Analysis of the reasons for centrifugal fan tripping due to overload
Thread Content
This post was last edited by Han Yan427 on 2019-2-22 09:43. What are the reasons for the centrifugal fan to shut down due to overload during operation? Help. Rule out electrical and equipment failures. What are the process-related reasons? For example, changes in the opening degree of the valves on the inlet and outlet pipelines, as well as pressure changes, can cause an overload-induced shutdown?
For this question, it would be best to share the phenomena you have encountered so that they can be discussed. If we’re talking about what they are,,, It might be an exam question; it would be best to share the answer so that a justification can be provided. Try to answer for reference only. 1. In terms of electrical aspects: electricity, power grid failures ； 2. Mechanical issues include: damaged bearing shells, installation problems ； 3. In terms of process-related issues: overpressure and excessive flow rates caused by improper operation; leaks in the intercooler that go unnoticed in a timely manner; failures in the lubrication system that result in a lack of lubricant supply; problems with the quality of the oil; issues with oil temperature and pressure control; surge occurrences in the unit; and sudden closure of valves in the delivery system.
First, observe the motor current together with the electrical maintenance technician to determine the starting current, operating current, and trip current values. If it trips before reaching the rated current, the electrical technician can handle the fault. If it trips due to an excess of the rated current, it means the machine is consuming a large amount of power; in such cases, it is necessary to disconnect the coupling between the motor and the fan, check the motor’s no-load current, and record that value. Check for scaling on the fan blades and their condition; remove any debris that may be present, ensuring that the blades are not deformed and that there is no friction between them and the casing.
First, observe the motor current together with the electrical maintenance technician to determine the starting current, operating current, and trip current values. If it trips before reaching the rated current, the electrical technician can handle the fault. If it trips due to an excess of the rated current, it means the machine is consuming a large amount of power; in such cases, it is necessary to disconnect the coupling between the motor and the fan, check the motor’s no-load current, and record that value. Check for scaling on the fan blades and their condition; remove any debris that may be present, ensuring that the blades are not deformed and that there is no friction between them and the casing.
Processes, machinery, instrumentation, electrical – anything is possible!
First, check for any overload conditions; if none are present, then consider whether there are issues with the electrical control components. For the mechanical parts, look at the possibility of friction problems, and also check whether any adjustments were made during the manufacturing process.
1 Is there anything blocking the impeller?； 2 bearings damaged and seized ； 3 Keep the outlet fully open at the start-up stage.
Personally, if this situation occurs, I would start by ruling out electrical issues: check the motor insulation, wiring, electrical cabinets, etc.; have a specialist in electrical systems conduct an inspection. From a mechanical perspective, check the tightness of the components by turning the shaft manually and listen for any abnormal noises. In terms of operation, consider whether the air intake volume is too high, causing overload. Regarding the design, verify whether the operating conditions match those specified in the data sheet. Also, think about whether any modifications have been made previously, such as changes to the impeller, or whether an inverter has been added (whose impact is relatively minor). These are just my personal opinions; please point out any errors, thank you.
Rule out electrical and equipment failures. What are the process-related reasons? For example, changes in the opening degree of the valves on the inlet and outlet pipelines, as well as pressure changes, can cause an overload-induced shutdown?
Rule out electrical and equipment failures. What are the process-related reasons? For example, changes in the opening degree of the valves on the inlet and outlet pipelines, as well as pressure changes, can cause an overload-induced shutdown?
Rule out electrical and equipment failures. What are the process-related reasons? For example, changes in the opening degree of the valves on the inlet and outlet pipelines, as well as pressure changes, can cause an overload-induced shutdown?