Sense operating demand
Pressure, differential pressure, flow, temperature, vibration and air-quality signals describe the process and equipment state.
Industrial fan VFD control from low-voltage ventilation to 6 kV and 10 kV process fans.
WD200 and WD5100 help airflow and pressure follow real process demand, with smooth starting, flying start, resonance avoidance and plant-level integration.
Airflow and pressure control
380–480 V, 6 kV and 10 kV
Flying start and resonance avoidance
Multi-fan, damper and SCADA integration
Make airflow follow actual process demand.
Production load, furnace conditions, temperature, smoke volume and air quality change continuously. A fixed-speed fan controlled mainly by a damper can keep the motor running fast while useful airflow is restricted.
Wolong combines WD200 low-voltage and WD5100 medium-voltage drives with pressure, differential-pressure, flow, temperature or air-quality sensors, PLC, HMI and SCADA or DCS. The solution scales from individual ventilation equipment to large forced- and induced-draft fans.
Calculate the setpoint
Built-in PID or the plant controller compares feedback with the required airflow, pressure or process condition.
Adjust fan speed
WD200 or WD5100 changes motor speed instead of relying only on throttling, while respecting minimum speed and resonance bands.
Coordinate the system
PLC and DCS logic manage dampers, duty and standby fans, interlocks, alarms, trends and remote operation.
One drive platform for low- and medium-voltage fan systems.
Configure motor control, process feedback, mechanical limits and plant communications around the actual fan and duct system.
Demand-based PID control
Control static pressure, differential pressure, flow, temperature or air quality. WD200 includes PID; WD5100 can work with local or PLC/DCS closed-loop control.
Smooth high-inertia starting
Controlled acceleration reduces starting current and mechanical shock. Ramp time is selected from fan inertia, motor thermal limits and process requirements.
Flying start and recovery
Track a fan that is still rotating from natural draft, process flow or inertia before taking control, with restart logic engineered for the duty.
Resonance-band avoidance
Skip frequencies and controlled transit help avoid identified mechanical resonance zones. Final bands must be confirmed by field vibration testing.
Multi-fan and damper coordination
Plant logic can stage, rotate and bypass fans, verify damper positions and prevent reverse flow or unstable pressure.
Open digital integration
Modbus and optional industrial networks connect operating data, alarms and commands with HMI, SCADA, DCS or building systems.
From field instruments to the control room.
The architecture separates sensing, drive, coordination and monitoring so each project can add only the functions it needs.
- Sensing: pressure, flow, temperature, vibration and damper position
- Drive: WD200 low-voltage or WD5100 6 kV/10 kV VFD
- Control: PID, PLC/DCS sequencing and process interlocks
- Monitoring: HMI, SCADA, trends, alarms and energy data
For the fan duties that protect processes, people and plant availability.
Process air and dust extraction
Forced draft, induced draft, dust collection, flue-gas treatment, kiln cooling and high-temperature exhaust.
Mine and tunnel ventilation
Main and local ventilation with remote monitoring, standby switching and project-specific emergency strategies.
Factories, cooling and HVAC
Supply, exhaust, cooling-tower and air-handling fans coordinated with temperature, pressure and air quality.
Boiler forced and induced draftVOC and flue-gas treatmentBuilding and car-park ventilation
More stable airflow, lower mechanical stress and clearer operations.
Reduce throttling losses
Match fan speed to current demand and create room for energy optimization compared with permanent high-speed operation.
Improve starts and stops
Controlled ramps reduce electrical and mechanical shock on motors, couplings, impellers and ductwork.
Manage fan availability
Station logic balances runtime, coordinates standby equipment and improves fault handling.
See abnormal conditions earlier
Trends, alarms, vibration and temperature data support inspection and maintenance planning.
Select the platform around motor voltage, fan inertia and process continuity.
Final selection must be checked against motor current, fan and system curves, minimum speed, resonance zones, ambient conditions, bypass requirements and project standards.
ParameterWD200WD5100
Application levelLow-voltage fans and distributed ventilation6 kV/10 kV large process fans
Voltage and rating380–480 V; 0.75–710 kW6 kV: 250–9,000 kVA
10 kV: 250–16,000 kVA
10 kV: 250–16,000 kVA
Motor typesIM and PMSMIM, excited synchronous motor and PMSM
Control modesV/F, SVC, FVC, separated V/FV/F, SVC and FVC
Output frequency0–599 Hz0–120 Hz; higher frequency by project
CommunicationsModbus RTU; PROFIBUS-DP, PROFINET and CANopen optionalCAN, Modbus RTU/TCP; PROFIBUS-DP optional
Engineering limits matter as much as speed control.
Large-inertia starting time, motor self-cooling, minimum fan speed, vibration zones, damper position and process interlocks must be verified during application engineering. WD5100 can be configured with modular power cells, optical communication, cell bypass and power-loss recovery functions for continuity-critical systems.
Fire or emergency-smoke modes, forced-operation limits and protection bypasses are system-level decisions subject to the project design and local regulations.
Industrial fan VFD questions.
Why is variable speed effective for centrifugal fans?
At similar system conditions, reducing speed can reduce required shaft power more effectively than damper throttling. Actual savings require fan and system curves plus operating data.
When should I choose WD200 or WD5100?
WD200 is normally selected for 380–480 V fans; WD5100 is engineered for 6 kV and 10 kV large fan motors. Inertia, minimum speed and process continuity must also be checked.
Can a rotating fan be restarted?
Flying start can identify current speed and direction before taking control. Motor data, rotation direction and process safety must be validated first.
Can you guarantee a fixed energy-saving percentage?
No. Results depend on load profile, damper position, static-pressure share, fan and motor efficiency, operating hours and control settings.
Get an industrial fan drive solution for your project.
Share fan and motor data, airflow and pressure range, inertia, operating profile, resonance information, dampers, number of fans, bypass needs and control-system requirements. Our team can help define the drive and system architecture.