LS500 universal Frequency Converter Application on constant pressure water supply

First, the industry entrance

Applications water supply industry is extremely wide, road watering, the direction of domestic water supply, industrial water supply, water supply and other construction sites can be used LS500 universal Frequency converter control. LS500 general Frequency converter more uniform water programs, is easy to maintain.

Second, the composition of the water supply equipment industry and how it works

Water Supply mainly by a motor, a pump, a buffer tank, a remote pressure gauge, a common LS500 Frequency converter composition. Terminal start-stop is generally used. Water Supply System by remote gauge feedback signal is compared with a given value, when the feedback value exceeds the sleep threshold, sleep time over the inlet, Frequency converter into hibernation. When the feedback threshold is lower than the start threshold, the motor is restarted. The pressure was maintained near the setpoint.

To achieve constant pressure water supply main function is to maintain a constant water pressure, no major fluctuations occur.

The main functions to be achieved:

(A) a given pressure, that is, the number of kilograms given.

(Ii) achieve sleeping, when not in the water, the motor is maintained at a low speed or zero speed.

(C) when the pressure falls below a certain value when the feedback needs to be restarted to maintain the pressure.

Four, AC300 used in the Water Supply industry.

plan:

1, F00.03 = 8 (given channel frequency is set to: PID control given).

2, the PID controller set reference source: (example: 10 kg tank to a constant pressure of 6 kg; the given set of 6/10 + F11.32 (if F11.32 case 5%) = 65%; 6 kg at a constant pressure if need be exact, the deviation is small wake, can be disposed directly given 6/10 = 60%).

3, the PID controller feedback signal source is provided; (voltage or current pressure gauge pressure gauge, etc.).

4, F11.29 = 1; (Water Supply effective sleep).

5, the root frequency field provided F11.30 sleep; (output frequency is below the frequency of sleep after going to sleep F11.31).

6, the root of the scene is set F11.31 sleep latency

7, set F11.32 wake deviation; (PID given when - Wake-up deviation> PID feedback, will stop dormant, will start).

8, wake-up delay is provided; (PID given as - Wake-up deviation> PID feedback, set time after wake-up delay, no longer dormant, Frequency converter starts)

V. Conclusion

The use of constant pressure water supply is Frequency converter PID control function, the control performance is more perfect, because I am the Secretary General LS500 Frequency converter optimizing PID control algorithm, making PID control performance, high precision, dynamic fast response, thereby enabling good process control, process control to ensure the reliability.