User manual

AC Adjustable Frequency Drives
Important Safety and Product Information
160
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The parties acknowledge that they have required that the
agreement evidenced hereby be drawn up in English. Les parties
reconnaissent avoir exigé la rédaction en anglais du Contrat. In the
event of a conflict between the English and other language
versions, the English version will prevail.
Preventive Maintenance and Repair
Maintenance of Solid-State Control
5.1 General
A well-planned and executed maintenance program is essential to
the satisfactory operation of solid-state electrical equipment. The
kind and frequency of the maintenance operation will vary with
the kind and complexity of the equipment as well as with the
nature of the operating conditions. Maintenance recommendations
of the manufacturer or appropriate product standards should be
followed.
Useful reference publications for setting up a maintenance
program are NFPA 70B-1983, Maintenance of Electrical
Equipment, and NFPA 70E-1983, Electrical Safety Requirements
for Employee Workplaces.
5.2 Preventive Maintenance
The following factors should be considered when formulating a
maintenance program:
1. Maintenance must be performed by qualified personnel familiar
with the construction, operation, and hazards involved with the
control.
2. Maintenance should be performed with the control out of
operation and disconnected from all sources of power. If
maintenance must be performed while the control is energized, the
safety related practices of NFPA 70E should be followed.
3. Care should be taken when servicing electrostatic sensitive
components. The manufacturer's recommendations for these
components should be followed.
4. Ventilation passages should be kept open. If the equipment
depends upon auxiliary cooling, e.g., air, water, or oil, periodic
inspection (with filter replacement when necessary) should be
made of these systems.
5. The means employed for grounding or insulating the equipment
from ground should be checked to assure its integrity (see 4.5).
6. Accumulations of dust and dirt on all parts, including on
semiconductor heat sinks, should be removed according to the
manufacturer's instructions, if provided; otherwise, the
manufacturer should be consulted. Care must be taken to avoid
damaging any delicate components and to avoid displacing dust,
dirt, or debris in a way that permits it to enter or settle into parts
of the control equipment.
7. Enclosures should be inspected for evidence of deterioration.
Accumulated dust and dirt should be removed from the top of the
enclosures before opening doors or removing covers.
8. Certain hazardous materials removed as part of maintenance or
repair procedure (e.g., polychlorinated biphenyls (PCB) found in
some liquid filled capacitors) must be disposed of as described in
Federal regulations.
Preventive Maintenance [Explanatory
Information (Supplementary Comments -
Not part of NEMA Standards Publication
No. ICS 1.1)]
Lithium batteries are frequently used for memory backup in solid
state equipment due to their excellent shelf life and high energy-
to-weight ratio. Lithium is a highly reactive metal that can cause
burns if there is contact with skin. The batteries are sealed so there
is seldom a problem of contact with lithium as long as reasonable
care is exercised when handling them. They should only be used
in their intended application and not subjected to rough handling.
When batteries are replaced in equipment, the batteries removed
should be disposed of in accordance with the battery supplier's
instructions.
The Department of Transportation has certain regulations that
prohibit shipment of equipment with batteries installed if the
batteries contain 0.5 grams or greater of lithium. The batteries
must be removed from equipment and shipped separately in a
container approved by the Department of Transportation.
Additional Department of Transportation restrictions apply to the
shipment of lithium batteries.
NEMA Standards Publication No. ICS 1.3-1986, Preventive
Maintenance of Industrial Control and System Equipment, is
recommended for personnel responsible for maintenance of
equipment.
This section is excerpted from Rockwell Automation publication
SGI-1.1, Safety Guidelines for the Application, Installation, and
Maintenance of Solid-State Control and parts of Section 5 of
NEMA Standards Publication No. ICS 1.1-1987, titled Safety
Guidelines for the Application, Installation, and Maintenance of
Solid-State Control. The text from the NEMA Standard has been
reprinted verbatim with NEMA's permission. Text set off from the
NEMA standard content under the heading Information contains
Rockwell Automation comments for the NEMA content
immediately preceding it. The comments provide information to
help readers better understand the characteristics of industrial
equipment employing solid-state technology. NEMA text is
provided solely as a convenience to the reader, and Rockwell
Automation assumes no responsibility for its completeness or
validity.
NEMA Standards Publication No. ICS 1.1-1984, Rev. No. 1 -
October 1987, is available from the National Electrical
Manufacturers Association, 2101 L Street, N.W., Washington, DC
20037. Allen-Bradley Publication SGI-1.1 is available from
www.rockwellautomation.com/literature.