SOLUTION

Constant Pressure Water Supply
Kinda VFD applied in constant water supply system (PID control)


1, Load feature
   (1) PID function is required.

   (2) There is a pressure sensor in the system.
   (3) In theory, if the running frequency is H1, then

        Energy Saving = 1-(H1/50)3
.
2,  Requests for frequency inverters (VFD)
   (1) Soft start the motor, reduce the surge current.

   (2) PID control should be stable and accurate.

.
3,  Typical wiring diagram


 
4,  Parameters setting list

No.Function codesDefaultSetting valueExplanation
1F0-0201Start / stop by external signal (If necessary)
2F0-0318PID control
3F9-0000PID target value set by F9-01
4F9-0150%--Set suitable value depend on system
5F9-0200, 1, 2Pressure feedback channel (AI1, AI2 or AI3)
6F9-082.00Hz0.00Cutoff frequency of PID reverse
7F8-48 ~ F8-52----Set suitable dormancy and wake up parameters.


5,  Notices
   (1) select a suitable pressure sensor, the calculation of F9-01 as below
        if the pressure sensor measure range is 16bar (1.6Mpa), and the
        target pressure is 5bar (0.5Mpa), then F9-01=5/16*100%=31.3%.

   (2) Maintenance regularly, pay attention to dust and humidity prevention.


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