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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 service life of about 30,000 hours (about 2 or 3 years of continuous
operation). 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 5 years under normal conditions. Since the
smoothing capacitor is mounted on a printed circuit board circuit board, it needs to be replaced together with the circuit board.
<Criteria for appearance check>
･ Absence of liquid leak
･ Safety valve In the depressed position
･ Measurement of electrostatic capacitance and insulation resistance
Note: The operation time is helpful for roughly determining the time of replacement. For the replacement of parts, contact your
nearest Maeda distributor. For safety’s sake, never replace any part on your own. (Parts replacement alarms can be known
by monitor and alarm output, if it is set.)
■ Standard replacement cycles of principal parts
As guides, The table below lists part replacement cycles that wear estimated based on the assumption that the inverter would be
used in a normal use environment under normal conditions (ambient temperature, ventilation conditions, and energizing time).
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
Cooling fan 2 to 3 years Replacement with a new one
Main circuit smoothing aluminum electrolytic
capacitor
5 years Replacement with a new one
Relay and contactor - Whether to replace or not depends on the check results
Aluminum electrolytic capacitor mounted on a
printed circuit board
5 years Replacement with a new one
Note) The life of a part greatly varies depending on the environment of use.
2.5 DISPOSAL OF THE INVERTER
k WARNING
Mandatory
• If you throw away the inverter, have it done by specialist in industry waste disposal (*). If you throw
away the inverter by yourself, this can result in explosion of capacitor or produce noxious gases,
resulting in injury.
(*) Persons who specialize in the processing of waste and known as “industrial waste product
collectors and transporters” or “industrial waste disposal persons”. If the collection, transport and
disposal of industrial waste is done by someone who is not licensed for that job, it is a punishable
violation of the law. (Laws in reqard to cleaning and processing of waste materials)
For safety’s sake, do not dispose of the disused inverter yourself but ask an industrial waste disposal agent.
Disposing of the inverter improperly could cause its capacitor to explode and emit toxic gas, causing injury to persons.
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