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Chapter 6
6.6 Smoothing capacitor life span curve
※80% of the ND rated current value for continuous drive.
Ambient temperature (°C)
50
40
30
20
10
0
-10
1
*1)The ambient temperature is considered to be
measured around 5 cm of the bottom centre of the
inverter (Atmosphere temperature). If the inverter is in
an enclosure, it will be the temperature inside the case.
6.7 Lifespan alarm output
・Thanks to the self-diagnostic, you can output an alarm in
regards of the inverter own internal components lifespan
when the lifespan is nearing to its end (Including the circuit
board smoothing capacitor and cooling-fan, and excluding the
main circuit smoothing capacitor). Use this to get a reference
for when the components should be replaced. Particularly,
consult the lifespan diagnosis monitor [dC-16] and the
output terminal function selection [CC-01]～[CC-07].
It should be noted that the warning itself is based on the
design lifespan, and thus, is not a guaranteed measurement.
Depending on the environment, the operation conditions, etc.
problems may arise, to avoid that, is recommended an early
maintenance.
2
3
4
5
6
Inspection and maintenance
※80% of the ND rated current value for continuous drive.
For continuous supplying
power of 24h a day
Capacitor life span
(years)
7
8
9
10
*2) The smoothing capacitor has a limited life because of
the chemical reactions occurring inside the capacitor
while operating. The capacitor should be replaced after
10 years of use, as a reference standard (10 years is not
the guaranteed lifespan, but rather, the design lifespan).
Note that the smoothing capacitor lifespan will be
shortened if the inverter is used at a high ambient
temperature or with a heavy load that requires a
current beyond the rated current.
6-5
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