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Rockwell Automation Publication 440G-UM001C-EN-P - June 2019
Chapter 6
Diagnostics and Troubleshooting
Diagnosis of Physical Switch
Anomalies
Mounting Holes of the Switch Body Cracked or Broken
The mounting holes of the switch body can crack when washers are used to
mount the switch or when an incompatible thread locking compound is used
to secure the mounting hardware. Three M5 fasteners are needed to properly
mount the switch body. Washers are not required and when used can cause the
holes to crack or break. Do not over torque the screws.
Check the manufacturer specifications of any thread-locking compound used
to secure the screws. It is recommended to use a cyanoacrylate-type compound.
Other compounds can cause stress cracks in the plastic feet of the switch.
Locking Bolt Discolored and/or Corroded
Discoloration of the end of the locking bolt might be a sign of corrosion caused
by incompatibility with a liquid used in the application.
Bulletin 440G-LZ is resistant to most alkaline clean-in-place (CIP) cleaners.
It is recommended that the switch be thoroughly rinsed with water after
exposure to CIP. This step prevents adverse effects that may occur with long-
term exposure.
It is also recommended that the switch be mounted in the inverted position
with the actuator at the bottom. This position allows liquids to drain away
from the locking bolt.
IMPORTANT
Loctite 242 thread-locking adhesive is known to cause stress cracks in the
440G-LZ plastic housing and should not be used. Lab tests have determined
that Loctite 425, a cyanoacrylate adhesive, does not cause cracking and can
be considered if the faster cure time is acceptable in the application.
IMPORTANT
Synergex is a cleaner that has been identified as marginally compatible.
Содержание Allen-Bradley Guardmaster 440G-LZS21SP Series
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Страница 36: ...36 Rockwell Automation Publication440G UM001C EN P June 2019 Chapter 6 Diagnostics andTroubleshooting Notes ...
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