How to solve the problem of no feedback signal on the flow controller switch

Source:Shanghai Automation Instrumentation Co., Ltd    Date:2024-08-13

Background of the problem

Problem description: The flow controller switch does not provide feedback signal to turn on.

A flow controller is a device used to control water flow. Once the controller malfunctions, it can seriously affect the normal use of water flow. If there is a problem with the flow controller switch not providing

feedback signal, it must be resolved in a timely manner.

Reason for the problem

1.Wiring problem: If the wiring is incorrect, such as inconsistent with the wiring definition requirements for power supply, control feedback signal, control ground, etc., it will cause the flow controller to not work

properly. ‌

2.Pressure issues: Inconsistencies between the air distribution and outlet pressure and the pressure range at

the time of ordering, or the presence of non moving states such as water in the pipeline, can affect the

normal operation of the flow controller. ‌

3.Pipeline issues: Blockage or bending of the air distribution pipeline, as well as fluid vibration and secondary flow in the pipeline, and the presence of a small amount of air, can all affect the accurate control of flow

rate. ‌

4.Gas problem: The use of gas is not dry and clean, and contains impurities such as oil and gas that are

prone to pollution, which can affect the performance of the flow controller. ‌

5.Control signal issue: The control feedback signal does not meet the product's usage range. If the analog

control signal is set to 0 when turned off, failure to meet this condition will cause the controller to

malfunction. ‌

In addition, there are other factors that may cause the flow controller to malfunction, such as fluid vibration and secondary flow in the pipeline, excessive dead zone of micro switches leading to inability to achieve

lower limit alarm, and low flow rate causing sensor force to be small and unable to operate

Solution method

1. Debugging the switch: First check if the switch is stuck, loose, or not. If the component is loose, a wrench can be used to secure the switch tightly; If it is a switch malfunction, the switch components need to be

replaced.

2. Replace switch: If it is determined that the switch is faulty, the switch components need to be replaced

immediately. When replacing, pay attention to selecting the right model to avoid other problems.

3. Check the wiring: If the switch itself is not faulty, it is necessary to check whether the wiring has poor

contact, incorrect cable insertion, etc. The cables can be replaced to eliminate these issues.

4. Solve the control terminal fault: If none of the above methods can solve the problem, it is necessary to

check whether there is a fault in the control terminal. You can check the power supply, communication ports, programs, etc. to solve the problem.

Precautions

Before replacing the switch components, it is necessary to turn off the power.

When replacing switch components, it is necessary to strictly follow the specifications to avoid accidental

damage caused by misoperation.

When checking cables, be careful to avoid dangers such as short circuits.

Summary

This article introduces the reasons and solutions for the failure of the flow controller switch to provide

feedback signals. If you encounter such problems, you can refer to this article for solutions. At the same

time, when using a flow controller, it is also important to pay attention to regular maintenance to extend the lifespan of the equipment and avoid problems.