Mitsubishi Electric AE-SW Series Instruction Manual page 34

4.2 Periodic Inspections
It is recommended that periodic inspections are performed once about one month commencing use thereafter according to
the guidelines for inspection and renewal to ensure a stable, long-term use of the ACB.
4.2.1 External appearance of the ACB
Inspection item
1.Dust and soiling
2.Loosening of the main circuit
terminals
3.Loosening of control terminals
4.Cracks, breakage or deformation of
the front cover, base and control
circuit terminal block
5.Flooding, immersion in water
6.Drawout rail
4.2.2 Conductive parts of the main circuit (External view)
Inspection item
1.Measurement of insulation resistance
2.Soiling of the main circuit conductor
3.Discoloration and deformation
4.2.3 Arc extinguishing chamber and movable/fixed contact
Inspection item
1.Soot and stains
2.Breakage of the arc extinguishing
chamber
3.Condition of the arc extinguishing
plate
4. Movable/Fixed contacts
5.Loosening of the arc extinguishing
chamber fastening screw
4.2.4 Electronic trip relay
Inspection item
1.External appearance of
electronic trip relay
2.Dust and soiling
3.Operating characteristics of the
electronic trip relay
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Inspection method
Visual inspection
Tighten with a torque wrench.
Tighten with a screwdriver.
Visual inspection
There must be no flooding or
immersion.
Visual inspection
Inspection method
Measure the insulation resistance
with 500 V DC insulation resistance
tester (megohmmeter).
Visual inspection
Visual inspection
Inspection method
Visual inspection
Visual inspection
Visual inspection
Visual inspection
Tighten with a wrench for M6
screws.
Inspection method
the Visual inspection
Visual inspection
Measurement
Criteria
There must be no detrimental deposits
of dust and dirt.
Must be tightened securely.
(M12 screw : 40~50 N . m)
Must be tightened securely.
(M3.5 screw : 0.8~1.2 N . m)
There must be no cracks, breakage or
deformation.
There must be no flooding
immersion.
Rails must be inserted in and pulled
out smoothly.
Criteria
Must be no less than 5 MΩ. (must be
no less than 50 MΩ for the AE-SW
alone.)
Testing locations are shown in section
4.1.
There must be no detrimental deposits
of dust or soot.
There must be no detrimental
discoloration of the pressing spring.
Criteria
No detrimental deposits of dust and
dirt
There must be no breakage.
There must be no remarkable arc
extinguishing plate melded.
There must be no remarkable contact
wearing.
Must be tightened securely.
(M6 screw : 2.5~4 N . m)
Criteria
There must be no breakage or
deformation of the external parts and
the setting dials.
There must be no detrimental deposits
of dust and dirt.
Use the field test device (Y-2000) to
confirm that the characteristics are
within the standard values.
Treatment methods
Blow with air upon each periodic inspection
or clean and remove the dust with a dry
cloth.
Do not use any solvents, such as a thinner.
Retighten if necessary.
Retighten if necessary.
Please contact our company if any
abnormalities on the front cover or the
control circuit terminal block. Replace the
circuit breaker when the base is found to
have trouble.
or Replace the product if flooding or immersion
has occurred.
Please contact our company if any abnormalities
are found on the rail operation.
Treatment methods
Clean and dust off before re-measurement.
In case the insulation fails to recuperate,
replace the circuit breaker and drawout
cradle.
Clean the main conductor.
Replace the cradle if there are any
abnormalities.
Treatment methods
Remove dust and clean upon each
inspection.
Please contact our company if there are any
abnormalities.
Please contact our company if there are any
abnormalities.
Please contact our company if there are any
abnormalities.
Retighten if necessary.
Treatment methods
Please contact our company if there is any
breakage or deformation.
Remove the dust with a dry cloth.
Do not use any solvents, such as a thinner.
Please contact our company
measured values deviate from the standard
values.
if the