Citadel 2.0 - Instruction Manual - page:
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Hardware check
Inspect all fasteners for tightness. The Citadel mechanism uses both locknuts and retaining
rings. Replace any fasteners that appear to be unusually lose, worn, misshapen or in other
ways questionable.
Manual spring-charging and contact erosion checks
Perform the manual spring-charging check contained in the section describing the installation
check and initial functional tests (refer to page 17).
Spring Charging Motor
Operationally check the spring-charging motor via electrical operation If operating
smoothly - no additional checks of the spring charging motor are necessary.
If it should ever become necessary to replace the spring charging motor;
motor-mounting hardware should be torqued to 7.3-8 ft-lb (10-11 NM for 6.0 mm
8.8 grade bolt).
Anti-pump relay
Should it ever be necessary to remove the connections to the anti-pump relay, use care
to avoid damaging the relay and wiring connections.
Replace the relay if the relay terminals are damaged or loose in the relay body.
Vacuum interrupters
The life expectancy of vacuum interrupters is a function of the numbers of interruptions and
magnitude of current interrupted (refer to Vacuum Bottle Life graphs Figure 8, Page 34).
Vacuum interrupters must be replaced;
•
before the number of mechanical operations (Figure 8, Page 34 and Figure 9, Page 36)
are reached,
•
when the contacts have been eroded beyond allowed limits
•
or the interrupter(s) does not pass appropriate power frequency voltage withstand testing.
•
if the VI exhibits un-acceptably high and or unbalanced micro-ohm readings
Vacuum interrupter replacement procedures are available from the factory as separate
detailed sets of maintenance instructions.
Contact the factory to obtain instructions for your specific make, model and rating of
breaker and power pole design.
At that time, also check with the factory if video instructions are available to supplement
your understanding and maintenance efforts.
For vacuum interrupter replacement –
Customers should have maintenance procedures done by the factory or
factory trained field services personnel only.
ONLY factory NEW vacuum interrupters are to replace existing Citadel
interrupters. Always consider replacing vaccum interrupters as a set.
Except for hardware;
NEVER use any parts on a Citadel other than NBS supl\plied factory new.
M A I N T E N A N C E
