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Maintenance
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 1 1 and 1 1 1 , 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 Instruction 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 preventive maintenance schedule will depend upon the
operating conditions. NFPA Publication 708, 'Electrical Equipment
Maintenance' may be used as a guide to establish such a program. A
preventive
maintenance
program
reconditioning or major repair, but should be designed to reveal, if
possible, the need for such actions in time to prevent malfunctions
during operation.
Service Conditions and Maintenance Intervals
'Usual' and 'Unusual' service conditions for Low Voltage Metal-Enclosed
Switchgear are defined in ANSI C37.20. 1 , clauses 3 and 7 . 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, or extremes of temperature.
This definition 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 actual service environment.
e frequency of required maintenance depends on the nature of the
service conditions; the more severe the conditions, the more frequently
that maintenance is needed. Table 3 gives service and lubrication
intervals for type RL (LM version circuit breakers applied under ANSI
'Usual Service Conditions'. This table indicates that RL circuit breakers
(with 'LM' in the type designation on the rating label) have a five (5) year
maintenance interval.
Regardless of the length of the maintenance (lubrication) interval,
the tripping system should be checked and exercised periodically.
The circuit breaker should be inspected and exercised periodically.
Always inspect a circuit breaker that has interrupted a heavy fault
current.
is
not
intended
to
cover
- -:0:-
Hazardous voltages and high-speed moving
parts.
Will cause death, serious personal injury, and
property damage.
Always de-energize and ground the
before
Read instruction manuals, observe safety instruc
t
i
o
ns
,
and
<---- - -
AWARNING
�-
properly maintain the equipment can result in death,
Failure t o
serious
injury or product failure, and can prevent successful func
tioning
of connected apparatus.
The m
i
st
uc
s
r
t
o
n
contained herein should be carefully reviewed,
stood.
and followed
The f
ll
o
o
w
in
g
maintenance procedures must be perlormed re
Recommended annual RL circu1t breaker i n spection procedure
F\ecommended RL breaker maintenance and lubrication
The above
list does not represent an exhaustive survey of maintenance
steps necessary to ensure safe operation of the equipment. Particular
applications may require further procedures. Should further information
be desired or should particular problems arise which are not covered
sufficiently for the user's purposes, the matter should be referred to the
Siemens
local
sales office.
The
use of
unauthorized parts in the repair of the equipment, or
tampering by unqualified personnel will result in dangerous conditions
whi c h can
cause death, serious injury or equipment damage. Follow
instructions
safety
contained herein.
u
a
L
b
i c
t i o n
r
Lubrication should be a part of the serv1cmg procedure. Old grease
should be removed from bearing pins and other non-current carrying
rotating or sliding surfaces. A thin film of lubricant should be applied in
accordance with the 'Lubrication Chart', Table 5, Page 16.
Apply lubricants with care to avoid getting grease on insu la
since it may affect the dielectric strength. Faces of arcing
faces of main contacts should not be lubricated . The rubbing surfaces
(i.e., those surfaces without brazed on contact tips) of the main contact
fingers, arcing contact fingers, and hinge contact fingers should be
lubricated with a coating of Siemens lubricant, part no. 1 5-1 72-7 9 1 -2 1 4.
Or 1 5-171 -370-002 . user to determine choice based on existing lubricant
in the Cubicle or Adapter. If dust or dirt has accumulated, disassembly
may be necessary to clean and re-lubricate these points. See 'Contact
Replacement', Page
17 and 'Lubrication Chart', Table 5, Page 16.
11
A DANGER -
equipment
maintenance.
limit use
personnel.
to qualified
-;
__
-
p
roc
t
i n g members,
-
-
-
- -
under
gul
a
rl
y:
e
dur
e
.
contacts and
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