Introduction: A New Approach to Intelligent Pump Station Management
As cities develop and industrial facilities expand, wastewater collection and drainage infrastructure must operate with greater reliability and efficiency.
Prefabricated pumping stations are increasingly used in residential communities, commercial developments, industrial parks, and municipal drainage networks. Although these facilities offer compact installation and flexible deployment, their operation still presents several management challenges.
Frequent manual inspections increase labor costs. Uneven pump operation can accelerate equipment wear. Meanwhile, unexpected failures or abnormal liquid levels may cause flooding, equipment damage, or environmental incidents.
A modern pump station therefore needs an automation system that can operate independently, identify abnormal conditions, coordinate multiple pumps, and provide remote access to operating information.
The Rectangular Technology N80/S80 PLC-based solution addresses these requirements through an integrated combination of domestic PLC hardware, RECT touch-screen interfaces, and cloud-based monitoring technology.
Its objective is simple: establish a safer, more efficient, and more manageable pumping station through intelligent automation.
1. From Traditional Pumping Stations to Unattended Operation
Traditional pumping station management often involves several independent activities.
Operators inspect equipment on-site, check liquid levels, record pump operating conditions, and manually respond to alarms. However, this approach becomes increasingly inefficient when multiple pumping stations are distributed across different locations.
Three problems are particularly common.
High Labor and Maintenance Costs
Frequent manual inspections require personnel to travel between facilities. This increases operating expenses and makes routine management more complicated.
Uneven Pump Wear
When pump operation follows a fixed sequence, certain units may accumulate significantly more operating hours than others. Consequently, maintenance requirements and equipment wear become uneven.
Delayed Fault Response
Without real-time communication and remote alarm notifications, equipment failures may remain unnoticed until personnel arrive at the station.
An unattended automation system helps solve these problems by combining local PLC logic with remote cloud supervision.
Importantly, unattended operation does not mean eliminating local control or safety protection. Instead, it means allowing the pumping station to perform routine operations automatically while personnel supervise its condition remotely.
2. Domestic PLC Technology for Independent and Reliable Control
The control architecture uses Rectangular Technology N80/S80 series PLCs as the core automation equipment.
The S80 domestic version is designed for projects requiring domestically sourced automation components and compliance with applicable localization requirements.
This provides an alternative for projects that prioritize domestic supply chains, information technology application innovation requirements, and local industrial control solutions.
The system also offers wide-temperature hardware options for demanding installation environments.
These options are particularly useful in pumping stations where equipment may be exposed to:
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High humidity inside underground wells.
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Outdoor temperature fluctuations.
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Low-temperature winter conditions.
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Direct sunlight and elevated cabinet temperatures.
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Electromagnetic interference from variable-frequency drives.
With appropriate electrical isolation, surge protection, grounding, and cabinet design, the control system can be configured for challenging industrial environments.
Another advantage is that the PLC, RECT touch screen, and cloud platform are developed within the same product ecosystem. This helps simplify programming coordination, system integration, technical support, and subsequent maintenance.
3. Six Key Automation Functions for Pump Station Operation
3.1 Automatic Liquid-Level Regulation
Liquid-level control determines when pumps should start, increase, decrease, or stop.
The PLC receives signals from liquid-level transmitters, ultrasonic level meters, and float switches. It then executes the corresponding control logic.
When the liquid level reaches a configured threshold, the system starts the required pump. If the inflow increases, additional units can be activated.
At high-high liquid levels, emergency pump coordination and alarm notifications can be triggered. At low levels, the PLC stops the pumps to prevent dry running.
For variable-frequency applications, PID regulation can maintain a more stable liquid level while reducing frequent motor starts and stops.
3.2 Intelligent Multi-Pump Rotation
Multi-pump stations need a balanced operating schedule.
The PLC automatically rotates pump operation according to accumulated running hours or configured scheduling rules.
This prevents a single pump from carrying most of the workload.
If a running pump develops a fault, the system can switch to an available standby unit. The faulty pump is recorded and locked out of automatic operation until the fault has been cleared and the required reset procedure completed.
3.3 Comprehensive Equipment Safety Protection
Equipment protection is essential for preventing electrical and mechanical failures.
The system can monitor motor overload, short circuits, phase loss, electrical leakage, winding temperature, VFD fault signals, and dry-running conditions.
When a protection condition occurs, the PLC executes the relevant interlock or shutdown sequence.
At the same time, local audible and visual alarms provide immediate indication, while cloud notifications allow maintenance personnel to receive fault information remotely.
3.4 Automatic Inspection and Anti-Sticking Operation
Pumps that remain inactive for long periods may develop mechanical problems, such as corrosion or component sticking.
To reduce this risk, the control program supports periodic automatic inspection.
When the water level remains low and the pump has been idle for a configured period, the PLC can briefly activate the pump according to the inspection schedule and applicable safety conditions.
This helps maintain equipment readiness and reduces the risk associated with prolonged inactivity.
3.5 Auxiliary Equipment Linkage
Modern pumping stations often contain more than pumps and motors.
The control system can also coordinate crushing screens, mixers, deodorization fans, and ventilation valves.
For example, a crushing screen can operate according to a timer or liquid-level difference. A mixer can start periodically to reduce sediment accumulation.
Deodorization and ventilation equipment can operate through configured linkage conditions.
These devices can also be independently switched for inspection, maintenance, and commissioning.
3.6 Three Operating Modes
To balance automation and maintenance flexibility, the system provides manual, automatic, and remote operating modes.
| Mode | Main Purpose |
|---|---|
| Manual | Local maintenance, inspection, and commissioning |
| Automatic | Normal operation using PLC control logic |
| Remote | Authorized remote monitoring and equipment operation |
Mode interlocks and permission management help prevent conflicting commands and unsafe equipment operation.
4. Cloud Monitoring: Managing Multiple Pump Stations from One Platform
A key feature of the solution is the PLC Cloud Manager platform.
The platform connects local PLC systems through 4G, 5G, or Ethernet networks. It provides a centralized interface for monitoring equipment across different locations.
Its main functions include:
Remote Equipment Supervision
Operators can view pump running status, liquid levels, operating conditions, and alarm information through a web browser or mobile device.
GIS-Based Station Management
Multiple pumping stations can be displayed on a geographic information map. This helps management personnel identify station locations and monitor distributed facilities more conveniently.
Alarm Push Notifications
The platform supports graded alarm notifications through WeChat, SMS, and email. Important faults can be delivered to responsible personnel without waiting for the next scheduled inspection.
Historical Data and Operating Reports
Historical liquid-level curves, pump operating hours, fault records, and energy consumption data can be stored and reviewed.
Reports can be exported to support maintenance planning, operational evaluation, and project acceptance.
Remote Operation
Authorized users can perform permitted remote operations according to the configured control strategy and security permissions.
Together, these functions help transform individual pumping stations into connected and centrally managed infrastructure assets.
5. Open Communication for Municipal and Environmental Platforms
A pumping station does not operate in isolation. It may need to exchange data with municipal drainage networks, water utility management systems, and environmental supervision platforms.
The solution supports Modbus RTU and Modbus TCP communication.
Through appropriate communication configuration, relevant operating information can be transferred to third-party supervisory platforms.
This makes the system suitable for projects that require centralized monitoring, drainage dispatch coordination, and environmental data reporting.
The architecture also supports future expansion.
For example, additional monitoring and management functions may include:
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Hydrogen sulfide gas detection.
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Video surveillance and alarm linkage.
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Access control management.
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Flow measurement and statistical analysis.
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Energy consumption monitoring.
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Additional ventilation and environmental equipment control.
The modular design makes it easier to introduce these functions without rebuilding the entire automation system.
6. Flexible Project Configuration and Engineering Delivery
Different pumping stations have different capacity requirements. Therefore, a standardized control solution should also allow flexible configuration.
The proposed system supports one to six pump configurations, with optional integration of auxiliary equipment.
A typical engineering delivery package may include:
| Project Component | Description |
|---|---|
| PLC control program | Pump sequencing, interlocks, alarms, and protection logic |
| HMI configuration | Local operation and monitoring screens |
| Electrical drawings | Control circuit and electrical schematics |
| BOM list | Electrical component specifications |
| I/O point list | Field signal and PLC interface definitions |
| Control cabinet | Optional cabinet assembly, wiring, and commissioning |
| Cloud platform | PLC Cloud Manager account and access permissions |
| Technical support | Commissioning guidance, training, and after-sales assistance |
Preconfigured standard programs can shorten engineering preparation and commissioning time. Parameters can then be adjusted according to actual site conditions.
7. Operational Benefits and Long-Term Value
The intelligent control architecture brings measurable management advantages.
Reduced Manual Inspection Requirements
Cloud monitoring and automatic alarms reduce the need for routine on-site inspections. Depending on project conditions, the solution targets a reduction of more than 70% in manual field inspection workload.
Improved Equipment Service Life
Automatic pump rotation helps distribute operating hours more evenly. In addition, standby switching reduces the impact of individual pump failures on overall station operation.
Lower Energy Consumption
Variable-frequency PID control can maintain more stable liquid levels and reduce unnecessary pump starts and stops. Actual energy savings depend on pump selection, hydraulic conditions, inflow patterns, and control parameters.
More Efficient Maintenance
Fault records, historical operating curves, and remote notifications help maintenance teams identify problems and organize repair work more efficiently.
Better Management Transparency
Centralized monitoring and automatic reporting provide traceable operational information. This supports management evaluation and relevant water utility or environmental supervision requirements.