Hitachi SJ300 - Manual (Page 34)

5- 5
5.6 Parts replacement
Inverter is consists from many electrical components. And inverter cannot work properly unless all of them
works normal. Electrical components in following table are the components which may degrade according
to the usage period.
HITACHI recommend to replace those electrical components periodically to avoid any expected failure caused by them.
Parts name Recommended
period for
replacement
Remarks
Cooling fan 2 ~ 3 years Replace with fresh one.
DC bus capacitors 5 years Replace with fresh one. (Decide after inspection.)
Electrolytic capacitors
on PCB 5 years Replace with fresh one. (Decide after inspection.)
Relays - Inspection in advance
(1) Cooling fan
Lifetime of the cooling fan depends on the usage condition, however it is normally around 35,000 hours.
That means it is recommended to replace the cooling fan every 2 ~ 3 years in case the inverter operates
continuously. Of course it should be replaced immediately in case the abnormality is found.
(How to remove cooling fan for mold case)
• Remove terminal cover and front cover .
‚ Reconfirm that the charge lamp is turned OFF.
ƒ Push both side of the cooling fan holder plate and pull out like following figure.
„ Remove the connector for fan connection.
(How to fix cooling fan for mold case)
• Pay attention to the direction of the cooling fan.
‚ Connect the fan connector to J21
or J22 (depends on the model) on the power PCB.
ƒ Fix the cooling fan holder board to the inverter main body.
„ Fix the front cover and terminal cover.
•
ƒ
Label side of
cooling fan