24 Rockwell Automation Publication 750-TG100B-EN-P - June 2019
Chapter 1 Before You Begin Tests, Maintenance, or Repairs
Fastener Torque Sequences
The following illustrates initial and final tightening sequences for components
that are fastened to a heat sink by using two, four, and six screws. Initial torque is
1/3 (33%) of final torque, except six-point mountings, which require 0.7 N
•m
(6 lb
•in) initial torque. The numeric illustration labels are for your assistance.
Drive components do not contain these labels.
Figure 2 - Two-point Mounting
Figure 3 - Four-point Mounting
ATTENTION: When mounting components to a drive 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.
1
2
Initial Sequence
1
2
12
Final Sequence
1
2
3
4
3 4
Initial Sequence
1
2
1
234
Final Sequence
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