Toshiba VF-AS1 Replacement of expendable parts, Standard replacement cycles of principal parts

! E6581301!

■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.

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%, op eration 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 th an 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
	(200V/55kW models and	5 years	Replacement with a new one
	400V/90kW models or smaller)
Cooling fan	(200V/75kW models and	5 years (Inside air cooling fan)
			Replacement with a new one
	400V/110kW models or larger)	10 years (Outside air cooling fan)
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.

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