Sewage treatment plant underwater agitator (submersible agitator) may encounter a variety of common faults during operation. Here are some common failures and their brief descriptions:

First, the device startup problem

1. The device cannot be started

- Cause: The thermal switch is faulty, the stator temperature is too high, the power supply is not connected, or the fuse is blown.

- Solution: Check the thermal switch, stator temperature and power supply, reset the overload protection if necessary, check the impeller rotation flexibility, etc.

Second, electrical failure

1. The device cannot accept voltage

- Cause: The power switch is not turned on, overload protection is reset, the motor cable is broken, the starting device has no control voltage or the fuse is damaged.

- Solution: Check the power switch, cable, starting device and fuse to ensure that all components are properly connected and the voltage is stable.

2. The control device is faulty

- Cause: The control switch is not connected in place, the connector is damaged, the relay and contactor coil status is abnormal, etc.

- Solution: Check the connection of the control switch, replace the damaged connector, check the status of the relay and contactor coil.

Third, overload protection failure

- Cause: overload protection device damage, contactor connector status is not good, control circuit voltage and coil rated voltage does not match.

- Solution: Replace the overload protection device, check the contactor connector status, adjust the control circuit voltage to ensure that it is proportional to the rated voltage of the coil.

Fourth, mechanical failure

1. The mixer is stuck or the speed is reduced

- Cause: silt is too dense, stirrer damage, transmission system failure, etc.

- Solution: Clean up the mud, replace the damaged stirrer or transmission parts, and ensure the normal operation of the transmission system.

2. The impeller is blocked

- Cause: the impeller is blocked by foreign matter or the size assembly is incorrect.

- Solution: Clean the impeller after cutting off the power supply, check and adjust the size of the impeller to ensure correct assembly.

Fifth, noise and vibration

- Loud noise.

- Cause: bearing damage or excessive wear.

- Solution: Replace the bearing or lubricate the bearing.

Sixth, leakage problem

- Leakage phenomenon

- Cause: The seal is aged or damaged.

- Solution: Replace the seal or repair it to ensure good sealing performance.

Seventh, motor damage

- Cause: The power supply voltage is too high or too low, and the internal parts of the motor are damaged.

- Solution: Check whether the power supply voltage is normal, and replace the internal parts of the motor if necessary.

Eighth, other failures

- The device cannot accept full voltage on three phases

- Solution: Notify the electrician to check the fuse or other electrical parts that may cause the fault.

Maintenance and maintenance advice

In order to reduce the occurrence of failures, regular maintenance and maintenance of the submersible mixer is very important. This includes cleaning the transmission parts and attachments of the mixer, checking and replacing lubricating oil, checking whether the electrical parts and the overall structure are firm, etc. Through regular maintenance and maintenance, the service life of the mixer can be extended and the efficiency of sewage treatment can be improved.

Please note that the above information is based on general experience and common situations. The specific cause and solution of the fault may vary depending on the device model, operating environment, and operation mode. In actual operation, it should be judged and dealt with according to the specific situation.