Inspection item
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
89
5
5.1.3
Daily and periodic inspection
Area of
inspection
Inspection
item
Description
Inspection
interval
Corrective action
at fault
occurrence
Check
by the
user
Daily
Periodic
General
Surrounding
environment
Check the ambient temperature, humidity, dirt,
corrosive gas, oil mist, etc.
Improve the
environment.
Overall unit
Check for unusual vibration and noise.
Check fault location
and retighten.
Check for dirt, oil, and other foreign material.
Clean.
Power supply
voltage
Check that the main circuit voltages and control
voltages are normal.
Inspect the power
supply.
Main
circuit
General
(1) Check with megger (across main circuit
terminals and earth (ground) terminal).
Contact the
manufacturer.
(2) Check for loose screws and bolts.
Retighten.
(3) Check for overheat traces on the parts.
Contact the
manufacturer.
(4) Check for stain.
Clean.
Conductors,
cables
(1) Check conductors for distortion.
Contact the
manufacturer.
(2) Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
Contact the
manufacturer.
Transformer/
reactor
Check for unusual odor and abnormal increase of
whining sound.
Stop the equipment
and contact the
manufacturer.
Terminal block
Check for a damage.
Stop the equipment
and contact the
manufacturer.
Smoothing
aluminum
electrolytic
capacitor
(1) Check for liquid leakage.
Contact the
manufacturer.
(2) Check for safety valve projection and bulge.
Contact the
manufacturer.
(3) Visual check and judge by the life check of the
main circuit capacitor. (Refer to
Relay/
contactor
Check that the operation is normal and no
chattering sound is heard.
Contact the
manufacturer.
Resistor
(1) Check for crack in resistor insulation.
Contact the
manufacturer.
(2) Check for a break in the cable.
Contact the
manufacturer.
Control
circuit,
protective
circuit
Operation
check
(1) Check that the output voltages across phases
are balanced while operating the inverter
alone.
Contact the
manufacturer.
(2) Check that no fault is found in protective and
display circuits in a sequence protective
operation test.
Contact the
manufacturer.
Components check
Overall
(1) Check for unusual odor and discoloration.
Stop the equipment
and contact the
manufacturer.
(2) Check for serious rust development.
Contact the
manufacturer.
Aluminum
electrolytic
capacitor
(1) Check for liquid leakage in a capacitor and
deformation trace.
Contact the
manufacturer.
(2) Visual check and judge by the life check of the
control circuit capacitor. (Refer to
Cooling
system
Cooling fan
Internal fan
(1) Check for unusual vibration and noise.
Replace the fan.
(2) Check for loose screws and bolts.
Check fault location
and retighten.
(3) Check for stain.
Clean.
Heat sink
(1) Check for clogging.
Clean.
(2) Check for stain.
Clean.
