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E6581090
N-3
14
■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.
No parts of the inverter except the cooling fan can be replaced individually, and the whole inverter
needs to be replaced if a significant defect is found in it.
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.
<Criteria for appearance check>
• Absence of liquid leak
• Safety valve in the depressed position
• Measurement of electrostatic capacitance and insulation resistance
Note: For the replacement of consumable parts, ask your nearest Toshiba branch or office.
The operation time is helpful for roughly determining the time of replacement. For the replacement
of parts, contact the service network or Toshiba branch office printed on the back cover of this
instruction manual.
■Standard replacement cycles of principal parts
The table below provides a listing of the replacement cycles of parts when used under normal
conditions (average ambient temperature: 30°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
Cooling fan 2 to 3 years Replacement with a new one
Smoothing capacitor 5 years
Replace with a new one (depending on
the check results)
Contactors and relays -
Whether to replace or not depends on
the check results
Timer -
Whether to replace or not depends on
the operation time
Fuse 10 years Replacement with a new one
Aluminum capacitor on printed
circuit board
5 years
Replace with a new circuit board
(depending on the check results)
(Extract from "Guide to periodical inspections of general-purpose inverters" issued by the Japan
Electrical Manufacturers’ Association.)
Note) The life of a part greatly varies depending on the environment of use.