112 Maintenance
Fans
The cooling fan lifespan depends on the inverter usage and ambient temperature. See the
firmware manual for an actual signal which indicates the hours of usage of the fan.
Fan failure can be predicted by the increasing noise from fan bearings and the gradual rise
in the heatsink temperature in spite of heatsink cleaning. If the inverter is operated in a
critical part of a process, fan replacement is recommended once these symptoms start
appearing. Replacement fans are available from ABB. Do not use other than ABB-
specified spare parts.
Replacing the LCL filter cooling fan (R7i)
WARNING! Obey the safety instructions, page 11. If you ignore the instructions,
physical injury or death, or damage to the equipment can occur.
1. Stop the inverter and do the steps in section Precautions before electrical work on
page 12 before you start the work.
2. Open the LCL filter cubicle door.
3. Disconnect the wire plug.
4. Remove the two screws holding the fan unit.
5. Pull the fan unit out.
6. Install new fan in reverse order.
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