AC300 frequency inverter in water supply industry in India

프로젝트 개요

Site: Water supply industry
Date: November 2020
Location: India
Industry: Water supply
Project scope: To develop a new series of solar pumps with the help of VEICHI solar pump drives
VEICHI deliveries: Solar PV module array, AC300 solar pump drive, a motor

Project Introduction

With the development of frequency converter speed control technology and the continuous improvement of people's requirements for the quality of drinking water, frequency inverter water supply equipment has been widely used in multi-story residential communities and high-rise buildings. The frequency conversion speed control water supply has the following advantages:

1. Less investment in equipment and reliable system operation.
2. Small footprint, saving electricity and water.
3. he high degree of automation, convenient operation and control, etc.

The application range of the water supply industry is extremely wide. The directions of road administration, household water supply, industrial water supply, and construction site water supply can all be controlled by Frequency converters. The quality of the water supply frequency converter is uneven so that our AC300 has a good entry point, the water supply scheme is more unified, and the maintenance is more convenient.

The challenge:

1. Constant pressure water supply is mainly composed of a motor, a water pump, a buffer tank, a remote pressure gauge, and an AC300 inverter. Generally use terminals to start and stop.
2. The constant pressure water supply system compares the feedback signal with the given value through the remote pressure gauge. When the feedback value is higher than the sleep threshold, after the sleep time, the inverter enters the sleep state. When the feedback threshold is lower than the start threshold, the motor restarts to keep the pressure near the given value.

The solution:

1. The water pump starts and stops softly, without impact and overpressure hazards, and water hammer.
2. Reliable operation: the frequency converter realizes the soft start of the pump to prevent the impact of the pipe network, avoid the pipe network pressure exceeding the limit, and the pipeline rupture.
3. The equipment has a high degree of automation, the water supply is stable and reliable, and the water quality has no secondary pollution.
4. Perfect protection function: When a single pump fails, it will actively send out an alarm message and start the standby pump at the same time to maintain the water supply balance.

Project Products:

Water pump unit

Characteristics of a constant pressure water supply system

1. The water pump starts and stops softly, without impact and overpressure hazards, and water hammer.
2. Reliable operation: the frequency converter realizes the soft start of the pump to prevent the impact of the pipe network, avoid the pipe network pressure exceeding the limit, and the pipeline rupture.
3. The equipment has a high degree of automation, the water supply is stable and reliable, and the water quality has no secondary pollution.
4. Perfect protection function: When a single pump fails, it will actively send out an alarm message and start the standby pump at the same time to maintain the water supply balance.

Functions to be realized in the constant pressure water supply industry

The main function of a constant pressure water supply is to keep the water pressure constant without major fluctuations.

Main functions to be realized:

1. The pressure setting is the kilogram setting.
2. The pressure setting is the kilogram setting.Realize the sleep function, when the water is not used, the motor maintains a low speed or zero speed.
3. When the pressure feedback is lower than a certain value, it needs to restart to maintain the pressure.

AC300 is used in the constant pressure water supply industry

Parameter settings:

Program:

1. F00.03=8（The frequency setting channel is set as PID control setting).
2. Set the given signal source of the PID controller; (for example a 10kg water tank needs a constant pressure of 6kg; then the given setting is 6/10+F11.32 (if F11.32 is 5% at this time) =65%; If the constant pressure does not need to be too accurate at 6 kg and the wake-up deviation is small, the setting can be directly set 6/10=60%).
3. Set the PID controller feedback signal source; (voltage pressure gauge or current pressure gauge, etc.).
4. F11.29=1; (constant pressure water supply sleep is valid)
5. Set F11.30 sleep frequency at the root site; (the output frequency is lower than the sleep frequency and enters sleep after F11.31).
6. Set F11.31 sleep delay according to the scene.
7. Set F11.32 wake-up deviation; (when PID gave—wake-up deviation>PID feedback, it will stop sleeping and start).
8. Set wake-up delay; (when PID gave—wake-up deviation>PID feedback, after the time set by wake-up delay, the inverter will no longer sleep and the inverter will start).

Conclusion

Constant pressure water supply uses inverter PID control function. Previously, constant pressure water supply mainly used AC60 and AC70 inverters to achieve the requirements of constant pressure water supply, but the use of AC300 inverters has more perfect control performance on constant pressure water supply. Because our company has optimized the PID control algorithm on the AC300 general-purpose inverter, the PID control performance is good, the precision is high, and the dynamic response is fast, to achieve excellent process control and ensure the reliability of process control.