Common Faults and Troubleshooting Methods of Submersible Sewage Pumps


Published:

Feb 23,2024

The following is a summary of common faults and troubleshooting methods for submersible sewage pumps.

Common Faults and Troubleshooting Methods of Submersible Sewage Pumps

The following is a summary of common faults and troubleshooting methods for submersible sewage pumps.

Fault phenomenon:1.Insufficient flow or no water coming out

Possible reasons: 1. Reverse rotation of the motor 2. Blockage of the flow channel 3. The concentration of the pumped medium is too high 4. The lift of the device is too high, or the lift of the selected pump is much lower than the actual need 5. The impeller is severely worn 6. The liquid level is too low , causing the pump to suck in air 7. The check valve is installed in the opposite direction.

Troubleshooting methods: 1. Correct the motor steering 2. Remove debris. It is best to set up a filter around the pump (but do not install a filter at the pump inlet) 3. Use water to dilute the medium to reduce the concentration 4. Try to reduce the lift of the device (such as changing to a larger one) diameter pipe or smooth pipe, reduce the number of elbows, or increase the arc radius of the elbows), or switch to a higher lift pump 5. Replace the impeller 6. Adjust the position of the float switch so that the minimum liquid level conforms to the installation dimension diagram Requirements 7. Correct the direction of the check valve

Fault phenomenon: 2. Unable to start

Possible reasons: 1. Phase loss 2. Impeller stuck 3. Winding joint or cable disconnection 4. Stator winding burned out 5. Control electrical appliance failure

Troubleshooting method: 1. Check the circuit to eliminate the problem of phase loss. 2. Remove debris. It is best to set up a filter around the pump (but do not install a filter at the pump inlet). 3. Use an ohmmeter to check and then repair. 4. Repair and replace. Winding or stator 5. Check the control cabinet, repair or replace electrical parts. After repairing the motor, it must be inspected before use.

Fault phenomenon: 3. Stator burned out

Possible reasons: 1. Phase loss 2. Impeller stuck 3. Winding joint or cable disconnection 4. Stator winding burned out 5. Control electrical appliance failure

Troubleshooting methods: 1. Configure protective control appliances and: check the circuit and eliminate the phase failure; remove dirt, tighten the impeller fastening screws and stainless steel spring washers; dilute the medium with water; flush and clear the cooling system 2. Replace the mechanical seal or " O”-shaped sealing ring 3. Tighten all fasteners

Fault phenomenon: 4. Excessive current

Possible reasons: 1. Pipes and impellers are blocked 2. The density or viscosity of the pumped liquid is high 3. The lift of the selected pump greatly exceeds the actual need, or the use conditions change and the lift of the device is greatly reduced, causing the pump to operate beyond the recommended flow rate

Troubleshooting methods: 1. Clean the blockages in the pipes and impellers 2. Change the density or viscosity of the pumped liquid 3. Close the outlet valve, reduce the flow, or reduce the impeller, or replace the pump with a lower lift

Keyword:

Submersible Sewage Pump