
80
Inspection
item
Inspection
content
Inspection period
Inspection
method
Assessment
base
Corrective
measures to fault
Daily
Annual
Radiator
Check no dust or
chipping stacked
Yes
View inspection
All OK
Remove stacking
such as dust
Printing
circuit board
Check no
inductive metal
or oil stacked
Yes
View inspection
All OK
Remove or replace
electric board
Check elements
are exclusive of
color changing
or burning due to
overheat
Yes
Cooling fan
Check abnormal
vibration or
noise
Yes
View inspection
and auditory
inspection
All OK
Replace cooling fan
Check no dust or
chipping stacked
Yes
View inspection
Remove
Power
elements
Check no dust or
chipping stacked
Yes
View inspection
All OK
Remove
Check
resistance
between
terminals
Yes
Check using
universal meter
No short circuit
or circuit break
for three phase
output
Replace power
elements or inverter
Condenser
Check for odor
or leakage
Yes
View inspection
All OK
Replace
condenser or
inverter
Check for
expansion or
distortion
Yes
Always inspection and maintenance is not necessary for the inverter.
For long time safety operation, periodical inspection shall be prepared to the inverter in accordance with descriptions
below. Inspection shall only perform after power supply is off for several minutes. (since residual voltage may exist in
the large capacity condensers.)
(1) Remove dirty stacking inside the machine
(2) Check screws securing terminals or elements are securely tightened; if not, tighten the screws