Inspection item
NOTE
When using the safety stop function, periodic inspection is required to confirm that safety func-
tion of the safety system operates correctly.
For more details, refer to the Safety stop function instruction manual.
7.1.3
Daily and periodic inspection
Area of in-
Inspection item
spection
Surrounding
environment
Overall unit
General
Power supply
voltage
General
Conductors, cables
Main
Transformer/reactor
circuit
Terminal block
Smoothing
aluminium
electrolytic capacitor
Relay/contactor
Operation check
Control
circuit,
protective
Overall
circuit
Aluminium
electrolytic
capacitor
Tab. 7-1:
Daily and periodic inspection (1)
7 - 2
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 voltages and control
voltages are normal.
(1) Check with megger (across 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 stain.
(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 and judge by the life check of the
main circuit capacitor. (Refer to page 7-6.)
Check that the operation is normal and no
chattering sound is heard.
(1) Check that the output voltages across phases
are balanced while operating the inverter alone.
(2) 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 and judge by the life check of the
control circuit capacitor. (Refer to page 7-6.)
Precautions for maintenance and inspection
Inspection
interval
Corrective action at
fault occurrence
Improve the
environment.
Check fault location and
retighten.
Clean.
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.
Contact the
manufacturer.
Stop the equipment and
contact the
manufacturer.
Contact the
manufacturer.
Contact the
manufacturer.
Check by
the user
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