6. Troubleshooting and check
6-7
6.4. Part replacement
The following parts are subject to deterioration and failure of equipment due to mechanical
friction or aging. Therefore, periodical inspection and regular replacement are necessary for
preventive preservation.
1) Smoothing Capacitor: Aging characteristics due to ripple current. The life of a capacitor is
highly dependent on the ambient temperature and the operating conditions, but 10 years is
the standard for continuous operation under normal air-conditioning conditions. Aging of
capacitors proceeds rapidly over a period of time, so the inspection period should be checked
at least once a year (less than half a year when it is close to life).
As an external judgment standard of inspection matter
a. Condition of the case: side, bottom extension of the case
b. Condition of the lid: prominent expansion, extreme cracking, cracking
c. Explosion-proof condition: Significant extension of the sides, working
d. In addition, the service life is judged when the rated capacity of the capacitor regularly falls
below 85%, such as appearance, sheathing, cracking, discoloration, and leaking water.
2) Relays: Poor contact occurs due to contact wear caused by switching current. As it depends
on the power supply capacity, the life cycle is based on 100,000 cumulative switching times
(switching life).
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