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Checking part
Resistors
Transformers and
reactors
Electromagnetism
contactors and
relays
Control
PCB and plugs
circuit
Cooling fan
Cooling
system
Ventilating duct
8.8.2 Cooling fan
The inverter's cooling fans have a minimum life span of 25,000 operating hours. The actual life span depends
on the inverter usage and ambient temperature.
The operating hours can be found through P07.14 (accumulative hours of the inverter).
Fan failure can be predicted by the increasing noise from the fan bearings. If the inverter is operated in a
critical part of a process, fan replacement is recommended once these symptoms appear. Replacement fans
are available from SALICRU.
Fault Tracking
Checking item
Ensure whether there is
replacement and splitting caused
by overheating.
Ensure that there is not offline.
Ensure there is no abnormal
vibration, noise and smelling,
Ensure whether there is no
vibration noise in the workrooms.
Ensure the contactor is good
enough.
Ensure there are no loose screws
and contactors.
Ensure there is no smelling and
color-changing.
Ensure there are no cracks,
damage distortion and rust.
Ensure there is no weeping and
distortion to the capacitors.
Estimate whether there is
abnormal noise and vibration.
Estimate there is no losses screw. Tighten up
Ensure there is no color-changing
caused by overheating.
Ensure whether there is stuff or
foreign objects in the cooling fan,
air vent
Checking method
instruments.
the original value
*0.85.
Smelling and visual
NA
examination
Visual examination
The resistors are in
or measure with
±10% of the
multimeter
standard value.
Hearing, smelling
and visual
NA
examination
Hearing
NA
Visual examination NA
Fasten up
NA
Smelling and visual
NA
examination
Visual examination NA
Visual examination
or estimate the
usage time
NA
according to the
maintenance
information
Hearing and Visual
examination or
Stable rotation
rotate with hand
NA
Visual examination
or estimate the
usage time
NA
according to the
maintenance
information
Visual examination NA
Criterion
105 - 144
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