Variable Frequency Drive(VFD)丨3‑Phase BK-ZHB Series(180~250kw)

Productos

The BK-ZHB570 series (3 Phase) heavy-duty industrial frequency inverter y variable frequency drive (VFD) is a high-performance current vector AC drive specifically engineered for heavy-duty industrial applications requiring three-phase power supply. As a professional frequency converter y inverter drive, it is ideally suited for driving general-purpose three-phase AC asynchronous motors, and excels in powering equipment with high starting impact, continuous heavy loads, and rigorous operational demands—such as industrial crushers, large ball mills, heavy-duty elevators (equipped with dedicated elevator drive), hydraulic presses, steel rolling mill auxiliaries, and mining conveyors (matched with specialized conveyor drive).

This three-phase heavy-duty VFD supports two advanced control modes: voltage-to-frequency ratio control (V/F control) and sensorless vector control (SVC). As a reliable frequency inverter, it boasts an overload capacity of 1.5 times the rated current, outstanding low-frequency high-torque output performance (150% rated torque at 0.25Hz in SVC mode), and a comprehensive fault protection mechanism (including overcurrent, overvoltage, undervoltage, overheating, phase loss, and short-circuit protection). Designed to adapt to three-phase grid characteristics, this AC drive can effectively withstand grid voltage fluctuations, minimize equipment energy losses, and significantly enhance the operational stability and energy efficiency of large-scale industrial production.

Its core design focuses on high reliability, robust environmental adaptability, and precise control under heavy-duty conditions. Through optimized heat dissipation structures, reinforced circuit layouts, and industrial-grade component selection, this frequency converter ensures long-term stable operation in harsh industrial environments—such as high-temperature workshops, dusty mining sites, and humid processing plants—meeting the uninterrupted operation demands of critical industrial processes.

Aplicaciones

The BK-ZHB570 Series Heavy-Duty Inverter Drive is widely applied in high-load industrial scenarios and critical infrastructure, providing stable, efficient, and precise drive solutions for heavy-duty equipment with high starting torque requirements and harsh operating conditions:

Heavy Industry & Metallurgy

• Steel rolling mills, continuous casting equipment powered by industrial frequency inverter
• Non-ferrous metal smelting & calendering machines with high-performance VFD
• Ore crushers, ball mills, and mineral processing equipment matched with frequency converter
• Metallurgical hoisting cranes, ladle transfer equipment equipped with AC drive

Mining & Construction Materials

• Mine belt conveyors with dedicated conveyor drive, bucket elevators
• Cement mill drives, rotary kilns powered by heavy-duty variable frequency drive
• Stone crushers, sand making machines supported by inverter drive
• Construction tower cranes, hoisting systems with reliable frequency inverter

Port & Logistics Handling

• Shore container cranes, gantry cranes equipped with VFD
• Grab ship unloaders, bulk material handlers matched with AC drive
• Heavy-duty conveyors with specialized conveyor drive, automated storage stackers
• Container loading/unloading equipment powered by frequency converter

Chemical & Petroleum Industry

• Chemical reactor agitators, pressure vessel drives with industrial frequency inverter
• Oil drilling rigs, well workover machines supported by variable frequency drive
• Large air compressors, reciprocating pumps powered by inverter drive
• Pipeline transportation pumps, oil refining equipment matched with VFD

Water Treatment & Environmental Protection

• Sewage lifting pumps with dedicated pump inverter, sludge dewatering presses
• Aeration blowers (equipped with fan inverter), chemical dosing pumps
• Waste incineration plant grate drives powered by frequency converter
• Desalination plant high-pressure pumps supported by AC drive

New Energy & Power Systems

• Wind turbine pitch control systems with VFD
• Solar energy storage system pumps matched with pump inverter
• Power plant boiler feed pumps, induced draft fans (equipped with fan inverter)
• New energy vehicle production line heavy-duty conveyors with conveyor drive

HVAC & General Industrial

• HVAC systems powered by specialized HVAC inverter for energy-saving operation
• Ventilation equipment with high-efficiency fan inverter
• Building water supply systems matched with pump inverter
• General industrial machinery supported by versatile variable frequency drive

Agriculture & Food Processing

• Large agricultural machinery (combine harvesters, tractors) with frequency inverter
• Grain drying equipment, bulk material conveyors equipped with conveyor drive
• Oil press machines, food extrusion equipment powered by AC drive
• Feed grinder drives, mixing machines matched with VFD

Características del producto

Diversified and Precise Control Technology

As a professional variable frequency drive (VFD), it supports two control modes (V/F control, SVC open-loop vector control), which can be flexibly switched according to the characteristics of heavy-duty equipment. This industrial frequency inverter can output 150% rated torque at a low frequency of 0.25Hz, with strong loaded starting capability and a steady-state speed accuracy of ≤±0.2%, meeting the precise speed regulation needs of pump inverter, fan invertery elevator drive applications.

Intelligent Integration and Interconnection Capability

This frequency converter is built-in with PID controller and preset frequency function, which can directly connect to closed-loop process control such as pressure and flow. Standard-equipped with RS485 communication interface, compatible with Modbus-RTU protocol, this AC drive facilitates remote control and system integration with PLC and upper computer, reducing the difficulty of automation transformation for conveyor drive y HVAC inverter systems.

Stable and Reliable Heat Dissipation and Protection Design

The fully sealed structure of the heat dissipation duct effectively isolates dust and moisture, with strong environmental adaptability. Combined with intelligent air-cooled control, this inverter drive has excellent heat dissipation efficiency, ensuring long-term stable operation in the industrial environment of -10℃~40℃. The IP20 protection level complies with industrial on-site installation specifications, reducing the external environment impact on pump inverter, fan inverter, and other specialized applications.

Comprehensive Safety Protection System

This VFD integrates 9 core protection functions, including output phase loss, instantaneous current, overvoltage, undervoltage, overheating, overload, overcurrent, braking and short circuit protection. It fully avoids equipment failure risks under heavy-duty working conditions for industrial frequency inverter applications, maximizing the service life of motors and frequency converter.

Convenient and Adaptable Installation and Working Condition Compatibility

The installation process is simple, with two installation methods (wall-mounted and cabinet-type) to adapt to different on-site spaces. The carrier frequency is adjustable from 0.5kHz to 16.0kHz, which can balance low-noise operation and load adaptability, and can match the drive needs of various heavy-duty equipment such as crushers, cranes, and specialized pump inverter, fan inverter, elevator drive, conveyor drive systems.

Especificaciones

Model Comparison Chart

Note:

1. The size and weight vary depending on the voltage range, and are subject to the customized actual product.
2. DC Input is also customizable. Please contact the sales team before placing the order.

Preguntas frecuentes

1. What is a three-phase Variable Frequency Drive (VFD)?A three-phase VFD (also called frequency inverter) converts three-phase AC power to adjustable frequency/voltage, controlling AC motor speed for heavy industrial equipment.
2. How does this industrial AC drive differ from single-phase models?It supports 0.75~630KW high power, targets heavy-load scenarios (crushers, conveyors), and offers stronger overload capacity—ideal for large-scale industrial use.
3. Can this pump inverter / fan inverter be used for high-pressure pumps?Yes, it’s optimized for industrial pumps/fans, with 150% low-frequency torque and stable output, matching high-pressure pump/fan drive needs.
4. What advantages does this conveyor drive / elevator drive have?It provides precise speed control (≤±0.2% steady-state precision) and comprehensive protection, ensuring safe, uninterrupted operation for heavy-duty conveyors/elevators.
5. Why choose this industrial frequency inverter for harsh environments?Its sealed heat dissipation and IP20 protection resist dust/moisture, operating stably at -10℃~40℃—suited for mining, steel mill, and chemical plant conditions.

✅ FAQs – 180–250kW Three-Phase Variable Frequency Drive (VFD)

Q1: What types of industrial systems typically require a 180–250kW VFD?
This high-power range is commonly deployed in:

• Municipal water transmission & high-rise booster pumping stations (250–350 HP)
• Main ventilation fans in underground mines or tunnels
• Large centrifugal or screw air compressors for automotive or chemical plants
• Primary ore conveyors, crushers, and hoisting systems
• Cooling water circulation for power generation or data centers
  These applications demand robust thermal design, high starting torque, and minimal downtime.

🔍 Keywords: 250kW VFD applications, 300HP industrial VFD, VFD for mine ventilation fan, large water pump VFD 200kW

Q2: How should I size a 250kW VFD for a high-inertia load like a large fan or crusher?
For high-inertia or frequent-start applications, it’s critical to verify the load inertia ratio y acceleration time. A 250kW VFD can typically handle motors up to 250kW with:

• 150% overload for 60 seconds
• Torque boost at low frequency (e.g., 180% at 1Hz in vector mode)
  Use the motor’s locked-rotor current y start-up time to validate thermal capacity—oversizing by one frame is common in mining or recycling.

🔍 Keywords: 250kW VFD for high-inertia load, sizing VFD for crusher, torque boost at low speed, locked rotor VFD calculation

Q3: Is harmonic distortion a concern at this power level? How is it managed?
Yes—harmonics scale with power. Standard units include a built-in DC-link choke, reducing THD to ~25–30%. For utility compliance (e.g., IEEE 519), two proven solutions are available:

• 18-pulse diode rectifier with phase-shifting transformer (THD <8%)
• Active Front End (AFE) topology (THD <3%, unity power factor)
  Both eliminate the need for external harmonic filters and simplify grid interconnection approval.

🔍 Keywords: 250kW VFD harmonic mitigation, AFE VFD 200kW, 18-pulse VFD system, IEEE 519 compliant high-power drive

Q4: Can this VFD operate reliably in high ambient temperatures or dusty environments?
Yes. The design incorporates:

• Forced-air cooling with filtered intake
• Conformal-coated control boards
• High-temperature electrolytic capacitors
  Standard operation: -10°C to +50°C. With derating, continuous operation up to +55°C is achievable—suitable for desert regions, steel mills, or cement kiln areas.

🔍 Keywords: high-temperature 250kW VFD, dust-resistant VFD for cement plant, +55°C VFD operation, industrial VFD for harsh environment

Q5: What communication protocols support integration into a plant-wide automation system?
All models support Modbus TCP/IP over Ethernet as standard. Optional embedded interfaces include:

• Profinet IRT (for synchronized multi-drive lines)
• EtherNet/IP with CIP Motion
• CANopen over DS402 profile
  Real-time data (speed, torque, energy, faults) can be streamed to SCADA, MES, or cloud platforms via OPC UA.

🔍 Keywords: 250kW VFD with Profinet IRT, EtherNet/IP VFD for factory automation, OPC UA VFD, industrial IoT VFD 200kW

Q6: What installation considerations are critical for 200kW+ VFDs?
Key factors include:

• Cabinet type: Floor-standing IP21/IP54 enclosure required (wall-mount not recommended)
• Ventilation: Minimum 500mm clearance on top/sides; consider ducted exhaust in confined rooms
• Cabling: Use shielded motor cables (<100m); install line reactors if >50m
• Grounding: Low-impedance earth connection (<1Ω) to prevent bearing currents
  Detailed layout and thermal simulation drawings are typically provided by engineering teams during design phase.

🔍 Keywords: 250kW VFD installation guide, floor-standing VFD cabinet, VFD cable length limit, line reactor for 200kW VFD

Q7: Does the VFD support multi-pump or multi-fan coordination?
Yes. Built-in PID cascade control allows one master VFD to coordinate up to 4 auxiliary pumps/fans based on system pressure or flow demand. Features include:

• Auto-rotation for even wear
• Sleep/wake logic during low demand
• Dry-run protection
  Ideal for district heating, irrigation networks, or HVAC central plants.

🔍 Keywords: 250kW VFD for multi-pump system, cascade PID VFD, central HVAC VFD control, dry-run protection VFD

Q8: How is motor protection implemented at this power level?
Advanced protection includes:

• Electronic thermal overload modeling (IEC 60947-4-2 compliant)
• Ground fault detection (sensitive to 30mA)
• Phase loss/unbalance monitoring
• Bearing current suppression via common-mode filter (optional)
  These features help prevent motor burnout—critical when replacement costs exceed $20k.

🔍 Keywords: motor protection 250kW VFD, ground fault VFD, phase unbalance detection, bearing current suppression VFD