The operating hours can be found through E07.14 (accumulative
Fan failure can be predicted by the increasing noise from the fan bearings. If
hours).
cooling fan has a minimum life span of 25
Fault Tracking
124
Checking part
Checking item
Checking
method
Criterion
Control
circuit
PCB and plugs
Ensure there are no loose
screws and contactors.
Fasten up
NA
Ensure there is no
smelling and
color-changing.
Smelling and
visual
examination
NA
Ensure there are no
crackles, damage
distortion and rust.
Visual
examination
NA
Ensure there is no
weeping and distortion to
the capacitors.
Visual
examination or
estimate the
usage time
according to the
maintenance
information
NA
Cooling
system
Cooling fan
Estimate whether there is
abnormal noise and
vibration.
Hearing and
Visual
examination or
rotate with hand
Stable rotation
Estimate there is no losses
screw.
Tighten up
NA
Ensure there is no
color-changing caused by
overheating.
Visual
examination or
estimate the
usage time
according to the
maintenance
information
NA
Ventilating duct
Ensure whether there is
stuff or foreign objection in
the cooling fan, air vent.
Visual
examination
NA
8.8.2 Cooling fan
,000 operating hours. The
actual life span
depends on the usage and ambient temperature.
is operated
in a critical part of a process, fan replacement is recommended once these symptoms appear.