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5.1.3
Daily and periodic inspection list
Area of
Inspection item
inspection
Surrounding
environment
General
Overall unit
Power supply voltage
General
Conductors and
cables
Main
Transformer/
circuit
Reactor
Terminal block
Smoothing aluminum
electrolytic
capacitor
Relay/contactor
Operation check
Control
Overall
circuit,
protective
circuit
Aluminum
electrolytic
capacitor
Cooling fan
Cooling
system
Heatsink
Indication
Display
Meter/counter
∗1
It is recommended to install a voltage monitoring device for checking the voltage of the power supplied to the converter.
∗2
One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
Consult us for periodic inspection.
∗3
Oil component of the heat dissipation grease used inside the converter may leak out. The oil component, however, is not flammable, corrosive,
nor conductive and is not harmful to humans. Wipe off such oil component.
NOTE
• Continuous use of a leaked, deformed, or degraded smoothing aluminum electrolytic capacitor (as shown in the table above)
may lead to a burst, breakage, or fire. Replace such capacitor without delay.
Description
Check the surrounding air temperature, humidity, dirt,
corrosive gas, oil mist, etc.
Check for unusual vibration and noise.
Check for dirt, oil, and other foreign material.
Check that the main circuit voltage and control circuit
voltage are normal.
∗1
(1) Check with megger (between main circuit terminals
and earth (ground) terminal).
(2) Check for loose screws and bolts.
(3) Check for overheat traces on the parts.
(4) Check for stains.
(1) Check conductors for distortion.
(2) Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.).
Check for unusual odor and abnormal increase of
whining sound.
Check for a damage.
(1) Check for liquid leakage.
(2) Check for safety valve projection and bulge.
(3) Visual check
Check that the operation is normal and no chattering
sound is heard.
Check that no fault is found in protective and display
circuits in a sequence protective operation test.
(1) Check for unusual odor and discoloration.
(2) Check for serious rust development.
(1) Check for liquid leakage in a capacitor and
deformation trace.
(2) Visual check
(1) Check for unusual vibration and noise.
(2) Check for loose screws and bolts.
(3) Check for stains.
(1) Check for clogging.
(2) Check for stains.
(1) Check that indications are correct.
(2) Check for stains.
Check that readouts are correct.
PRECAUTIONS FOR MAINTENANCE AND INSPECTION
Inspection
interval
Corrective action at
fault occurrence
Periodic
Daily
∗2
Improve the environment.
Check fault location and
retighten.
Clean.
∗3
Inspect the power supply.
Contact the manufacturer.
Retighten.
Contact the manufacturer.
Clean.
Contact the manufacturer.
Contact the manufacturer.
Stop the equipment and
contact the manufacturer.
Stop the equipment and
contact the manufacturer.
Contact the manufacturer.
Contact the manufacturer.
Contact the manufacturer.
Contact the manufacturer.
Stop the equipment and
contact the manufacturer.
Contact the manufacturer.
Contact the manufacturer.
Replace the fan.
Retighten.
Clean.
Clean.
Clean.
Contact the manufacturer.
Clean.
Stop the equipment and
contact the manufacturer.
Inspection item
Check by
user
5
147
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