Electrical control requires two pumps to be equipped with each other. How to achieve this?

For example, during a shift, the pump automatically switches to another pump, and when the shift time is up, it automatically switches to the backup pump. This is also done in this way.: If one pump fails, it will automatically switch to the other pump. If there is no PLC, hardware interlocking and timer are required. If there is a PLC, mutual backup can be done as desired.

There are two pumps, and only one is turned on normally. If this pump stops, the other one will be started automatically.

It is not necessary to think of ways to control the electrical system. The poster should be referring to the ability to automatically start the backup pump when the normal working pump suddenly fails! There are many methods to choose from, but each has its own shortcomings. If you are more thoughtful, it is best to use the following method to select and install 2 to 3 pumps with flow switches, and then vote to configure the output to start the backup pump. This method ensures that the backup pump is started regardless of whether the working pump has a mechanical or electrical problem.

I agree to consider multiple aspects. Traffic is one of the conditions. This is very useful for emergency failures.

I usually just select the running status feedback chain electrically. The flow conditions are very good and it is easy to implement programmatically.

Using pressure and flow as criteria, PLC is used to complete the control.

The two pumps are backup for each other and have the following combinations: 1. There are two pumps and only one control circuit.； 2. Two control loops independently control one pump. ； Common methods for implementing control loops are as follows:: 1. Use traditional AC contactors, intermediate relays and time relay devices to realize interlocking and mutual backup control loops. 2. Use LOGO as the core controller, plus several AC contactors and intermediate relays to achieve interlocking and mutual backup. 3. Use a soft starter, plus two main AC contactors and two intermediate relays to achieve interlocking and mutual backup. 4. Use a frequency converter, plus two main AC contactors and two intermediate relays to achieve interlocking and mutual backup. 5. Use PLC as the main controller, plus two main AC contactors and two intermediate relays to achieve interlocking and mutual backup.

It depends on what system you are using now. If there is a DCS or PLC, use the pump running signal to control the start and stop of another pump. It only requires adding a relay to the pump starting circuit and a DCS DO point. If there is no monitoring system, then the flow switch is the most direct choice. A flow switch, a power signal, and a relay can be implemented. The proposal on the 8th floor is also very classic.

In fact, when two pumps control each other and switch, it is also a good way to use pressure to judge. Add a pressure discrimination at the pump outlet: 1. If the pressure is too high, the pump outlet may be blocked. Carry out alarm and stop pump processing. 2. If the pressure is too low, the current pump may be faulty, and the backup pump will be automatically switched to run. If the pressure is still too low, the pump inlet may be clogged. Call the alarm or stop the pump. This judgment is more scientific than the flow switch.

Our company's auxiliary engine oil pump is to turn on 1# to prepare 2#, or to turn on 2# to prepare 1#, or to operate a single pump manually.

Yes, I feel that using pressure to judge is more scientific than flow rate.

There are various types of pumps, such as water pumps, oil pumps, cryogenic liquid pumps, etc. Then the operating pump is first considered to be the main pump, and the other pump is the backup pump. Only in the event of main pump failure is it required to automatically start the backup pump and stop the main pump at the same time. For water pumps, oil pumps or low-temperature liquid pumps, it is first necessary to confirm that the main pump is faulty, and the fault judgment methods of different pumps are different. Therefore, the characteristics of the pump itself must be carefully studied first, and at the same time, the pump fault must be determined based on the role of the pump in the process and the overall situation, and then switching of pumps can be considered.