SYBH Fully Automatic Variable Frequency Constant-Pressure Water Supply System

I. Product Overview

The SYBH series fully automatic variable-frequency constant-pressure water supply system is a new generation of intelligent water supply equipment developed by Shanghai Shenyin Pump Industry Co., Ltd. It integrates advanced variable-frequency speed regulation, microcomputer control, and automation technologies. By monitoring pipeline network pressure in real-time, the system automatically adjusts the operating frequency and the number of active pumps to maintain constant supply pressure, ensuring high operational efficiency, energy savings, safety, reliability, and unattended operation.

The system automatically starts and stops pumps based on actual water demand—lowering the operating frequency during off-peak periods and increasing the number of active pumps during peak periods. This effectively avoids issues common to traditional water supply methods, such as significant pressure fluctuations, high energy consumption, and severe water hammer effects.

This product is widely used in residential complexes, high-rise buildings, hotels, hospitals, schools, industrial and mining enterprises, municipal water supply systems, and industrial circulating water systems.

II. Product Features

Constant-Pressure Water Supply

Uses pressure sensors to monitor pipeline pressure in real-time and automatically adjusts the variable-frequency drive (VFD) output frequency via a PLC or dedicated controller to ensure stable supply pressure.

Features include stable pressure, continuous supply, automatic adjustment, and rapid response.

Reduces Operational Energy Consumption

Automatically adjusts pump speed based on actual water consumption.

Effectively lowers energy consumption compared to traditional constant-speed (mains frequency) water supply methods.

Actual energy savings depend on site conditions, control strategies, and usage parameters.

Fully Automatic, Unattended Operation

The system automatically performs the following functions:

Automatic pump start/stop, automatic switching of active pumps, automatic switchover to standby pumps upon failure, and automatic rotation of pump operation—eliminating the need for dedicated personnel on-site.

Intelligent Multi-Pump Control

Supports single-pump supply, dual-pump rotation, three-pump coordinated operation, and multi-pump cyclic operation; pumps are automatically engaged or disengaged based on actual flow demand.

Comprehensive Protection Functions

Includes protection against phase loss, overcurrent, overload, overvoltage, undervoltage, water shortage, and overpressure, as well as pump fault alarms, ensuring long-term stable operation.

Reliable Operation

Utilizes high-quality variable-frequency drives, electrical components, and control systems.

Offers advantages such as smooth starting, absence of water hammer impact, reduced motor wear, and extended service life. Intelligent Remote Monitoring (Optional)

Configurable based on customer requirements: PLC control system, color touchscreen, RS485 communication, Modbus communication, IoT cloud platform, and mobile app remote monitoring to enable remote equipment management.

III. Product Components

The SYBH series fully automatic variable-frequency constant-pressure water supply equipment typically consists of the following components:

· Water pump unit

· Variable-frequency control cabinet

· Pressure sensor

· Pressure tank

· Piping system

· Valve system

· Electrical control system

· Automatic protection system

IV. Working Principle

The equipment monitors the water supply network pressure in real-time via a pressure sensor.

The control system automatically adjusts the variable-frequency drive (VFD) output frequency based on pressure fluctuations to regulate pump speed.

When water demand increases: Pump speed increases or the number of operating pumps increases automatically.

When water demand decreases: Pump speed decreases or the number of operating pumps decreases automatically.

Maintains constant network pressure, achieving energy-efficient water supply.

V. Application Areas

Widely used in: water supply for high-rise buildings, residential complexes, hotels, hospitals, schools, and industrial production; agricultural irrigation; municipal water supply projects; industrial circulating water systems; and as a component of non-negative pressure water supply systems.