Smoothing Capacitor Life Curve; Life Alarming Output - Hitachi SJ Series User Manual

Chapter 19

19.7 Smoothing Capacitor Life Curve

Ambient temperature (°C)
50
40
30
20
10
0
-10
1
Note 1) The ambient temperature is a temperature
measured at a position about 5cm from the
bottom center of the inverter. (atmospheric
temperature)
If the inverter is stored inside the panel, it is
in-panel temperature.

19.8 Life Alarming Output

・When the life of component (smoothing capacitor or
cooling fan on the board, excluding the main circuit
smoothing capacitor) is near its end, an alarm can be
generated based on self-diagnosis. Use this alarm as a
sign of part replacement period. For details, see the life
diagnosis monitor [dC-16] and output terminal function
selection [CC-01] to [CC-07]. Note that alarms are
generated based on diagnosis of designed expected life
(not a guaranteed value). There will be differences due to
use environments, operating conditions, etc. Please
conduct maintenance in advance.
2 3 4 5 6
Maintenance and Inspection
* When the inverter is continuously driven at 80% of
ND rated current.
In the case of 24-hour energization/day
Capacitor life (years)
7 8 9 10
Note 2) The smoothing capacitor is a finite life
component which occurs chemical reaction
inside, replacement is required after 10 years
of use (It is a designed expected life, not a
guaranteed value).
However, if the inverter is used in an
environment at high temperature or in a
heavy-load environment where the its rated
current is exceeded, the life is significantly
shortened.
19-6