Toshiba Tosvert VF-AS1 - Manual (Page 305)

E6581301
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.
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.
(A) (B)
(1)
(2)
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.
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.)
■ 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
Standard
replacement cycle
Replacement mode and others
Cooling fan 5 years Replacement with a new one
Smoothing 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.