Frequency conversion pump pressure sensor common faults and solutions

One: What causes big noise, and Unsteadiness of water pressure In the course of use?

1.When pump is used by users, the water pressure fluctuates violently, and the frequency conversion pump is always in the frequency conversion state.

2.Pipe resonance cased by Water pressure fluctuation which caused by frequency conversion.

3.The frequency of the variable frequency part may be close to the mechanical vibration frequency of the pump and cause resonance.

4.Check whether there is cavitation phenomenon (pump filling water is complete) , whether there is air accumulation in the outlet pipeline.

5.Check whether the pump bearing of the non-negative pressure water supply equipment is wear.

6.The parameters of frequency conversion are not set well.

Second: the water pump start pressure is very large

1.To check whether there is a blockage in the pipeline, causing a sudden change in pressure (because the flow rate is reduced) .To check whether the pipeline occur leakage phenomenon, resulting in pressure can not be maintained.

2.Generally speaking, the water supply unit is automatic, its automatic action is depends on the pressure to control the pressure switch action, also affects by The flow rate of the pipeline ,Start with small flow will cause pressure suddenly increased at the outlet to the blocking, resulting in pressure switch error action and Frequent start-up (leakage will also) .

Third : Water can't be pumped out.

1.Check the sink to see if there is water, check if the direction of the motor rotation is correct, frequency converter may be changed.

2.If the check valve is at the front end of the motor,and there is water at the front end of the check valve, but the water in the motor is drained, then the motor is pumping air.Check whether there is a valve in front of the motor, drain the water from it, so that the motor can pump water.

3.If all the above can not be solved, open the machine to see if the pump impeller is broken.

Forth: What is the function of the pressure-stabilizing tank at the water outlet when the water inlet has a water tank?

1.Play the role of constant water pressure, but now just pump can solve the problem of constant pressure, do not need to set constant pressure tank.

2.Play the role of eliminating Water Hammer, reduce the Pipe network shock aused by Water Hammer.

Fifth: the pressure can not be stable, how to solve?

If it is a large fluctuation in water consumption, or the water supply pipe is too small, it is not easy to solve. You can try resetting the PID parameters of the system and changing the installation position of the pressure sensor.

Six: Does the position of pressure sensor installation have nothing to do with energy saving?

It doesn't matter. It just depends on the setting. If the terminal, the pressure will be lower, if the pump outlet, the pressure will be higher.

Seventh:Water pump running for a long time lead to hot water?

CAUSE:User long time with small water quantity will cause the water to be scalding.

Solution:the control will enter a dormant state when water consumption is very small, ,the original large pump will automatically stop running, and start the small pump
。