TECHTOP TD20 Series Product Manual page 89

TD20 Series VFD
Checking part
Cooling fan
Cooling
system
Ventilating
duct
6.1.1 Cooling fan
The VFD's cooling fan has a minimum life span of 25,000 operating hours. The actual life span depends
on the VFD usage and ambient temperature.
The operating hours can be found through P07.14 (accumulative hours of the VFD).
Fan failure can be predicted by the increasing noise from the fan bearings. If the VFD is operated in a
critical part of a process, fan replacement is recommended once these symptoms appear. Replacement
fans are available from TECHTOP CANADA INC..
•
Read and follow the instructions in chapter Safety Precautions. Ignoring the
instructions would cause physical injury or death, or damage to the
equipment.
1. Stop the VFD and disconnect it from the AC power source and wait for at least the time designated on
the VFD.
2. Lever the fan holder off the VFD frame with a screwdriver and lift the hinged fan holder slightly upward
from its front edge.
3. Disconnect the fan cable.
4. Remove the fan holder from the hinges.
5. Install the new fan holder including the fan in reverse order.
6. Restore power.
6.1.2 Capacitors
Reforming the capacitors
The DC bus capacitors must be reformed according to the operation instruction if the VFD has been
stored for a long time. The storing time is counted from the producing date other than the delivery data
which has been marked in the serial number of the VFD.
Checking item
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 objection in the cooling
fan, air vent.
Checking method
according to the
maintenance
information
Hearing and Visual
examination or rotate
with hand
Visual examination or
estimate the usage time
according to the
maintenance
information
Visual examination
-87-
Fault Tracking
Criterion
Stable rotation
NA
NA
NA