Maintenance; Introduction And Maintenance Intervals; Recommended Hand Tools; Recommended Maintenance And Lubrication - Siemens WL Series Instruction & Installation Manual
Low voltage metal-enclosed switchgear
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- Operating instructions manual (362 pages) ,
- Selection and application manuallines (83 pages)
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Type WL Low Voltage Metal-Enclosed Switchgear
Maintenance
Introduction and Maintenance Intervals
Periodic inspections and maintenance are essential to obtain
safe and reliable operation of the switchgear. When Type WL
switchgear is operated under "Usual Service Conditions," main-
tenance and lubrication is recommended at five-year intervals.
"Usual" and "Unusual" service conditions for Low Voltage Metal-
enclosed Switchgear are defined in ANSI C37.20.1. Generally,
"usual service conditions" are defined as an environment in
which the equipment is not exposed to excessive dust, acid
fumes, damaging chemicals, salt air, rapid or frequent changes
in temperature, vibration, high humidity, and extremes of
temperature.
The definition of "usual service conditions" is subject to a variety
of interpretations. Because of this, you are best served by
adjusting maintenance and lubrication intervals based on your
experience with the equipment in the actual service environment.
Regardless of the length of the maintenance and lubrication
interval, Siemens recommends that circuit breakers should be
inspected and exercised annually.
Hazardous voltage.
Will cause death or
serious injury.
Keep out.
Qualified personnel only.
Disconnect and lock off all power before
working on this equipment.
For the safety of maintenance personnel as well as others who
might be exposed to hazards associated with maintenance
activities, the safety related work practices of NFPA 70E, parts
II and III should always be followed when working on electrical
equipment. Maintenance personnel should be trained in the
safety practices, procedures and requirements that pertain
to their respective job assignments. This manual should be
reviewed and retained in a location readily accessible for
reference during maintenance of this equipment.
The user must establish a periodic maintenance program to
ensure trouble-free and safe operation. The frequency of
inspection, periodic cleaning and preventative maintenance
schedule will depend upon the operation conditions. NFPA
Publication 70B, "Electrical Equipment Maintenance" may be
used as a guide to establish such a program. A preventative
maintenance program is not intended to cover recondition-
ing or major repair, but should be designed to reveal, if
possible, the need for such actions in time to prevent
malfunctions during operation.
Recommended Hand Tools
The switchgear uses standard SAE fasteners, although some
devices (particularly instruments), may have metric fasteners.
24
Courtesy of NationalSwitchgear.com
DANGER
Recommended Maintenance and Lubrication
Periodic maintenance and lubrication should include all the
tasks shown in Table 1.
WARNING
Failure to properly maintain the equipment can result in death, serious
injury or product failure, and can prevent successful functioning of
connected apparatus.
The instructions contained herein should be carefully reviewed, understood,
and followed.
The maintenance tasks in Table 1 must be performed regularly.
Table 1. Maintenance Tasks
1. Before any maintenance work is performed within primary
compartments, make certain that the equipment is completely
de-energized, tested, grounded, tagged and properly identi-
fied and released for work in an authorized manner.
2. Before starting work on the switchgear, the following should be
completed on any equipment that will affect the area of the work:
A. Disable remote control and automatic transfer schemes.
B. De-energize all direct and backfeed power and control
sources, test and ground.
C. Disconnect all voltage and control power transformers.
D. Open all disconnects.
3. Include the following items in your inspection procedure:
A. Check general condition of switchgear installation
B. Inspect switchgear interior for accumulation of dust, dirt or
any foreign matter, and clean as needed.
C. Clean air filters by washing in any mild household detergent.
D. Examine indicating lamps and replace as required.
E. Check terminal block contacts for loose connections.
F. Check instrument and control switches and inspect their
contacts.
G. Check for proper condition of instrument transformers.
Replace burned out fuses, if any. Check primary and secondary
connections.
H. Remove dust from all insulators and insulation.
I. Inspect bus bars and connections for proper condition. If bus
bars are overheating, check for poor or loose connections
or for overload.
J. Check wiring for loose connections.
K. Examine automatic shutters (if any) for proper operation.
L. Check MOC and TOC switches (if provided) and their operating
mechanisms for proper operation, and check their contacts.
M. Examine all safety interlocks for correct function.
N. Perform maintenance of circuit breakers outlined in circuit
breaker instruction manual.
O. Check space heaters and thermostat (if equipped) for proper
operation.
P. Maintain other equipment per the relevant instruction
manual requirements.
Q. Lubricate mechanisms, contacts, and other moving
components.
R. Replace, reassemble, re-insulate, return all items to proper
operating conditions and remove grounds prior to energization.
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