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3.2.3 Replacement of parts
The high power factor converter consists of many electronic parts such as semiconductor devices.
The following parts may deteriorate with age because of their structures or physical characteristics, leading
to reduced performance or failure of the high power factor converter. For preventive maintenance, the parts
must be changed periodically.
See the following table for the high power factor converter parts replacement guide. Lamps and other short-
life parts must also be changed during periodic inspection.
Replacement Parts of the High Power Factor Converter
Note:For part replacement, contact the nearest Mitsubishi FA center.
(1) Cooling fan
The cooling fan cools heat-generating parts such as the main circuit semiconductor devices. The life of
the cooling fan bearing is usually 10,000 to 35,000 hours. Hence, the cooling fan must be changed every
2 to 3 years if the high power factor converter is run continuously. When unusual noise and/or vibration is
noticed during inspection, the cooling fan must be changed immediately.
(2) Smoothing capacitors
A large-capacity aluminum electrolytic capacitor is used for smoothing the DC in the main circuit, and an
aluminum electrolytic capacitor is also used for stabilizing the control power in the control circuit. Their
characteristics are adversely affected by ripple current, etc. When the high power factor converter is
operated in ordinary, air-conditioned environment, change the capacitors about every 5 years.
When 5 years have elapsed, the capacitors will deteriorate more rapidly. Check the capacitors at least
every year (less than six months if the life will be expired soon).
Check the following:
1) Case (side faces and bottom face for expansion)
2) Sealing plate (for remarkable warp and extreme crack)
3) Explosion-proof valve (for excessive valve expansion and operation)
4) Appearance, external crack, discoloration, leakage.
When the measured capacitance of the capacitor has reduced below 85% of the rating, change the
capacitor. For capacitance measurement, it is recommended to use a handy device available on the
market.
(3) Relays
To prevent a contact fault, etc., relays must be changed according to the number of accumulative
switching times (switching life).
Part Name
Standard Replacement
Interval
Description
Cooling fan 2 to 3 years Change (as required)
Smoothing capacitor in
main circuit
5 years Change (as required)
Smoothing capacitor on
control board
5 years Change the board (as required).
Relays – Change as required.