Section 5 Preventive Maintenance And Repair Guidelines - Parker H Series Installation & Service Instructions Manual

Safety Guidelines for the Application, Installation and Maintenance of Solid State Control
Section 5
Preventive Maintenance and
Repair Guidelines
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.
recommendations for these components should be
followed.
4. Ventilation passages should be kept open.
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.
(continued)
The manufacturer's
If the
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C.5.2 Preventive Maintenance
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
supplier's instructions.
The Department of Transportation has certain regulations
that prohibit shipment of equipment with batteries installed
if the batteries contain 0.5 gram 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.
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