Inspection point
Inspection item
Inspection method
Criteria
C
o
n
tr
o
l c
ir
cu
it
Printed
circuit board
and
connectors
1) Check for loose screws and
connectors.
2) Check for odor and discoloration.
3) Check for cracks, breakage,
deformation and remarkable rust.
4) Check the capacitors for electrolyte
leaks and deformation.
1) Retighten.
2) Olfactory and visual
inspection
3), 4)
Visual inspection
1), 2), 3), 4)
No abnormalities
C
ool
ing s
ys
te
m
Cooling fans 1) Check for abnormal noise and
excessive vibration.
2) Check for loose bolts.
3) Check for discoloration caused by
overheat.
1) Auditory and visual
inspection, or turn
manually (be sure to turn
the power OFF).
2) Retighten.
3) Visual inspection
4) Life judgment based on
maintenance info (See
Note
below.)
1) Smooth rotation
2), 3)
No abnormalities
Ventilation
path
Check the heat sink, intake and exhaust
ports for clogging and foreign materials.
Visual inspection
No abnormalities
Remove dust accumulating on the converter with a vacuum cleaner. If the converter is stained, wipe it off with a
chemically neutral cloth.
Note: Life judgment based on maintenance info
Refer to the maintenance info shown on the converter keypad for the life judgment of the electrolytic capacitors on
the control printed circuit board and that of the cooling fans. Use the info as a guide for the replacement timing.
(1) Life of electrolytic capacitor on the control printed circuit board
The actual capacitance of the capacitor is not measured but the cumulative power-on time of the control power is
displayed. The time counter increases in units of hours and ignores the time shorter than an hour.
The actual life of the electrolytic capacitor depends largely on the temperature. Use the data merely as a guide.
(2) Life of cooling fan
The cumulative run time of the cooling fan is displayed. The time counter increases in units of hours and ignores the
time shorter than an hour.
The actual life of the fan depends largely on the temperature. Use the data merely as a guide.
Table 8.2-2 Life Judgment Based on Maintenance Info
Parts
Judgment level
Electrolytic capacitor on control printed circuit board
87,600 hours
Cooling fan
87,600 hours
*1
*1
Life expectancy of the cooling fan at an ambient converter temperature of 30°C
8-3
