Troubleshooting Centrifugal Fan Tripping Issues

In centrifugal fan operation, tripping is primarily caused by various environmental factors: relatively short dust collection pipes, closed valves (but butterfly valves cannot be fully shut), or insufficient system resistance leading to motor tripping.

Tripping also occurs when pipelines are excessively long, valves remain open, yet resistance still exceeds the fan's tolerance threshold; electrical faults causing fan tripping; mechanical causes such as incomplete opening of the fan air brake triggering tripping; oversized fan outlet duct cross-sections resulting in excessive shaft power, motor overload, and current exceeding limits; Low resistance in the dust collector and ductwork.

Solutions: Reduce the opening of the air valve at the centrifugal fan outlet to lower shaft power. If the air valve fails to meet system requirements after adjustment, consider replacing the fan. Under normal conditions, the fan should start with the damper closed, meaning the fan will not be loaded when the damper is closed (typically rare).

Replace the centrifugal fan motor. If it is a multi-wing fan-shaped air conditioning damper (where the damper rotates left or right), incorrect damper direction causes lower current as the damper opens further. Inspect for excessive dust in the concentricity (D-type), bearings, and impeller.