Variable Frequency Drive(VFD)丨3‑Phase BK-ZHB Series(285~450kw)

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The BK-ZHB570 series (3 Phase) heavy-duty industrial frequency inverter و 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 و 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.

التطبيقات

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

ميزات المنتج

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 inverterو 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 و 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.

المواصفات

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.

✅ FAQs – 285–450kW Three-Phase Variable Frequency Drive (VFD)

Q1: What defines the 285–450kW VFD segment in industrial automation?
This power range represents the transition from standard industrial drives to engineered drive systems. Unlike smaller VFDs, units in this class often feature:

• Modular power design (e.g., parallel IGBT modules for redundancy)
• Multi-level inverter topologies (3-level NPC or T-type) for lower dv/dt and motor stress
• Integrated transformer or DC bus sharing for multi-drive coordination
• Full compliance with grid codes (IEEE 519, EN 50160, G5/4-1)
  They are deployed where failure means production stoppage or public service disruption.

🔍 Keywords: 450kW engineered VFD, modular high-power drive, 3-level VFD topology, industrial drive system 400kW

Q2: Where are 300–450kW VFDs most commonly installed?
Typical mission-critical applications include:

• Municipal raw water intake & long-distance transmission pumps (400–600 HP)
• Main hoists and skip systems in deep underground mines
• Primary air compressors for steel or petrochemical plants
• Shipboard HVAC and ballast pump systems (marine-certified versions)
• Hot strip mill entry/exit conveyors in metal rolling lines
  These systems run 24/7 and require minimal maintenance over decades.

🔍 Keywords: 450kW VFD for water transmission, mine hoist VFD 400kW, marine VFD 350kW, rolling mill VFD system

Q3: How is harmonic distortion controlled at 400kW+ without external filters?
At this scale, passive filters become impractical. Instead, two advanced architectures are used:

• 18- or 24-pulse diode front-end with integrated phase-shifting transformer (THD <5%)
• Active Front End (AFE) with 3-level IGBTs (THD <3%, regenerative capability, PF ≈1.0)
  Both eliminate the need for bulky harmonic filters and simplify utility interconnection studies.

🔍 Keywords: 450kW VFD AFE, 24-pulse VFD system, low THD high-power drive, regenerative 400kW VFD

Q4: Can the VFD support regenerative braking or energy feedback?
Yes—units with Active Front End (AFE) topology can feed braking energy back to the grid during deceleration (e.g., lowering a loaded mine skip or stopping a large fan). This reduces heat dissipation, eliminates braking resistors, and lowers net energy consumption by 5–15% in cyclic applications.

🔍 Keywords: regenerative 450kW VFD, four-quadrant VFD 400kW, energy feedback VFD, AFE VFD for hoist

Q5: What cooling and enclosure options are available for continuous-duty operation?
Standard: Forced-air cooled IP21 cabinet with filtered intake.
For harsh environments:

• IP54 sealed enclosure with internal heat exchanger
• Water-cooled option (for confined spaces or >50°C ambient)
  All designs include redundant cooling fans و thermal monitoring per IGBT module to prevent hot spots.

🔍 Keywords: water-cooled 450kW VFD, IP54 high-power VFD, redundant cooling VFD, VFD for >50°C ambient

Q6: How is system reliability ensured in critical infrastructure?
Key engineering features include:

• Hot-swappable control board (no shutdown for firmware updates)
• Parallel power modules (N+1 redundancy—failure of one module triggers load sharing, not trip)
• Real-time diagnostics via Ethernet (IGBT temperature, capacitor ESR, grid THD)
• Predictive maintenance alerts based on operating hours and thermal cycles

🔍 Keywords: redundant 450kw VFD, hot-swap VFD control board, predictive maintenance VFD, N+1 VFD system

Q7: What communication and cybersecurity features support modern SCADA integration?
Beyond standard Modbus TCP, these VFDs support:

• Profinet IRT / EtherNet/IP with CIP Security
• OPC UA server with certificate-based authentication
• IEC 62443-compliant firewall and port control
  All data streams (speed, torque, energy, faults) can be securely routed to cloud platforms or central control rooms.

🔍 Keywords: 450kW VFD with OPC UA, IEC 62443 VFD, secure industrial VFD, CIP Security VFD

Q8: Are special installation or civil works required for a 400kW VFD?
Yes. Typical requirements include:

• Dedicated electrical room with ≥1m clearance on all sides
• Reinforced floor (unit weight: 600–1200 kg)
• Separate grounding rod (<0.5Ω impedance)
• HVAC or exhaust ducting to manage ~8–15 kW of heat loss
  Most projects involve coordination between electrical, mechanical, and civil teams during the FEED phase.

🔍 Keywords: 450kW VFD installation requirements, VFD room design, grounding for high-power VFD, heat dissipation 400kW drive