Constant pressure water supply control cabinet

1. Introduction
This fully automatic system integrates technologies of frequency conversion, PLC, PID control and pressure sensor, to make a whole automatic closed-loop control system.
Through the  highly sensitive pressure sensors installed in the water supply network to test the water pressure change during the different water consumption, it can intelligently judge and compare the pressure with preset pressure, then continuously transmit the signal to the control cabinet to adjust the frequency.
The controller will then automatically change the frequency to adjust the pump motor speed and running pump number, thus to adjust water consumption and ensure constant pressure in water supply network.
2.Function
（1）Function comparison table for different models 

Item	Function	A model	B model	C model	Remarks
1	Automatic control	yes	yes	yes
2	Manual control	yes	yes	yes
3	Water level protection	yes	yes	yes
4	Automatic reset	yes	yes	yes
5	Fault shield	yes	yes	yes
6	Auto protection	yes	yes	yes
7	Phase-sequence protection	yes	yes	yes
8	Pressure sensor	yes	yes
9	Imported frequency converter	yes	yes
10	Chinese frequency converter			yes
11	PLC	yes
12	PID controller	yes	yes
13	Chinese low-voltage apparatus		yes	yes
14	Imported low-voltage apparatus	yes

（2）Function description
1, Two working modes:
 1） Automatic control mode：
It is applied for normal water supply condition to ensure constant pressure water supply.In this mode, we can easily monitor all parameters through touch screen and set corresponding parameters according to actual water supply demand
2）Manual control mode ：
It is applied for emergency when there is error in adjustment and automatic function.
2, All our main components applied are of superior quality to ensure very high reliability and anti-interference performance.
3, Water level protection：When water level is lower than preset data, the system will shut down automatically. The liquid level controller is the best with top stability.
4, Automatic reset functions: The system will start automatically after power recovery or water-level recovery.
5, Disfunctional pump shield: When there is a disfunctional pump, the system will cut off the connection between control cabinet and pump. In that case, standby pump will replace it to realize constant pressure water supply and you can maintain broken pump meanwhile.
6, Complete Automatic protection: The system has auto protection for over load, over current, short circuit, phase loss, over &low pressure in water supply network and auto shutdown when lack of water.
7, Equipment power supply phase-sequence protection: To make sure that there is no affects towards pump veer when there is power change or temporary power changed to ordinary power.
                                      

                                                                          Constant water supply system chart

3. Prodcut advantages:
1, Perfect speed adjustment: Three speed control mode: V/F constant torque control，no PG vector control（SVC）control， PG vector control（SVC）control.
2, Remarkable power saving: Customized control system for various equipment with different properties, power saving upto 10-60%.
3, Built-in simple PLC：simple PLC function refers to a Multistage speed generator. The converter can control motor running according to preset running time, frequency and direction
4, Built-in PID：It can realize closed-loop control for constant pressure water and air supply.
5, Built-in pendulum frequency function：This function is very suitable for textile and chemical fiber industry and other industry that requires traverse and Winding function.
6, Complete protection:
It has protection for over current, over voltage, under voltage, over heating, over load.
Unique modular design and reliable product structure.
All components applied are of the best quality to assure long lifespan.
Before delivery, every converter has been strictly inspected and tested, to ensure 100% quality and stability.
7, Two years of warranty.