Rockwell Automation 1395 Discrete Adapter, Rev 3.XX-8.XX - Manual (Page 34)

7 Chapter
7-1
Periodic Maintenance
ATTENTION: Servicing energized industrial control equipment
can be hazardous. Severe injury or death can result from electrical
shock, burn, or unintended actuation of controlled equipment.
Recommended practice is to disconnect and lock out control
equipment from power sources, and allow stored energy in
capacitors to dissipate, if present. If it is necessary to work in the
vicinity of energized equipment, the safety related work practices
of NFPA 70E, Electrical Safety Requirements for Employee
Workplaces, must be followed.
Preventive Maintenance
Periodic Inspection – Industrial control equipment should be inspected
periodically. Inspection intervals should be based on environmental and
operating conditions, and adjusted as indicated by experience. An initial
inspection within 3 to 4 months after installation is suggested. Applicable
parts of the following guidelines should be used:
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 incorrect or ineffective enclosure,
unsealed enclosure openings (conduit or other) or incorrect operating
procedures. Dirty, wet or contaminated parts must be replaced unless they
can be cleaned effectively by vacuuming or wiping.
Terminals – Loose connections can cause overheating that can lead to
equipment malfunction. Check the tightness of all terminals and bus bar
connections and securely tighten any loose connections. Replace any parts
or wiring damaged by overheating.
Solid State Devices – Solid state devices require little more than a periodic
visual inspection. Printed circuit boards should be inspected to determine
whether all ribbon cables are properly seated in their connectors. Board
locking tabs should also be in place. Necessary replacements should be
made only at the PC board or plug-in component level. Solvents should not
be used on printed circuit boards. Where blowers are used, air filters if
supplied should be cleaned or changed periodically depending on the
specific environmental conditions encountered. For additional information
see NEMA Standards Publication No. ICS 1.1-1984 entitled: “Safety
Guidelines for the Application, Installation and Maintenance of Solid State
Control”.