Advanced Industrial VFD for High-Torque, Precision and Intelligent Motor Control

The Wolong WD400 High-Performance Variable Frequency Drive (VFD) is an advanced industrial AC drive designed for demanding motor control applications where high starting torque, precise speed regulation, strong overload capability, zero-speed control and intelligent connectivity are required.

Built on Wolong's advanced motor control algorithms, the WD400 delivers up to 200% starting torque and provides excellent low-speed and zero-speed control performance.

The WD400 is also designed for modern Industry 4.0 applications, supporting PC-based commissioning and parameter management, remote monitoring, fault warning, data visualization and integration with industrial communication networks and IoT platforms.

With a wide power range from 0.75 kW to 1000 kW and voltage classes from 220 VAC to 690 VAC, the WD400 provides a scalable solution for machine builders, OEMs, system integrators and industrial end users.

WD400 VFD Key Features

Ultra-High Starting Torque

The WD400 uses advanced Wolong motor control algorithms to provide extremely high starting torque.

The drive can deliver:

Up to 200% starting torque

This high starting torque capability allows the motor to start reliably under heavy loads and helps reduce the risk of startup failure.

The WD400 is particularly suitable for industrial equipment with high static loads, high inertia or demanding acceleration requirements.

Typical applications include heavy-duty conveyors, cranes, hoists, compressors, extruders, material-handling equipment and other machinery requiring high starting torque.

Excellent Zero-Speed Control

One of the key advantages of the WD400 is its advanced zero-speed control capability.

The drive is designed to maintain stable motor control even under demanding low-speed and zero-speed conditions.

Rated Load Applied at Zero Speed

When rated load is suddenly applied while the motor is at zero speed, the control observer can rapidly converge, helping maintain stable feedback speed with no significant speed drop.

This provides improved control performance for applications where load changes may occur at or near zero speed.

Smooth Deceleration to 0 Hz

During deceleration toward 0 Hz, the WD400 maintains stable speed control with minimal speed fluctuation.

Under rated load at zero speed, the system can maintain stable operation, helping reduce mechanical impact during stopping and improve overall equipment reliability.

This makes the WD400 suitable for applications where precise stop control, low-speed stability or zero-speed torque is important.

High-Performance Vector Control

The WD400 incorporates advanced vector control technology to achieve accurate motor control over a wide operating range.

The drive provides high dynamic response and stable torque control for demanding industrial applications.

Its control platform supports advanced motor-control functions designed to improve:

Starting performance

Low-speed operation

Speed regulation

Torque response

Acceleration and deceleration

Forward/reverse transition

Load disturbance response

The WD400 is therefore suitable for machinery requiring significantly higher control performance than conventional V/F drives.

Excellent Forward and Reverse Switching Control

The WD400 provides smooth control during forward/reverse switching.

During direction changes, the torque-current waveform remains smooth, helping reduce sudden current spikes and mechanical impact.

When linear acceleration and deceleration are configured, the drive provides accurate acceleration and deceleration timing with excellent tracking performance.

This is particularly valuable for machines requiring frequent direction changes, rapid reversing or coordinated motion.

Potential applications include:

• Conveyors

• Material handling systems

• Cranes and hoists

• Reversing machinery

• Metal-processing equipment

• Industrial winding equipment

• Machine tools

High-Precision Torque Control

The WD400 is designed for applications requiring accurate torque regulation.

In torque control mode, the actual output torque can closely follow the commanded torque.

The specified torque control linearity deviation can reach approximately:

±3%

This enables more accurate torque regulation under different load conditions and makes the WD400 suitable for applications where motor torque is a critical process parameter.

Typical examples include tension control, winding systems, material handling equipment, extrusion and other torque-sensitive industrial machinery.

Strong Overload Capability

The WD400 provides strong short-term overload capability for demanding industrial loads.

The drive can support:

150% rated current for 60 seconds

This capability enables the inverter to withstand temporary load increases and current peaks without unnecessary trips.

It is particularly useful for equipment with:

• High starting loads

• Variable load conditions

• Impact loads

• High inertia

• Short-term overload requirements

Wide Power and Voltage Range

The WD400 is available in multiple voltage classes and power ratings, making it suitable for both low-power machinery and high-power industrial motor systems.

The broad product range allows OEMs and system integrators to build standardized drive platforms across different machine sizes and power requirements.

Designed for Industry 4.0

The WD400 is more than a conventional motor inverter. It is designed as an intelligent drive platform for modern industrial automation and Industry 4.0 environments.

PC-Based Virtual Control Console

The WD400 can be connected to a PC-based software platform featuring a virtual control console and parameter monitoring interface.

Users can perform a variety of commissioning and maintenance operations, including:

• Online commissioning

• Motor parameter auto-tuning

• Motor parameter learning

• Parameter copying

• Parameter loading

• Parameter monitoring

• User access and permission management

These functions help simplify commissioning and reduce the time required for drive configuration and maintenance.

Intelligent Remote Monitoring and IIoT Connectivity

The WD400 can be integrated with an optional IoT communication module for remote equipment management.

Depending on the system configuration, users can implement:

Remote equipment inspection

Remote fault warnings

Equipment status monitoring

Visualized operating data

Remote diagnostics

Cloud-based data management

The platform can be adapted to different cloud environments and industrial digitalization systems, helping users move from conventional local drive management toward connected and intelligent equipment management.

This makes the WD400 suitable for factories implementing predictive maintenance, remote service and digital production management strategies.

Comprehensive Industrial Communication

The WD400 supports a broad range of industrial communication interfaces and optional communication cards.

Supported protocols and network interfaces can include:

• Modbus

• PROFIBUS-DP

• PROFINET

• EtherCAT

• CANopen

• Ethernet

• IoT communication modules

This communication flexibility allows the WD400 to be integrated with:

• PLC systems

• DCS systems

• SCADA systems

• Industrial PCs

• Motion control systems

• Factory automation networks

• Cloud and IIoT platforms

The drive can therefore serve as part of an integrated industrial automation and energy-management system.

Built-In DC Reactor for Improved Power Quality

The WD400 range is equipped with a built-in DC reactor as standard.

The DC reactor helps improve the input power factor and reduce the impact of harmonic current on the electrical supply system.

Benefits can include:

• Improved power quality

• Reduced reactive power demand

• Lower harmonic impact

• Improved input current characteristics

• Reduced stress on the power supply system

This standard configuration makes the WD400 suitable for installations where electrical power quality and system efficiency are important considerations.

Wide-Voltage Grid Compatibility

The WD400 is designed to operate across common industrial power supply environments.

The product platform supports international industrial voltage systems, including common 380–480 V three-phase networks, helping simplify deployment in different regions.

This makes the WD400 suitable for global OEM and industrial projects in markets including Europe, North America, India and other regions using comparable industrial power systems.

The exact input voltage range should be selected according to the specific WD400 model and local grid requirements.

Robust Industrial Design

The WD400 is designed for reliable operation in demanding industrial environments.

Its hardware and thermal design focus on long-term operational stability and simplified maintenance.

Depending on the model and installation configuration, the product platform can be integrated into industrial control cabinets and automated production equipment.

The WD400 is suitable for applications requiring continuous operation, variable loads and frequent acceleration or deceleration.

Global Compliance and Certifications

The WD400 has been developed with international markets and global industrial applications in mind.

Relevant product configurations and markets can support international compliance and certification requirements including:

CE

EAC

UL

CSA

Certification availability and status may vary by model, voltage class, market and product configuration. Customers should confirm the applicable certificate and certification status for their specific order before purchase.

These international compliance capabilities help support the use of WD400 drives in global OEM equipment and industrial projects.

Applications

The WD400 High-Performance VFD is designed for demanding applications across a wide range of industries.

Heavy-Duty Conveyors

High starting torque and strong overload capability make the WD400 suitable for conveyor systems with heavy starting loads and variable material loads.

Cranes and Hoists

Advanced low-speed and torque control can support applications requiring controlled acceleration, deceleration and load handling.

Compressors

The WD400 provides stable speed and torque control for industrial compressor systems.

Metallurgy

Suitable for demanding motor applications in metal-processing and metallurgical production environments.

Injection Molding

High dynamic response and accurate torque control can support demanding injection molding machinery and auxiliary equipment.

Mining

The high starting torque and overload capability are suitable for heavy-duty mining equipment such as conveyors, pumps, fans and processing machinery.

Textile Machinery

Precise speed and torque regulation can support textile production equipment requiring stable motor performance.

Oil and Gas / Petrochemical

The WD400 can be applied to selected motor-driven equipment in oil, gas and petrochemical facilities according to project requirements and applicable environmental regulations.

HVAC

PID control and variable-speed operation make the WD400 suitable for HVAC fans, pumps and other variable-speed systems.

Power Generation

The drive can be used for selected auxiliary motor systems in power generation facilities.

General Industrial Automation

The combination of vector control, intelligent communication and extensive configuration functions makes the WD400 suitable for a broad range of industrial automation systems.

WD400 for OEMs and System Integrators

The WD400 is designed to support OEM equipment manufacturers, electrical panel builders, automation companies and system integrators.

Its broad power range and flexible communication architecture allow the same drive platform to be used across different machine models and automation architectures.

The WD400 can be integrated according to:

Motor Power → Voltage → Motor Type → Control Mode → Load Characteristics → Torque Requirements → Communication Network → Braking Requirements → Remote Monitoring

This enables equipment manufacturers to build standardized, scalable and connected motor-drive platforms.

WD400 vs. Conventional General-Purpose VFDs

The WD400 is positioned as a higher-performance drive platform for applications where standard VFD control may not be sufficient.

Compared with basic variable frequency drives, the WD400 emphasizes:

Higher Starting Torque

Up to 200% starting torque for demanding startup conditions.

Better Zero-Speed Control

Stable control performance during zero-speed loading and deceleration to 0 Hz.

Higher Torque Control Accuracy

Torque control linearity deviation can reach approximately ±3%.

Stronger Overload Capability

150% rated current for 60 seconds.

More Advanced Digital Functions

PC-based commissioning, parameter management, user permissions and remote monitoring.

Broader Industrial Communication

Modbus, PROFIBUS-DP, PROFINET, EtherCAT, CANopen, Ethernet and IoT connectivity options.

Global Market Orientation

International compliance and certification capabilities for different markets.

Technical Specifications

Why Choose the Wolong WD400?

The WD400 combines high-performance motor control with intelligent industrial connectivity.

For applications requiring more than basic variable-speed operation, the WD400 provides a combination of:

200% starting torque

Excellent zero-speed control

High-precision torque regulation

150% overload capability for 60 seconds

Wide power range up to 1000 kW

220 V, 380 V and 690 V voltage classes

Built-in DC reactor

Advanced industrial communication

PC-based commissioning and parameter management

IIoT and remote monitoring capability

International market compliance

The result is a high-performance industrial drive platform capable of supporting both conventional motor control applications and modern connected automation systems.

Frequently Asked Questions

What is the Wolong WD400?

The Wolong WD400 is a high-performance industrial variable frequency drive designed for demanding AC motor control applications requiring high starting torque, precise speed and torque control, strong overload capacity and intelligent connectivity.

What is the power range of the WD400?

The WD400 covers power ratings from 0.75 kW to 1000 kW, depending on the voltage class and model.

Is the WD400 available for 690 V applications?

Yes. The three-phase 690 VAC version covers 22 kW to 1000 kW.

What starting torque can the WD400 provide?

The WD400 can provide up to 200% starting torque, depending on the control mode, motor and operating conditions.

Can the WD400 operate at zero speed?

Yes. The WD400 features advanced zero-speed control and is designed to maintain stable performance during zero-speed loading and deceleration toward 0 Hz.

What is the overload capacity?

The WD400 can provide 150% rated current for 60 seconds under the specified operating conditions.

Does the WD400 support torque control?

Yes. The WD400 supports torque control and can achieve approximately ±3% torque-control linearity deviation, subject to the specified application and operating conditions.

What communication protocols are supported?

The WD400 can support Modbus, PROFIBUS-DP, PROFINET, EtherCAT, CANopen, Ethernet and IoT communication options through the corresponding interfaces or communication cards.

Can the WD400 be monitored remotely?

Yes. With an appropriate IoT communication module, the WD400 can support remote inspection, fault warning, operating-data visualization and integration with cloud platforms.

Is the WD400 suitable for Industry 4.0 applications?

Yes. The WD400 provides PC-based commissioning, parameter management, communication-network integration and optional IIoT connectivity, making it suitable for connected industrial automation systems.

Is the WD400 suitable for OEM applications?

Yes. The wide power range, multiple voltage classes, communication options and flexible control functions make the WD400 suitable for OEM equipment manufacturers and system integrators.