Versatile Industrial VFD for Reliable Motor Control

The Wolong WD200 General Purpose Variable Frequency Drive (VFD) is a high-performance AC drive designed for a wide range of industrial motor control applications.

With a broad power range, multiple voltage classes, flexible control modes and comprehensive protection functions, the WD200 provides a reliable solution for applications requiring accurate speed control, torque control, energy-efficient operation and stable motor performance.

The WD200 supports V/F control, Sensorless Vector Control (SVC) and Closed-Loop Vector Control (FVC), making it suitable for applications ranging from standard variable-speed loads to demanding industrial machinery.

The drive covers power ratings from 0.75 kW up to 1000 kW, with voltage options including single-phase 220 VAC, three-phase 220 VAC, three-phase 380 VAC and three-phase 690 VAC.

Designed for industrial automation and motor drive systems, the WD200 can be applied across industries including fans, pumps, compressors, marine equipment, metallurgy, injection molding, mining, textiles, oil and gas, petrochemicals, HVAC and power generation.

WD200 VFD Key Features

Wide Power Range

The WD200 is available in multiple power and voltage configurations to meet different motor and application requirements.

This wide range enables the WD200 platform to cover small machine drives as well as high-power industrial motor applications.

Multiple Motor Control Modes

The WD200 supports several motor control methods, allowing users to select the appropriate control strategy according to motor type, load characteristics and application requirements.

V/F Control

V/F control provides a simple and reliable solution for conventional variable-speed applications such as fans, pumps and other loads where advanced speed or torque control is not required.

Sensorless Vector Control – SVC

Sensorless Vector Control provides improved low-speed performance, starting torque and speed regulation without requiring a motor encoder.

The WD200 can provide:

150% rated torque at 0.5 Hz

under SVC operation.

This makes the drive suitable for applications requiring higher starting torque and stable low-speed operation.

Closed-Loop Vector Control – FVC

Closed-Loop Vector Control uses feedback from the motor to achieve higher speed and torque control accuracy.

Under FVC operation, the WD200 can provide:

200% rated torque at 0 Hz

and speed control accuracy of up to:

±0.05% of rated speed

This makes FVC suitable for applications requiring precise speed regulation, high starting torque and stable operation at zero or very low speed.

High Starting Torque

The WD200 is designed to provide high starting torque for demanding industrial loads.

Under Sensorless Vector Control:

150% rated torque at 0.5 Hz

Under Closed-Loop Vector Control:

200% rated torque at 0 Hz

The high starting torque capability helps motors accelerate smoothly under heavy loads and reduces the risk of starting failure in demanding applications.

Typical applications include conveyors, heavy-duty machinery, hoists, compressors and other equipment with high starting torque requirements.

High Speed Control Accuracy

The WD200 provides high-precision motor speed regulation.

Under SVC:

Speed control accuracy: ≤0.1% of rated speed

Under FVC:

Speed control accuracy: ≤0.05% of rated speed

The high control accuracy helps improve process stability and product consistency in industrial applications requiring precise motor speed.

Stable Low-Speed Operation

The WD200 maintains stable motor operation at very low frequencies.

Under SVC:

Stable rated-load operation down to 1 Hz

Under FVC:

Stable rated-load operation down to 0 Hz

This low-speed performance is particularly important for applications requiring controlled acceleration, low-speed positioning, high starting torque or continuous operation at low motor speed.

High Efficiency

The maximum efficiency of the WD200 can reach 98%.

Efficient power conversion and optimized motor control can help reduce energy losses during motor operation.

For variable-load applications such as fans and pumps, variable-speed motor control can also provide an effective way to optimize equipment operation and reduce unnecessary energy consumption.

Actual system efficiency depends on the drive power rating, motor efficiency, load profile, operating frequency and installation conditions.

Excellent Voltage and Current Suppression

Industrial motor loads can experience sudden load changes, transient current and voltage fluctuations.

The WD200 incorporates voltage and current suppression functions to help control the effects of sudden load changes and reduce excessive electrical stress on the motor and drive.

These functions contribute to more stable operation and can help reduce unexpected equipment trips and production downtime.

Rich Standard I/O Resources

The WD200 provides comprehensive standard input and output interfaces for connection with PLCs, sensors, control systems and other industrial automation equipment.

Standard Digital and Analog Interfaces

Digital Inputs

7 digital inputs

Analog Inputs

2 analog inputs

Analog Outputs

2 analog outputs

Relay Outputs

2 relay outputs

Transistor Output

1 transistor output

High-Speed Pulse Output

1 high-speed pulse output

These standard interfaces provide flexible signal communication for speed references, start/stop commands, feedback signals, alarms and other control functions.

Advanced Industrial Control Functions

The WD200 includes a wide range of built-in control functions for industrial automation.

PID Closed-Loop Control

Integrated PID control can be used for pressure, flow, temperature and other process control applications.

Typical applications include constant-pressure water supply, HVAC systems, fan systems and pump systems.

Master-Slave Control

The master-slave function allows multiple drives to coordinate their operation for applications requiring synchronized motor control.

Droop Control

Droop control can be used to distribute load between multiple motors or drives and improve coordinated operation.

Simple PLC

The built-in simple PLC function allows users to create basic sequential control logic without requiring a separate external PLC for certain applications.

Multi-Speed Operation

Multi-speed control allows predefined speed settings to be selected according to the process requirements.

Speed Mode and Torque Mode

The WD200 supports both speed control mode and torque control mode, providing flexibility for different motor drive applications.

Strong Grid Adaptability

The WD200 is designed with a wide-voltage concept to accommodate different industrial power supply environments.

The product can meet the requirements of 380–480 V three-phase power systems, covering common industrial grid conditions in regions including:

Europe, North America and India

Different input voltage classes are available according to product model and application requirements.

Robust Environmental Design

Industrial equipment may be exposed to dust, humidity, temperature variations and other harsh environmental conditions.

The WD200 control boards are coated with protective conformal coating over 100% of the board surface, helping improve resistance to environmental contamination and extend component service life.

The drive also adopts an independent air duct design, helping separate the cooling airflow for major thermal components from sensitive control electronics.

This design improves environmental adaptability and contributes to long-term operational reliability in industrial environments.

Comprehensive Protection Functions

The WD200 includes multiple software and hardware protection functions designed to protect the drive, motor and connected equipment.

Protection functions include:

• Output-to-ground short-circuit protection

• Internal pre-charge relay protection

• Fan drive circuit protection

• External 24 VDC short-circuit protection

• Motor overload protection

• Overcurrent protection

• Overvoltage protection

• Undervoltage protection

• Other drive and motor protection functions

The protection system continuously monitors operating conditions and responds to abnormal conditions to improve overall system reliability.

Flexible Braking Configuration

The WD200 supports different braking configurations according to motor power and application requirements.

0.75–22 kW: Built-in braking unit as standard

30–160 kW: Built-in braking unit available as an option

185 kW and above: External braking unit

The braking configuration can be selected according to the motor inertia, deceleration time, load characteristics and braking requirements of the application.

For high-inertia loads or applications requiring rapid deceleration, an appropriate braking resistor and braking system should be selected according to the actual duty cycle.

Compact Book-Type Design

The WD200 adopts a book-type compact design to reduce the installation space required inside electrical cabinets.

Compared with conventional drive designs, the overall volume can be reduced by approximately 30%, depending on the model.

The compact structure provides greater flexibility for:

• Control cabinet design

• Machine integration

• Multi-drive installation

• Electrical panel optimization

• Space-constrained industrial equipment

The book-type configuration is particularly suitable for equipment manufacturers and system integrators who need to maximize cabinet space utilization.

Optional LCD Keypad

An optional LCD keypad is available for parameter configuration, operating status monitoring and drive control.

The LCD interface helps technicians view key operating information and configure drive parameters during commissioning and maintenance.

This provides a more convenient human-machine interface for industrial equipment manufacturers, system integrators and maintenance personnel.

Applications

The WD200 general-purpose VFD is designed for a broad range of industrial motor applications.

Fans and Blowers

Variable-speed control for industrial ventilation, exhaust systems, process fans and air-handling equipment.

Pumps

Suitable for water pumps, industrial pumps, pressure-control systems, circulation systems and process pumps.

Compressors

Provides variable-speed control for compressors requiring adjustable motor speed and controlled acceleration.

Marine Applications

The WD200 can be configured for selected marine and shipboard motor drive applications according to project requirements.

Metallurgy

Suitable for conveyors, fans, pumps, auxiliary machinery and other motor-driven equipment used in metallurgical production.

Injection Molding

Provides accurate speed and torque control for injection molding machinery and auxiliary systems.

Mining

Suitable for mining equipment such as conveyors, pumps, fans and other industrial motor-driven systems.

Textile Machinery

The high-precision vector control capability makes the WD200 suitable for textile machinery requiring stable motor speed.

Oil and Gas / Petrochemical

Suitable for pumps, fans, compressors and other auxiliary equipment used in oil, gas and petrochemical facilities, subject to the applicable project and environmental requirements.

HVAC

PID control and variable-speed operation make the WD200 suitable for heating, ventilation and air-conditioning applications.

Power Generation

Can be used for auxiliary motor applications in power plants and energy facilities.

WD200 for OEM and System Integrators

The WD200 is suitable not only for individual motor applications but also for OEM equipment manufacturers, electrical panel builders and system integrators.

Its combination of broad power coverage, multiple control modes, rich I/O resources and compact design allows the same product platform to be integrated into different types of industrial equipment.

The WD200 can be configured according to:

Motor Power → Input Voltage → Motor Type → Control Mode → Load Characteristics → Speed Requirement → Braking Requirement → I/O Configuration

This makes the platform suitable for customized industrial automation projects and machine-building applications.

WD200 General Purpose VFD – Key Benefits

Wide Power Range
0.75 kW to 1000 kW, covering low-power machines through high-power industrial drives.

Multiple Voltage Classes
Available for 220 V, 380 V and 690 V industrial power systems.

Flexible Motor Control
Supports V/F, SVC and FVC control.

High Starting Torque
Up to 150% rated torque at 0.5 Hz in SVC and 200% rated torque at 0 Hz in FVC.

High Speed Accuracy
Up to ≤0.05% rated-speed error under FVC.

Low-Speed Stability
Stable rated-load operation down to 0 Hz under FVC.

High Efficiency
Maximum drive efficiency up to 98%.

Rich I/O Resources
Multiple digital, analog, relay, transistor and high-speed pulse interfaces are included as standard.

Advanced Control Functions
PID, master-slave control, droop control, simple PLC and multi-speed functions.

Strong Environmental Adaptability
Conformal-coated control boards and independent air duct design improve reliability in industrial environments.

Comprehensive Protection
Multiple drive, motor, electrical and control protection functions.

Compact Book-Type Design
Approximately 30% volume reduction compared with conventional designs, depending on model.

Flexible Braking
Built-in or external braking solutions according to power and application requirements.

Technical Specifications

Why Choose Wolong WD200?

The WD200 combines the functions required for modern industrial motor control in a single scalable VFD platform.

From standard fans and pumps to high-power industrial machinery, the WD200 provides flexible motor control, high starting torque, precise speed regulation, extensive I/O resources and comprehensive protection.

Its broad voltage and power range makes it suitable for global industrial applications, while its compact book-type architecture helps simplify control cabinet integration.

For OEMs, system integrators and industrial end users, the WD200 provides a practical and scalable platform for AC motor control, variable-speed drives and industrial automation.

Frequently Asked Questions

What is the Wolong WD200?

The Wolong WD200 is a general-purpose variable frequency drive designed for industrial AC motor speed and torque control.

What is the power range of the WD200?

The WD200 covers a broad power range from 0.75 kW to 1000 kW, depending on the input voltage class.

Does the WD200 support 690 V motors?

Yes. The WD200 is available in a three-phase 690 VAC voltage class, with power ratings from 22 kW to 1000 kW.

What control modes does the WD200 support?

The WD200 supports V/F control, Sensorless Vector Control (SVC) and Closed-Loop Vector Control (FVC). It also supports speed and torque control modes.

What is the maximum starting torque of the WD200?

Under SVC, the drive can provide up to 150% rated torque at 0.5 Hz.

Under FVC, it can provide up to 200% rated torque at 0 Hz.

What is the speed control accuracy?

Speed control accuracy can reach ≤0.1% of rated speed under SVC and ≤0.05% under FVC, according to the specified operating conditions.

How low can the WD200 operate?

Under SVC, the drive can support stable rated-load operation down to 1 Hz.

Under FVC, rated-load operation can be maintained down to 0 Hz, subject to the motor, feedback system and application conditions.

What applications is the WD200 suitable for?

The WD200 can be used in fans, pumps, compressors, marine equipment, metallurgy, injection molding, mining, textile machinery, oil and gas, petrochemical, HVAC and power-generation applications.

Does the WD200 have built-in protection functions?

Yes. The WD200 includes multiple protection functions such as motor overload protection, output-to-ground short-circuit protection, fan circuit protection, internal pre-charge relay protection and external 24 VDC short-circuit protection.

Does the WD200 support braking?

Yes. Depending on the power rating, the braking unit can be built in, optionally integrated or configured externally.

Is the WD200 suitable for OEM applications?

Yes. The WD200 is suitable for OEM equipment manufacturers, panel builders and system integrators requiring a scalable industrial motor drive platform.