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Rockwell Automation Publication 7712-UM001D-EN-P - October 2017
Chapter 5
Maintenance
Contamination
If inspection reveals that dust, dirt, moisture or other contamination has
reached the control equipment, the cause must be eliminated. This could
indicate an incorrectly selected or ineffective enclosure, unsealed enclosure
openings (conduit or other) or incorrect operating procedures. Replace any
improperly selected enclosure with one that is suitable for the environmental
conditions - refer to NEMA Standard No. 250, Enclosures for Electrical
Equipment for enclosure type descriptions and test criteria. Replace any
damaged or cracked elastomer seals and repair or replace any other damaged or
malfunctioning parts (e.g., hinges, fasteners, etc.). Dirty, wet or contaminated
control devices must be replaced unless they can be cleaned effectively by
vacuuming or wiping. Compressed air is not recommended for cleaning
because it may displace dirt, dust, or debris into other parts or equipment, or
damage delicate parts.
Operating Mechanisms
Check for proper functioning and freedom from sticking or binding. Replace
any broken, deformed or badly wont parts or assemblies according to
individual product renewal parts lists. Check for and retighten securely any
loose fasteners. Lubricate if specified in individual product instructions. Note:
Allen-Bradley magnetic starters, contactors and relays are designed to operate
without lubrication-do not lubricate these devices because oil or grease on the
pole faces (mating surfaces) of the operating magnet may cause the device to
stick in the “ON” mode. Some parts of other devices are factory lubricated-if
lubrication during use or maintenance of these devices is needed, it will be
specified in their individual instructions. if in doubt, consult your nearest
Allen-Bradley Sales Office for information.
Terminals
Loose connections in power circuits can cause overheating that can lead to
equipment malfunction or failure. Loose connections in control circuits can
cause control malfunctions. Loose bonding or grounding connections can
Increase hazards of electrical shock and contribute to electromagnetic
interference (EMI). Check the tightness of all terminals and bus bar
connections and tighten securely any loose connections. Replace any parts or
wiring damaged by overheating, and any broken wires or bonding straps.
Содержание Allen-Bradley 7712
Страница 6: ...6 Rockwell Automation Publication 7712 UM001D EN P October 2017 Table of Contents Notes ...
Страница 10: ...10 Rockwell Automation Publication 7712 UM001D EN P October 2017 Preface Notes ...
Страница 14: ...14 Rockwell Automation Publication 7712 UM001D EN P October 2017 Chapter 1 General Information Notes ...
Страница 24: ...24 Rockwell Automation Publication 7712 UM001D EN P October 2017 Chapter 3 Start up Procedure ...
Страница 25: ...Rockwell Automation Publication 7712 UM001D EN P October 2017 25 Start up Procedure Chapter 3 ...
Страница 26: ...26 Rockwell Automation Publication 7712 UM001D EN P October 2017 Chapter 3 Start up Procedure ...
Страница 36: ...36 Rockwell Automation Publication 7712 UM001D EN P October 2017 Chapter 4 Equipment Operation Notes ...
Страница 58: ...58 Rockwell Automation Publication 7712 UM001D EN P October 2017 Chapter 5 Maintenance Notes ...
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