Wolong WD400 VFD for Water Supply Plant Applications

Water supply plants rely on pumps running under variable load conditions throughout the day, driven by fluctuating demand, pipe network pressure changes, and seasonal usage patterns. Running pumps at fixed speed leads to excessive energy consumption, pressure instability, and unnecessary mechanical wear on pump systems.

Solution: Wolong WD400 Series VFD

The Wolong WD400 series is a high-performance variable frequency drive purpose-built for demanding pump and motor control applications, including municipal and industrial water supply systems. With flexible control modes and a wide power range, the WD400 provides stable, energy-efficient operation for water pumps of virtually any size.

Key Features

1. Wide Power Range
Output power from 0.75kW up to 710kW, with three-phase voltage support of 380V–480V, suitable for water pumps of all capacities — from small booster pumps to large municipal supply pumps.

2. Flexible V/F Control Modes
Supports linear V/F, square V/F, and multi-point V/F control, allowing precise adaptation to different pump curve characteristics and load types.

3. Built-in PID Process Control
Integrated PID control with sleep/wake function, overpressure feedback protection, and underpressure protection — ideal for maintaining constant water pressure across the supply network without manual intervention.

4. Quick PID Setpoint Adjustment
PID setpoints can be adjusted directly via the digital knob, without navigating through parameter menus — simplifying on-site commissioning and adjustment.

5. Motor Ground Fault Protection
Real-time monitoring of motor grounding status and output phase loss, providing comprehensive protection for the connected motor.

6. Speed Tracking & Flying Start
Compatible with speed detection cards for fan and pump applications, enabling smooth startup and automatic restart without shock after momentary power loss — particularly valuable for critical continuous-operation equipment.

7. Extensive Expansion Options
Supports a wide range of I/O expansion cards and relay output expansion cards to match diverse system integration needs.

8. Reliable Communication
Stable RS485 communication with optional isolated communication cards for strong anti-interference performance in industrial environments.

9. Parameter Backup & Restore
Once parameters are configured, users can back up settings and restore them with one click — reducing commissioning time for multi-unit installations.

Applications

The Wolong WD400 series is widely used across water-related infrastructure and heavy industrial pump systems, including:

• Municipal Water Supply & Water Conservancy Projects

• Large-Scale Oil Transfer Pumps

• Power Plant Boiler Induced Draft Fans

• Circulating Water Pumps

• Blast Furnace Blowers

• Induced Draft Fans

Wolong VFD

With built-in PID control, flexible V/F modes, and reliable motor protection, the Wolong WD400 series helps water supply plants and industrial pump systems achieve stable pressure control, reduced energy consumption, and extended equipment lifespan.