High-Performance VFD Solutions for Cranes, Hoists and Material Handling Equipment

The Wolong CD Series Crane Duty Variable Frequency Drives (VFDs) are a new generation of high-performance, multifunctional vector drives specially developed for crane and material handling applications.

The CD Series is designed to provide advanced control of asynchronous motors (induction motors) used in lifting, traveling, slewing and other crane motions.

Compared with conventional industrial VFDs, the CD Series integrates control functions specifically designed for crane applications, including advanced current vector control and built-in functions for complex crane processes such as anti-sway control and grab-bucket operation.

The result is a dedicated drive platform for demanding lifting and material-handling applications requiring accurate speed control, stable torque, smooth acceleration and coordinated motion.

The CD Series includes two product platforms:

CD800 High-Performance Crane Duty VFD

Designed for demanding crane applications requiring advanced control performance and complex crane process functions.

CD300 Compact Low-Power Crane Duty VFD

A compact and economical crane drive designed for smaller lifting and material-handling equipment.

CD Series Key Features

Dedicated Crane Control Platform

The CD Series has been specifically developed for crane duty applications rather than being adapted from a conventional general-purpose VFD.

Its control functions are optimized for the operating characteristics of cranes, including:

• Lifting and lowering

• Horizontal traveling

• Trolley movement

• Slewing

• Positioning

• Load handling

• Grab-bucket operation

• Anti-sway control

• Coordinated crane motion

This dedicated design helps improve crane operating performance and simplify the integration of drive control into crane automation systems.

High-Performance Vector Control for Induction Motors

The CD Series is primarily designed for asynchronous motors, also known as induction motors.

It uses high-performance current vector control technology to achieve accurate control of motor current and torque.

The vector-control system is designed to provide:

High starting torque

Stable low-speed operation

Fast dynamic response

Accurate speed control

Smooth acceleration and deceleration

These characteristics are particularly important for crane systems where load inertia can vary significantly and stable lifting and lowering performance is required.

Designed for Lifting Applications

Lifting mechanisms place demanding requirements on motor control.

The drive must be able to control motor torque during:

Starting

Acceleration

Constant-speed lifting

Deceleration

Stopping

Lowering

The CD Series is designed to provide stable control throughout these operating conditions.

This helps achieve smoother load movement and reduce sudden speed changes and mechanical impact.

Advanced Anti-Sway Control

Load sway is a common challenge in crane operation.

The CD Series can integrate anti-sway control functions to help reduce load swing during crane movement.

By coordinating crane motion and motor control, the system can help improve load positioning and reduce unnecessary oscillation.

Potential benefits include:

• Improved load positioning

• Reduced operator intervention

• Shorter positioning time

• Reduced load swing

• Improved operating efficiency

• Improved crane safety and stability

The exact anti-sway strategy depends on crane configuration, load characteristics, travel speed and control system architecture.

Grab-Bucket Control

For cranes equipped with grab buckets, the CD Series can provide dedicated control functions for complex grab-bucket operating processes.

The control system can be configured according to the specific crane mechanism and application requirements.

This makes the CD Series suitable for material-handling equipment used in environments such as:

• Ports

• Steel mills

• Scrap handling

• Waste handling

• Bulk material handling

• Mining

• Power plants

• Industrial yards

Multiple Crane Motions

A crane typically includes multiple movement mechanisms.

The CD Series can be applied to different crane motions, including:

Hoisting

Precise motor control for lifting and lowering loads.

Traveling

Variable-speed control for bridge and gantry crane travel mechanisms.

Trolley Movement

Controlled movement of the trolley along the crane runway or bridge.

Slewing

Smooth speed and torque control for rotating or slewing mechanisms where applicable.

The appropriate drive configuration should be selected according to the crane mechanism, motor rating, load characteristics and duty class.

Smooth Acceleration and Deceleration

Crane mechanisms frequently start and stop under changing load conditions.

Sudden acceleration or deceleration can result in mechanical shock, load swing and increased stress on the crane structure.

The CD Series provides advanced speed and torque control to support smooth acceleration and deceleration.

This can help:

Reduce mechanical impact

Reduce load swing

Improve operator control

Improve positioning performance

Reduce stress on mechanical components

Increase equipment service life

High Dynamic Response

Crane loads can change rapidly during lifting and material handling.

The CD Series uses high-performance vector control to provide fast response to changes in speed and torque demand.

This helps maintain stable motor operation when:

• Load weight changes

• Acceleration is increased

• The crane transitions between operating speeds

• The load is raised or lowered

• Direction changes occur

• The mechanism stops

High dynamic response is particularly valuable in applications requiring frequent starting, stopping and speed changes.

Reliable Control for Heavy-Duty Material Handling

Crane drives operate in demanding duty cycles and may experience frequent acceleration, braking and load changes.

The CD Series is designed around the operating characteristics of crane machinery and provides a dedicated platform for heavy-duty material-handling applications.

The drive can be configured according to the required motor power, mechanism type, duty cycle and control architecture.

CD Series Product Family

CD800 High-Performance Crane Duty VFD

The CD800 is the high-performance member of the CD Series.

It is designed for demanding crane applications requiring advanced motor control, high dynamic performance and complex crane process functions.

Key application areas include:

• High-performance hoists

• Overhead cranes

• Gantry cranes

• Port cranes

• Heavy-duty lifting machinery

• Steel mill cranes

• Bulk material handling cranes

• Grab cranes

• Complex automated crane systems

The CD800 is suitable for applications where advanced crane control functions and high-performance vector control are required.

CD300 Compact Low-Power Crane Duty VFD

The CD300 is a compact, low-power crane-duty variable frequency drive designed for smaller lifting and material-handling systems.

Its compact design makes it suitable for crane mechanisms where installation space is limited and a dedicated crane control platform is required.

Typical applications include:

• Small hoists

• Small overhead cranes

• Light-duty lifting equipment

• Compact material-handling machinery

• Small trolley systems

• Auxiliary crane mechanisms

The CD300 provides a dedicated crane drive solution while maintaining a compact system footprint.

Typical Crane Applications

Overhead Cranes

The CD Series can be used for hoisting, bridge travel and trolley movement in overhead crane systems.

Gantry Cranes

Suitable for lifting and traveling mechanisms in gantry and portal crane systems.

Port Cranes

The drive can be applied to selected lifting, traveling, trolley and grab-bucket mechanisms in port material-handling equipment.

Steel Mill Cranes

The high-performance vector control platform is suitable for demanding lifting and material-handling applications in steel production environments.

Grab Cranes

Dedicated grab-bucket control functions make the CD Series suitable for bulk material handling and grab crane applications.

Mining and Bulk Material Handling

Suitable for lifting and material-handling systems used in mining and bulk-material facilities.

Waste Handling Cranes

The CD Series can be applied to lifting and grab mechanisms used in waste-handling and waste-to-energy facilities.

Industrial Hoists

Suitable for industrial hoists and specialized lifting machinery requiring precise speed and torque control.

Crane Duty VFD Control Functions

Depending on the product model and system configuration, the CD Series can support dedicated crane functions such as:

Vector control

High-performance current control

Hoisting control

Travel control

Slewing control

Anti-sway control

Grab-bucket control

Speed control

Torque control

Acceleration and deceleration control

These functions allow the drive to be integrated into both conventional crane control systems and more advanced automated crane architectures.

Crane Drive System Integration

A complete crane drive system typically consists of:

Motor + Crane VFD + Brake System + PLC / Control System + Operator Interface + Communication Network

The CD Series can be integrated with the customer's crane control architecture to coordinate motor speed, torque, braking and crane process functions.

For OEMs and crane system integrators, Wolong can provide drive configurations according to:

Motor Power

Motor Voltage

Motor Type

Lifting Capacity

Crane Mechanism

Duty Cycle

Travel Speed

Lifting Speed

Load Inertia

Braking Requirements

Control System

Communication Requirements

This enables the VFD to be matched to the actual crane mechanism rather than treated as a standard motor inverter.

Why Choose the Wolong CD Series?

The CD Series is designed specifically for crane applications and combines industrial VFD technology with dedicated crane process control.

Crane-Specific Design

Developed specifically for lifting and material-handling equipment.

Advanced Vector Control

Provides high-performance current vector control for asynchronous motors.

High Starting and Low-Speed Performance

Supports stable motor operation during demanding lifting and lowering processes.

Anti-Sway Control

Helps reduce load oscillation and improve positioning efficiency.

Grab-Bucket Control

Supports complex crane processes involving grab-bucket mechanisms.

Multiple Crane Motions

Suitable for lifting, traveling, trolley movement and slewing applications.

High Dynamic Response

Provides responsive control during acceleration, deceleration and load changes.

Product Range for Different Applications

CD800 provides high-performance crane control, while CD300 offers a compact solution for low-power crane applications.

Technical Positioning

The CD Series is intended for applications where a standard general-purpose VFD may not provide sufficient crane-specific control functions.

A conventional VFD primarily provides variable-speed motor control.

The CD Series goes further by integrating functions dedicated to crane operation, including:

Motor vector control

Crane mechanism control

Anti-sway functions

Grab-bucket process control

Lifting and lowering control

Traveling control

This makes the CD Series a specialized Crane Duty VFD platform for industrial lifting and material-handling applications.

Frequently Asked Questions

What is the Wolong CD Series?

The Wolong CD Series is a family of dedicated crane-duty variable frequency drives designed for lifting and material-handling applications.

What type of motors does the CD Series support?

The CD Series is primarily designed to drive asynchronous motors, or induction motors, using high-performance current vector control.

What crane mechanisms can the CD Series control?

The CD Series can be applied to hoisting, traveling, trolley movement, slewing and other crane drive mechanisms, depending on the specific product and system configuration.

Does the CD Series support anti-sway control?

Yes. The CD Series can integrate anti-sway control functions for applicable crane systems.

Does the CD Series support grab-bucket cranes?

Yes. Dedicated control functions can be configured for grab-bucket and other complex material-handling processes.

What is the difference between CD800 and CD300?

The CD800 is the high-performance crane drive designed for demanding crane applications and advanced control requirements.

The CD300 is a compact low-power crane-duty VFD designed for smaller lifting and material-handling equipment.

Is the CD Series suitable for overhead cranes?

Yes. The CD Series can be used for hoisting, trolley and bridge travel mechanisms in overhead cranes.

Is the CD Series suitable for port cranes?

Yes. The CD Series can be used for selected lifting, traveling, trolley and grab-bucket applications in port cranes, subject to system requirements.

Can Wolong provide a complete crane drive solution?

Wolong can provide crane VFD solutions that can be integrated with motors, braking systems and crane control systems according to project requirements.