0.001 0.0005 0.0003 1500-2999 0.0015 0.0008 0.0004 1000-1499 0.002 0.001 0.0005 999 and slower 0.0025 0.0013 0.0007 Precision XSD Ultra All Speeds 0.15 0.075 0.055 0.04

Figure 28: Shows the position of Cast-in Vibration Pads, on Standard XSD Ultra ® Motors


Data subject to change without notice. 02/23 •

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