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Toshiba Tosvert VF-AS1 Instruction Manual Page 331

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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 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.
Remove the portion A and then portion B in the following figure to remove the cooling fan.
ex) VFAS1-2004PL UNIT
2) Smoothing capacitor
The smoothing aluminum electrolytic capacitor in the main circuit DC section degrades in performance because of
ripple currents, etc. 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 (average ambient temperature: 40°C, load factor: not more than 80%, operation
time: 12 hours per day). 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 Toshiba distributor. 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 Toshiba
distributor. (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: 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
(200V/55kW models and
400V/90kW models or smaller)
Cooling fan
(200V/75kW models and
400V/110kW models or larger)
Smoothing capacitor
Circuit breaker and relays
Aluminum capacitor on printed circuit board
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.
(A)
(B)
(1)
Standard replacement cycle
5 years
5 years (Inside air cooling fan)
10 years (Outside air cooling fan)
5 years
-
5 years
N-3
E6581442
(2)
Replacement mode and others
Replacement with a new one
Replacement with a new one
Replace with a new one
(depending on the check results)
Whether to replace or not depends
on the check results
Replace with a new circuit board
(depending on the check results)
14

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