Mitsubishi Electric AE-SW Series Instruction Manual page 38

4.2 Periodic inspection
To prevent accidents and use the breaker stably for a long period of time, we recommend an initial inspection to be per-
formed after 1 month of operation followed by periodic inspections according to the operation environment.
4.2.1 Appearance of the air circuit breaker
Inspection items
1. Debris, dust and soiling
2. Loose connection in the main circuit
terminal block
3. Loose connection in the control
circuit terminal block
4. Cracks, breakage, or deformation of
the front cover, base, or control
circuit terminal block
5. Flooding, immersion in water
6. Extension rail
7. Lost parts
4.2.2 Conductive parts of the main circuit (Appearance)
Inspection items
1. Insulation resistance measurement
2. Soiling of the main circuit terminals
and connection conductors
4.2.3 Arc-extinguishing chamber
Inspection items
1. Soot and soiling
2. Breakage
3. Looseness in xing screws
4.2.4 Electronic trip relay
Inspection items
1. Appearance of the
electronic trip relay
2. Debris, dust and soiling
3. Operation characteristics of the
electronic trip relay
E-38
Inspection methods
Visual check No debris, dust or dirt attached
Fasten with a torque wrench. Securely tightened
(M12 bolt: 45 ± 5N·m)
Fasten with a screwdriver. Securely tightened
(M3.5 screw: 1.0 ± 0.2N·m)
Visual check No cracks, breakage, or deformation
No ooding or water immersion No ooding or water immersion
Visual check The rail can be drawn out/inserted
smoothly.
Visual check None of the screws, nuts, washers, or
retaining rings are lost.
Inspection methods
Measure with a 500 V insulation 5 M or more (50 M or more for a
tester breaker alone). Refer to section
Visual check No debris, dust or soot attached
Inspection methods
Visual check It is clean.
Visual check No breakage
Fasten with a screwdriver. Securely tightened
(M6 screw: 3.25 ± 0.75N·m).
Inspection methods
No breakage or deformation of the
Visual check
external area or the setting dial
No debris, dust or dirt attached
Visual check
Values checked with a dedicated eld test
Measurement
device (Y-2005) are within reference values.
Criteria
Criteria
4.1 for measurement points.
Criteria
Criteria
Treatment
Vacuum with a vacuum cleaner during periodic
inspections, or clean with a dry cloth.
Do not use any solvents, such as thinner, on the
front cover and rating nameplates.
When loose, fasten at the speci ed torque.
When loose, fasten at the speci ed torque.
If any abnormality is found on the front cover or
the control circuit terminal block, please contact
your local branch of ce or agency. When there is
an abnormality on the base, replace the breaker.
In case of ooding or water immersion, replace the breaker.
If any abnormality is found with the rail,
contact your local branch of ce or agency.
If any parts are missing, contact your local
branch of ce or agency.
Treatment
Remove debris and dust with a dry cloth
and measure again.
If the insulation does not recover, replace
the breaker and the cradle.
Clean with a dry cloth.
Treatment
Take care not to let debris and dirt enter the
arc-extinguishing chamber, and vacuum them
with a vacuum cleaner or clean with a dry cloth.
If any abnormality is found, contact your
local branch of ce or agency.
Fasten at the speci ed torque.
Treatment
If any breakage or deformation is found,
contact your local branch of ce or agency.
Clean with a dry cloth.
Do not use any solvents, such as thinner.
If the value is outside of the reference values,
contact your local branch of ce or agency.