E-49
ENGLISH
Perform the user inspection described in this section once about a month after starting use. After that, perform
the inspection depending on the usage environment. For the periodic inspection (performed by an after-sale
service person) in section 22.1, contact the sales representative or Mitsubishi Electric sales office.
22.3.2-1 External appearance of the circuit breaker
22.3.2 User Inspection
Inspection item
Inspection method
Criteria
Treatment
1. Dust or soil
Visual inspection
There must be no
detrimental deposits of dust
or dirt.
Blow with air upon each periodic inspection or
clean and remove the dust with a drycloth. Do not
use any solvents, such as a thinner.
2. Loosening of the main
circuit terminals
Tighten with a
torque wrench.
Must be tightened securely.
(M12 screw: 45±5 N·m)
Retighten if necessary.
3. Loosening of control
terminals
Tighten with a
screwdriver.
Must be tightened securely.
(M3.5 screw: 1.0±0.2 N·m)
Retighten if necessary.
4. Cracks, breakage,
deformation, or
discoloration of the front
cover, base, control
circuit terminal block, and
other parts
Visual inspection
There must be no cracks,
breakage, deformation, or
discoloration.
Please contact our company if any abnormalities
on the front cover, base, or the control circuit
terminal block, etc. Replace the circuit breaker if
the base is found to have trouble.
5. Flooding, immersion in
water
Visual inspection
Must be no trace of flooding
or immerision.
Replace the product if flooding or immersion has
occurred.
6. Drawout operation
Visual inspection
Rails must be inserted in
and pulled out smoothly.
Please contact our company if any abnormalities
are found on the rail operation.
22.3.2-2 Conductive parts of the main circuit (External appearance)
22.3.2-3 Arc extinguishing chamber and movable/fixed contact
22.3.2-4 Electronic trip relay
Inspection item
Inspection method
Criteria
Treatment
1. Measurement of
insulation resistance
Measure the insulation
resistance with 500 V DC
insulation resistance tester
(megohmmeter).
Must be no less than 5 M
Ω
.
(must be no less than 50 M
Ω
for
the AED-CV alone.)
Testing locations are shown in
section 22.1.
Clean and dust off before
re-measurement. In case the
insulation fails to recuperate,
replace the circuit breaker and
drawout cradle.
2. Soiling of the main circuit
conductor
Visual inspection
There must be no detrimental
deposits of dust or soot.
Clean the main conductor.
3. Misconnection of the
junction
Visual inspection
Must be no deformation and
drop of the junction.
Replace the cradle if there are
any abnormalities.
Inspection item
Inspection method
Criteria
Treatment
1. Soot or stains
Visual inspection
No detrimental deposits of dust
or dirt.
Remove dust and clean upon
each inspection.
2. State of the arc
extinguishing chamber
Visual inspection
1. There must be no breakage.
Please contact Mitsubishi
Electric if there are any
abnormalities.
2. There must be no remarkable
arc extinguishing plate
melded.
3. Movable/Fixed contacts
Visual inspection
There must be no remarkable
contact wearing.
Please contact Mitsubishi
Electric if there are any
abnormalities.
4. Loosening of the arc
extinguishing chamber
fastening screw
Tighten with a screw driver for
M6 screws.
Must be tightened securely.
(M6 screw: 5.4±0.8 N·m)
Retighten if necessary.
Inspection item
Inspection method
Criteria
Treatment
1. External appearance of
the ETR
Visual inspection
There must be no breakage or
deformation of the external parts
and the setting dials.
Please contact Mitsubishi
Electric if there is any breakage
or deformation.
2. Dust or soil
Visual inspection
There must be no detrimental
deposits of dust and dirt.
Remove the dust with a dry
cloth. Do not use any solvents,
such as a thinner.
3. Operating characteristics
of the ETR
Use the field test device
(Y-2005)
Use the field test device
(Y-2005) to confirm that the
characteristics are within the
standard values.
Please contact Mitsubishi
Electric if the measured values
deviate from the standard
values.
