Toshiba TOSVERT VF-AS1 Instruction Manual page 290

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. For the inverter that applicable motor output is 15kW (200V)-18.5kW (400V) or less, 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.
The operation time is helpful for roughly determining the time of replacement. 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.)
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
Cooling fan
Smoothing capacitor
Circuit breaker and relays
Timer
Fuse
Aluminum capacitor on printed circuit
board
(Extract from "Guide to periodical inspections of general-purpose inverters" issued by the Japan Electric Industries
Association.)
Note: The life of a part greatly varies depending on the environment of use.
Standard
replacement cycle
2 to 3 years Replacement with a new one
5 years Replace with a new one (depending on the
check results)
- Whether to replace or not depends on the
check results
- Whether to replace or not depends on the
operation time
10 years Replacement with a new one
5 years Replace with a new circuit board (depending on
the check results)
N-3
Replacement mode and others
E6581301
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