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M-3
Replacement of expendable parts
The inverter incorporates a great deal of electronic parts such as semiconductors, etc. The
following parts deteriorate because of their constructions, physical characteristics and aging.
If those parts are used as they have aged, it may cause the inverter to deteriorate in
performance and to become faulty. Such being the case, the inverter needs periodical
inspection for preventing itself from failure and deterioration.
Note: Service life of part is affected by ambient temperature and operating conditions. Service life of
main parts shown below is just standard when the inverter is used in the usual environmental
conditions.
1) Cooling fan
Service life of the cooling fan to cool down heat generation parts is 30000 hours (2 to 3
years under continuous operation) approximately. If it generates unusual noise or
vibration, it is a sign of replacement.
2) Aluminum electrolytic capacitor
The aluminum electrolytic capacitor of the DC main circuit deteriorates in characteristic
because of influence of ripple current, etc. If the inverter is used in the usual operating
condition, the capacitor needs to replace every five years. For the inverter that applicable
motor output is 3.7 kW or less, replace the capacitor together with the printed circuit
board.
<Criteria of external inspection>
No liquid leak
Proper setting of safety valve
Measurement of electrostatic capacity and insulation resistance
Aim of replacement time of each component part can be fixed by checking operation hours
of the inverter. For the replacement of parts, contact Toshiba branch office printed on the
back cover of this manual. (Operation hours can be known by alarm output, if it is set.)
Standard period of years to replace main component parts
If the inverter is used under the standard operating conditions (ambient temperature: 30 on
average, load factor: 80 % or less, 12-hours operation a day), standard period of years to
replace main component parts is as shown below. The following period does not indicate the
estimated end of service life of the part but indicates the period that failure rate of the part
becomes sharply high thenceforth.
Part name
Standard period
for replacement
Replacement method, others
Cooling fan 2 to 3 years Replace with new one.
Main circuit capacitor 5 years
Replace with new one (depending on
inspection result).
Contactor, Relay, etc. Depending on inspection result
Timer Depending on operation hours
Fuse 10 years Replace with new one.
Aluminum electrolytic capacitor
on printed circuit board
5 years
Change together with printed circuit
board for new board (depending on
inspection result).
Note: Service life of part differs depending on operating environment.