MITSUBISHI ELECTRIC FR-S520 - Manual (Page 163)

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.3.7 Replacement of parts
The inverter consists of many electronic parts such as semiconductor devices.
The following parts may deteriorate with age because of their structural or physical
characteristics, leading to reduced performance and/or failure of the inverter. For
preventive maintenance, the parts must be changed periodically.
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
CAUTION
For parts replacement, consult the nearest Mitsubishi FA Center.
(1) Cooling fan
The cooling fan used to cool heat-generating parts such as the main circuit
semiconductors has a bearing whose life is said to be 10,000 to 35,000 hours. Hence,
the cooling fan must be changed every 2 to 3 years if the inverter is run continuously.
When unusual noise and/or vibration is noticed during inspection, the cooling fan must
be changed immediately.
Inverter Model No. Fan Type
FR-S520-1.5K, 2.2K, 3.7K
FR-S520S-1.5K
MMF-06D24DS BKO-C2416H07
FR-S540-1.5K, 2.2K, 3.7K MMF-06D24ES-FC4 BKO-CA1027H09