INVT RBU100H, Руководство по эксплуатации, Страница: 28 / 33

RBU100H operation manual 8 Maintenance and hardware diagnostics
-26-
Checking Item Method Criterion
according to
the
maintenance
information
Ventilating
duct
Ensure whether there is stuff or
foreign objection in the cooling fan,
air vent.
Visual
examination
NA
Consult the local INVT Service representative for more details on the maintenance. Visit the official
website of INVT: www.invt.com and choose Support > Services .
8.2 Cooling fan
The RBU
’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.
Fan failure can be predicted by the increasing noise from the fan bearings. If the RBU is operated in a
critical part of a process, fan replacement is recommended once these symptoms appear.
Replacement fans are available from INVT.
8.2.1 Replacing the cooling fan

Read and follow the instructions in chapter 1 Safety precautions. Ignoring the
instructions would cause physical injury or death, or damage to the
equipment.
1. Stop and disconnect the power supply and wait for at least the time designated on the RBU.
2. Lever the fan holder off the drive frame with a screwdriver and lift the hinged fan holder slightly
upward from its front edge.
3. Free the fan cable from the clip.
4. Disconnect the fan cable.
5. Remove the fan holder from the hinges.
6. Install the new fan holder including the fan in reverse order.
7. Restore power.
8.3 Capacitors
8.3.1 Reforming the capacitors
The DC bus capacitors must be reformed according to the operation instruction if the RBU has been
stored for a long time. The storing time is counted form the producing date other than the delivery
data which has been marked in the serial number of the RBU.