Siemens 3AH3 Instruction Manual page 29

Failure to maintain the equipment can result in death, serious injury, property damage 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.
Note: A preventive maintenance program is
not intended to cover reconditioning 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
Metric hardware is used on these circuit
breakers.
The following list of hand tools describes
those normally used in disassembly and
re-assembly procedures:
Open-end wrenches: 7, 8, 10, 13, 17, 19
and 24 mm
Open-end wrench: 55 mm used to
exchange shock absorber (Quantity: two
pieces are required for the task)
Sockets: 7, 8, 10, 13 and 17 mm
Socket: 36 mm (used for replacing post
insulators)
Deep sockets: 19 and 24 mm
Hex keys: 5, 6, 8 and 10 mm
Torque wrench: 0-150 Nm
(0-100 ft-lbs)
Screwdrivers: 0.032 x 1/4 in wide and
0.055 x 7/16 in wide
Pliers
Light hammer
Dental mirror
Flashlight
Drift pins: 1/8, 3/16 and 1/4 in
Retaining ring plier (external type, tip
diameter 0.038 in).
Recommended maintenance and
lubrication
Periodic maintenance and lubrication should
include all the tasks shown in Table 1.
Recommended procedures for each of the
listed tasks are provided in this section of
the instruction manual.
The list of tasks in Table 1 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 that are not
covered sufficiently for the User's purposes,
the matter should be referred to the local
Siemens sales office.
Checks of the primary power path
The primary power path consists of the
three vacuum interrupters, the three upper
and the three lower primary disconnects
(drawout only) or bus connections
(stationary only). These components are
checked for cleanliness and condition. The
vacuum interrupters are also checked for
vacuum integrity.
Some test engineers prefer to perform the
contact-erosion check during the manual
spring-charging check of the operator, since
charging of the springs is necessary to place
the contacts in the CLOSED position.
Also, the vacuum-integrity check is usually
performed in conjunction with the high-
potential tests.
These instructions assume these tests
(contact-erosion/manual spring-charging
check and vacuum-integrity/high-potential
tests) will be combined as described.
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