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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, which cools down heat-generating parts, has a typical service life of about 30,000 hours (about 7 years)
(average ambient temperature: 40°C, operation time: 12 hours per day). The fan also needs to be replaced if it
makes a noise or vibrates abnormally.
2) DC bus capacitor
The aluminum electrolytic capacitor in the main circuit DC section degrades in performance because of ripple
currents, etc. It is recommended to replace the capacitor after it is used for about 5 years under normal conditions
(average ambient temperature: 40°C, load factor: not more than 80%, operation time: 12 hours per day). For the
inverter 5015PM to 5075PM, replace the capacitor together with the printed circuit board.
<Criteria for appearance check>
• Absence of liquid leak
• Safety valve in the depressed position
• Measurement of electrostatic capacitance and insulation resistance
Note: When it becomes necessary to replace expendable parts, contact your supplier. For safety's sake, never
replace any part on your own.
By checking the cumulative operating time and the part replacement alarm information, you can get a rough idea of
when each part should be replaced. For the replacement of parts, contact the service network or your supplier.
(Operation hours can be known by alarm output, if it is set. For more details, refer to Section 6.33.12.)
Typical maintenance schedule for parts able to be replaced
The table below provides a listing of the replacement cycles of parts when used under normal conditions (average
ambient temperature: 40°C, load factor: not more than 80%, operation time: 12 hours per day). The replacement
cycle of each part does not mean its service life but the number of years over which its failure rate does not increase
significantly.
Part name Standard replacement cycle Replacement mode and others
5015PM to 5075PM and
6022PL to 6900PL
5 years Replacement with a new one
5 years (Inside air cooling fan)
Cooling fan
6110KPC or larger
10 years (Outside air cooling fan)
Replacement with a new one
DC bus capacitor 5 years
Replace with a new one
(depending on the check results)
Circuit breaker and relays -
Whether to replace or not
depends on the check results
Aluminum capacitor on printed circuit board 5 years
Replace with a new circuit board
(depending on the check results)
Note: The life of a part greatly varies depending on the environment of use. Do not install in any location where there are large
amounts of dust, metallic fragments and oil mist.