Siemens 3AH3 Instruction Manual page 30

30
The use of unauthorized parts in the repair of the equipment, or tampering by unqualified personnel
can result in hazardous conditions, that can result in death, serious injury or property damage.
Follow all safety instructions contained herein.
Inspection items and tests
Primary-power path checks
Cleanliness check
Inspection of flexible connectors
Stored-energy operator-mechanism checks
Maintenance and lubrication
Fastener check
Manual spring-charging check
Contact-erosion check
Electrical-control checks
Wiring and terminals checks
Secondary-disconnect check (drawout only)
Automatic spring-charging check
Electrical close and trip check
Vacuum-integrity check
High-potential test
Insulation test
Contact-resistance test
Inspection and cleaning of circuit-breaker
insulation
Functional tests
Table 1: Maintenance tasks
Cleanliness check
Figure 2 is a side view of the circuit breaker
with the insulating barriers removed (if
furnished) to show the vacuum interrupter,
and the upper and lower connection pads.
All of these components must be clean and
free of dirt or any foreign objects. Use a dry
lint-free cloth. For stubborn dirt, use a clean
cloth dipped in isopropyl alcohol (except for
the vacuum interrupters). For stubborn dirt
on a vacuum interrupter use a cloth and
warm water and a small amount of mild
liquid-household detergent as a cleaning
agent. Dry thoroughly using a dry lint-free
cloth.
Inspection of flexible connectors
Inspect the flexible connectors that connect
the bottom movable contacts of the vacuum
interrupters to the lower connection pad for
tightness and absence of mechanical
damage, burning or pitting.
Checks of the stored-energy operator
mechanism
The stored-energy operator checks are
divided into mechanical and electrical
checks for simplicity and better
organization. This first series of checks
determine if the basic mechanism is clean,
lubricated and operates smoothly without
control power. The contact-erosion check of
the vacuum interrupter is also performed
during these tasks.