Appendices
A - 2
High-function General-purpose Inverter 3G3RX-V1 User’s Manual (I578-E1)
A-1 Smoothing Capacitor Life Curve
The following graph shows the relationship between the ambient temperature and the life expectancy of
the smoothing capacitor that is built into the inverter.
• “Ambient temperature” refers to the temperature measured at a distance of approximately 5
cm from the bottom center of the inverter (atmospheric temperature). It refers to an interior
temperature if the inverter is stored in a cabinet.
• The smoothing capacitor has a limited life because it is subjected to chemical reaction inside
the part and, as a guide, needs to be replaced once a decade approximately. However, this
period is an expected design life, and not the guaranteed value.
Remember that, if the inverter is used at a high ambient temperature or in a heavy loaded
environment, such as at the over-rated current, its life will be significantly shortened.
Ambient
temperature
[ºC]
50
40
30
20
10
0
-10
12
3
45 6 78910
Capacitor life [Year]
In case of electrification for 24 hours a day
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