Mitsubishi Electric MELIPM Series Instruction Manual page 47

Table 6-5 Periodic Inspection List
Area of
Inspection
1) Check ambient temperature,
humidity, vibration, ambience
(for dust, dirt, gas, oil mist,
Surrounding
water drops, etc.)
environment
2) Check for tools, foreign matter
and dangerous articles in the
periphery.
Check for unusual vibration and
Overall unit
unusual noise.
1) Check for loose screws and
bolts.
2) Check parts and members for
deformation, crack, damage,
General
and discoloration caused by
overheat or deterioration.
3) Check for contamination and
sticking dust and dirt.
1) Check conductors for
discoloration and distortion
Conductors,
caused by overheat.
cables
2) Check cable sheaths for
breakage and discoloration.
Terminal Check for damage.
block
1) Check for liquid leakage,
discoloration, crack and
Smoothing casing expansion.
capacitor 2) Check for projected safety
valve.
3) Measure capacitance.
Check for foul odor and
Resistor
insulation crack due to overheat.
1) Check for loose screws, bolts
and connectors.
2) Check for unusual odor and
Control
discoloration.
printed
3) Check for crack, damage,
circuits,
deformation, and rust.
connectors
4) Check capacitor for liquid
leakage and traces of
deformation.
1) Check for sticking foreign
matter.
Cooling fan
2) Check for loose connection.
Check for clogged heat sink,
Ventilation
suction/exhaust ports, and
path
sticking foreign matter.
Inspection Items
6-8
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6. TROUBLESHOOTING
Methods
1) Measure visually
or with
instruments.
• Thermometer
• Hygrometer
• Recorder
2) Visual check.
Visual and auditory
checks.
1) Retighten.
2), 3) Visual check.
1), 2) Visual check. 1), 2) No fault.
Visual check.
1), 2) Visual check.
3) Use capacitance
meter for
measurement.
Olfactory, visual
checks.
1) Retighten.
2) Olfactory, visual
checks.
3), 4) Visual check.
1) Hand turn.
2) Visual check
Visual check.
Criteria
1) Standard
specification
values must
be satisfied.
2) Must not be
left
unremoved.
No fault.
1), 2), 3)
No fault.
No fault.
1), 2) No fault.
3) 85% or more
of rated
capacitance.
No fault.
1), 2), 3), 4)
No fault.
1) Smooth turn.
2) No fault.
No fault.