Siemens SIMOTICS GP Operating Instructions Manual page 76

CAUTION:
Danger caused by inappropriate fasteners material
If screws of an incorrect property class have been selected or if
have been fastened to an incorrect tightening, they may break or become
loose. This will cause the motor to move, which could damage the bearing.
The motor could smash into de motor enclosure and motor parts could be
flung out of place. This can result in death, serious injury or material damage
• Comply with the required property classes for screws connections.
• Tighten the screwed connections to de specified tightening torques.
Specific conditions of use:
- Special screws are used and for replacements only identical ones
will be used. See this installation manual for additional information.
- The free and diametric spaces are smaller than the values
specified in table 1 of the IEC 60079-1 standard and are not intended for
repair. For information on the dimensions of explosion-proof joints, contact
the original manufacturer.
- The other special conditions are stipulated in the instructions.
Special screws:
The screws that are used according to the sizes of the frame and
connection boxes are the following:
End shields Screws
Frame Size
143/145
182/184:
213/215
254/256
284/286
324/326
364/365
404/405
444/445
447 y 449
Unrestricted
Screws
1 / 4" - 20NC
5 / 16" - 18NC
3 / 8" - 16NC
1 / 2" – 13NC
5 / 8" – 11NC
76
(XP IECEx motors)
Grade
(mínimum)
5
5
5
5
5
.
Tensile Strength
(mínimum)
(PSI)
120,000
120,000
120,000
120,000
120,000
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