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â– Replacement of expendable parts
The inverter is composed of a large number of electronic parts including semiconductor devices.
The following parts deteriorate with the passage of time because of their composition or physical properties.
The use of aged or deteriorated parts leads to degradation in the performance or a breakdown of the
inverter. To avoid such trouble, the inverter should be checked periodically.
Note) Generally, the life of a part depends on the ambient temperature and the conditions of use. The life
spans listed below are applicable to parts when used under normal environmental conditions.
1) Cooling fan
The fan for cooling heat-generating parts has a service life of about ten years. The fan also needs to be
replaced if it makes a noise or vibrates abnormally.
2) Smoothing capacitor
The smoothing aluminum electrolytic capacitor in the main circuit DC section degrades in performance
because of ripple currents, etc. It becomes necessary to replace the capacitor after it is used for about
10 years under normal conditions. Since the smoothing capacitor is mounted on a printed circuit board,
it must be replaced together with the circuit board.
<Criteria for appearance check>
ï‚· Absence of liquid leak
ï‚· Safety valve in the depressed position
ï‚· Measurement of electrostatic capacitance and insulation resistance
Note: Checking the life alarm function is useful for roughly determining the parts replacement time.
To ensure customer safety, you should never replace parts on your own. (It is also possible to
monitor the part replacement alarm and output a signal.)
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