597
7. PRECAUTIONS FOR MAINTENANCE AND INSPECTION
7.1 Inspection item
3
4
5
5
5
5
7
8
9
10
7.1.3 Daily and periodic inspection
Area of
inspection
Inspection item Description Inspection
interval
Corrective action
at fault occurrence
Check
by the
user
Daily Periodic
*3
General Surrounding environment Check the surrounding air 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.
*1
 Clean.
Power supply voltage Check that the main circuit voltages and
control voltages are normal.
*2
 Inspect the power
supply.
Main circuit General Check with megger (across main circuit
terminals and earth (ground) terminal).
 Contact the
manufacturer.
Check for loose screws and bolts.  Retighten.
Check for overheat traces on the parts.  Contact the
manufacturer.
Check for stain.  Clean.
Conductors, cables Check conductors for distortion.  Contact the
manufacturer.
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
Check for liquid leakage.  Contact the
manufacturer.
Check for safety valve projection and bulge.  Contact the
manufacturer.
Visual check and judge by the life check of
the main circuit capacitor. (Refer to page
600.)

Relay/contactor Check that the operation is normal and no
chattering sound is heard.
 Contact the
manufacturer.
Control
circuit,
protective
circuit
Operation check Check that the output voltages across
phases are balanced while operating the
inverter alone.
 Contact the
manufacturer.
Check that no fault is found in protective
and display circuits in a sequence
protective operation test.
 Contact the
manufacturer.
Components
check
Overall Check for unusual odor and discoloration.  Stop the equipment
and contact the
manufacturer.
Check for serious rust development.  Contact the
manufacturer.
Aluminum
electrolytic
capacitor
Check for liquid leakage in a capacitor and
deformation trace.
 Contact the
manufacturer.
Visual check and judge by the life check of
the control circuit capacitor. (Refer to page
600
.)

C
ooling
system
Cooling fan Check for unusual vibration and noise.  Replace the fan.
Check for loose screws and bolts.  Fix with the fan
cover fixing screws
Check for stain.  Clean.
Heat sink Check for clogging.  Clean.
Check for stain.  Clean.
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