Operational manual for dynamic braking unit
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official website of INVT: http://www.invt.com.cn and select Services and Support in the front
page to go to online service.
9.2 Cooling fan
The dynamic braking unit’s cooling fan has a minimum life span of 25,000 operating hours. The
actual life span depends on the usage and ambient temperature.
Fan failure can be predicted by the increasing noise from the fan bearings. If the braking unit is
operated in a critical part of a process, fan replacement is recommended once these symptoms
appear. Replacement fans are available from INVT.
9.2.1 Replacing the cooling fan
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 DBU and disconnect it from the AC power source and wait for at least the time
designated on the DBU.
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.
9.3 Power cable
Read and follow the instructions in chapter Safety Precautions.
Ignoring the instructions may cause physical injury or death, or
damage to the equipment.
1. Stop the drive and disconnect it from the power line. Wait for at least the time designated on
the braking unit.
2. Check the tightness of the power cable connections.
3. Restore power.
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