42 Rockwell Automation Publication 750-TG100B-EN-P - June 2019
Chapter 2 Preventative Maintenance
Maintenance of Industrial
Control Equipment
Periodic Inspection - Periodically inspect industrial control equipment. Base
inspection intervals on the environmental and operating conditions and adjust
the intervals as necessary. An initial inspection within 3 to 4 months after
installation is suggested. See National Electrical Manufacturers Association
NEMA) Standard No. ICS 1.3, Preventive Maintenance of Industrial Control
and Systems Equipment, for general guidelines for defining a periodic
maintenance program. Some specific guidelines for Rockwell Automation
products are listed here.
Contamination - If inspection reveals that dust, dirt, moisture, or other
contamination has reached the control equipment, the cause must be removed.
Contamination can 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. See the Industry Installation Guidelines for
Pulse Width Modulated (PWM) AC Drives, publication DRIVES-AT003
, for
guidance on environmental considerations. See NEMA Standard No. 250,
Enclosures for Electrical Equipment, or UL 50E Electrical Equipment
Enclosures, for enclosure type descriptions and test criteria. Replace any damaged
or cracked elastomer seals and repair or replace any other damaged or
malfunctioning parts (for example, hinges and fasteners). Dirty, wet, or
contaminated control devices must be replaced. Compressed air is not
recommended for cleaning because it can displace dirt, dust, or debris into other
parts or equipment, or damage delicate parts.
Blowers and Fans - Inspect blowers and fans that are used for forced air cooling.
Replace any that have bent, chipped, or missing blades, or if the shaft does not
turn freely. Apply power momentarily to check operation. If the unit does not
operate, check and replace wiring, fuse, or blower or fan motor as appropriate.
Clean or change air filters as recommended in the product manual. Also, clean
the fins of heat exchangers so convection cooling is not impaired.
Operating Mechanisms - Check for proper function and freedom from sticking
or binding. Replace any broken, deformed, or badly worn parts or assemblies
according to individual product renewal-parts lists. Check for and re-tighten
securely any loose fasteners. Lubricate if specified in individual product
ATTENTION: Performing service on energized Industrial Control Equipment can
be hazardous. Severe injury or death can result from electrical shock, bump, or
unintended actuation of controlled equipment. Recommended practice is to
disconnect and lockout control equipment from power sources, and release
stored energy, if present. See National Fire Protection Association Standard No.
NFPA 70E, Part II and (as applicable) OSHA rules for Control of Hazardous Energy
Sources (lockout/tagout) and OSHA Electrical Safety Related Work Practices for
safety-related work practices. These publications include procedural
requirements for lockout/tagout, and appropriate work practices, personnel
qualifications, and required training where it is not feasible to de-energize and
lockout or tagout electric circuits and equipment before working on or near
exposed circuit parts.
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