Rockwell Automation 20G2, Техническое обслуживание оборудования

Страница: 27 / 196

Rockwell Automation Publication 750-TG101A-EN-P - June 2022 27
Chapter 2 Preventative and Predictive 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.
PowerFlex 755TS products with XT use dielectric grease to protect critical
connections from the effects of corrosive gases. When you disconnect or
reconnect a greased connection, always inspect for dust, dirt, conductive
debris, or other contaminants. If contamination is found, thoroughly clean
receiving surfaces and reapply dielectric grease as described in the dielectric
grease section. See Dielectric Grease Application on page
17 for details.
Fans - Inspect 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 instructions. Note: Allen-Bradley® magnetic starters, contactors, and
relays are designed to operate without lubrication. Do not lubricate these
Allen-Bradley® devices because oil or grease on the pole faces (mated surfaces)
of the operating magnet can cause the device to stick in the “ON” mode. Some
parts of other devices are factory lubricated – if lubrication during use or
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
lock out or tag out electric circuits and equipment before working on or near
exposed circuit parts.