273
Inspection items
6.1.3 Daily and periodic inspection
The oil component of the heat dissipation grease used inside the drive unit may leak out. The oil component, however, is not flammable, corrosive, nor
conductive and is not harmful to humans. Wipe off such an oil component with a cloth, etc.
It is recommended to install a device to monitor voltage for checking the power supply voltage to the drive unit.
One to two years of periodic inspection cycle is recommended. However, it differs according to the installation environment.
For a periodic inspection, contact your sales representative.
Area of
Inspection
Inspection Item
Description
Interval
Corrective Action at
Alarm Occurrence
Customer's
Check
Daily
Periodic
General
Surrounding
environment
Check the surrounding air temperature,
humidity, dirt, corrosive gas, oil mist, etc.
Improve environment
Overall unit
Check for unusual vibration and noise.
Check alarm location and
retighten
Check for dirt, oil, and other foreign
material.
Clean
Power supply voltage
Check that the main circuit 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 parts.
Contact the manufacturer
(4) Check for stains.
Clean
Conductors, cables
(1) Check conductors for distortion.
(2) Check cable sheaths for breakage and
deterioration (crack, discoloration, etc.)
Contact the manufacturer
Contact the manufacturer
Terminal block
Check for damage.
Stop the device 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
page 274).
Relay
Check that the operation is normal and no
chatter is heard.
Contact the manufacturer
Control
circuit,
Protective
circuit
Operation check
(1) Check that the output voltages across
phases with the drive unit operated
alone is balanced
Contact the manufacturer
(2) Check that no fault is found in protective
and display circuits in a sequence
protective operation test.
Contact the manufacturer
P
ar
ts ch
ec
k
Overall
(1) Check for unusual odors and
discoloration.
Stop the device 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 main circuit capacitor
(refer to
page 274).
Cooling
system
Cooling fan
(1) Check for unusual vibration and noise.
Replace the fan
(2) Check for loose screws and bolts
Fix with the fan cover
fixing screws
(3) Check for stains.
Clean
Heatsink
(1) Check for clogging
Clean
(2) Check for stains.
Clean
Display
Indication
(1) Check that display is normal.
Contact the manufacturer
(2) Check for stains.
Clean
Meter
Check that reading is normal
Stop the device and
contact the manufacturer.
Load motor Operation check
Check for vibration and abnormal increase
in operation noise
Stop the device and
contact the manufacturer.
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 a fire. Replace such a capacitor without delay.
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