Inspection
8.1.3
Daily and periodic inspection
Inspection
Description
Item
Surrounding
Check the ambient temperature, humidity, dirt,
environment
corrosive gas, oil mist , etc.
Check for unusual vibration and noise.
Overall unit
Check for a smear like adhered foreign material
and oil.
Power supply
Check that the main circuit voltages are normal.
voltage
1) Check with megger (across main circuit
terminals and earth (ground) terminal).
2) Check for loose screws and bolts.
General
3) Check for overheat traces on the parts.
4) Check for stain
1) Check conductors for distortion.
Conductors,
cables
2) Check cable sheaths for breakage
Transformer/
Check for unusual odor and abnormal increase in
reactor
whining sound.
Terminal block Check for damage.
1) Check for liquid leakage.
Smoothing
aluminum
2) Check for safety valve projection and bulge.
electrolytic
3)Visual check and judge by the life check of the
capacitor
main circuit capacitor (Refer to section 8.1.4.)
Relay/
Check that the operation is normal and no chatter is
contactor
heard.
1) Check that the output voltages across phases
with the inverter operated alone is balanced.
Operation
2) Check that no fault is found in protective and dis-
check
play circuits in a sequence protective operation
test.
1) Check for unusual odor and discoloration.
Overall
2) Check for serious rust development.
1)Check for liquid leakage in a capacitor and defor-
Alumi-
mation trance
num elec-
trolytic
2) Visual check and judge by the life check of the
capacitor
control circuit capacitor. (Refer to section 8.1.4.)
1) Check for unusual vibration and noise.
Cooling fan
2) Check for a tight fit of the fan cover.
3) Check for stain.
1) Check for clogging.
Heatsink
2) Check for stain.
Tab. 8-1:
Daily and periodic inspection (1)
8 - 2
Maintenance and inspection
Interval
Corrective Action at Alarm
Occurrence
✔
Improve environment
✔
Check alarm location and retighten
✔
Clean
✔
Inspect the power supply
✔
Contact the manufacturer
✔
Retighten
✔
Contact the manufacturer
✔
Clean
✔
Contact the manufacturer
✔
Contact the manufacturer
Stop the device and contact the
✔
manufacturer.
Stop the device and contact the
✔
manufacturer.
✔
Contact the manufacturer
✔
Contact the manufacturer
✔
✔
Contact the manufacturer
✔
Contact the manufacturer
✔
Contact the manufacturer
Stop the device and contact the
✔
manufacture
✔
Contact the manufacturer
✔
Contact the manufacturer
✔
✔
Replace the fan
Insert hooks of the fan cover into the
✔
holes until you hear a click sound.
✔
Clean
✔
Clean
✔
Clean