Rockwell Automation 1336-SN-SP19A Snubber Board Kit, 1336-SN-SP19A - Manual (Page 4)

1336-5.49 – August, 1999
I-4
Electrostatic Discharge
Precautions
Electrostatic discharge generated by static electricity can damage the
complimentary metallic oxide semiconductor devices on various
drive boards. It is recommended that you perform these procedures to
guard against this type of damage when circuit boards are removed or
installed:
• Wear a wrist-type grounding strap that is grounded to the drive
chassis.
• Attach the wrist strap before removing the new circuit board from
the conductive packet.
• Remove boards from the drive and immediately insert them into
their conductive packets.
Torque Sequence
When mounting components to a drive’s heat sink,
component-fastener torque sequences and tolerances are crucial to
component-to-heat sink heat dissipation.
The following illustrates temporary and final tightening sequences for
components fastened to a heat sink using two, four, and six screws.
Temporary torque is 1/4 (25%) of final torque. The numeric
illustration labels are for your assistance. Drive components do not
carry these labels.
!
ATTENTION: This assembly contains parts and sub-
assemblies that are sensitive to electrostatic discharge.
Static control precautions are required when servicing
this assembly. Component damage may result if you
ignore electrostatic discharge control procedures. If you
are not familiar with static control procedures, reference
Allen-Bradley Publication 8000-4.5.2, Guarding
Against Electrostatic Damage, or any other applicable
ESD protection handbook.
!
ATTENTION: Component can be damaged if
temporary tightening procedure is not performed to
specification.