Fastener torque specifications, Torque sequence – Rockwell Automation PF700 PowerFlex 700 Drive Components Replacement - Frame 9 User Manual
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Rockwell Automation Publication 20B-IN025B-EN-P - January 2011
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Component Diagrams and Torque Specs Chapter 1
Fastener Torque
Specifications
Torque Sequence
Figure 6 illustrates initial and final tightening sequences for components fastened
to a heat sink using two, four, and six screws. Initial torque is one-third (33.3%) of
final torque, except six-point mountings, which require 0.7 N•m (6 lb•in.) The
numeric illustration labels are for your assistance. Drive components do not carry
these labels.
Figure 6 - Various-Point Mounting
ATTENTION: When mounting components to a drive’s heat sink,
component fastener torque sequences and tolerances are crucial
to component-to-heat sink heat dissipation.
Components can be damaged if initial tightening procedure is not
performed to specification.
Initial
Torque Sequence
Final
Torque Sequence
Two-Point Mounting
Start
End
End
Start
1
2
1
2
Initial
Torque Sequence
Final
Torque Sequence
Four-Point Mounting
End
Start
Start
End
1
2
4
3
3
4
2
1
Note: Do not exceed 0.7 N•m (6 lb•in) on initial torque.
Initial Torque Sequence
Six-Point Mounting
Start
End
Final Torque Sequence
Start
End
6
2
3
1
4
5
6
2
3
1
4
5