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Variable Frequency Drive(VFD)丨3‑Phase BK-ZHB Series(45~55kw)
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Descripción
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
| Power Capacity (KW/HP) | 45KW/60HP,55KW/75HP | |
| Fase | Trifásico | |
| Entrada | Rango de tensión | 380~440VAC/500~800VDC |
| Rated Frequency | 47~63Hz | |
| Factor de potencia | ≥0.95 (when input reactor is optional) | |
| Salida | Rated Voltage Range | 0~440VAC |
| Gama de frecuencias | 0~600Hz | |
| Capacidad de sobrecarga | 150% rated current/60s, 180% rated current/3s; | |
| Torque Characteristic | 150% rated torque at 3.0Hz (V/F control); 150% rated torque at 0.25Hz (SVC mode) | |
| Frequency Resolution | Digital setting 0.01Hz; Analog input maximum frequency × 0.025% | |
| Forma de onda | Onda sinusoidal pura | |
| Distorsión armónica | THD＜2% for linear load; THD＜7% for non-linear load | |
| Control | Control Mode | V/F control (linear, multi-point, N-th power curve), Sensorless Vector Control (SVC) |
| V/F Curve Options | 1.2nd power, 1.4th power, 1.6th power, 1.8th power, 2nd power, supporting VF full separation/half separation mode | |
| Torque Boost | Automatic boost; Manual setting 0.0%~30.0% | |
| Acceleration/Deceleration Time | 0.0s~6500.0s continuously adjustable, supporting S-type and linear mode | |
| Carrier Frequency | 0.5kHz~16.0kHz continuously adjustable, supporting automatic adjustment with temperature | |
| Speed Control Precision | Steady-state precision ≤±0.2% rated synchronous speed; Speed fluctuation ≤±0.5% rated synchronous speed | |
| Torque Response Time | ≤20ms (Sensorless Vector Control) | |
| Motor Parameter Self-detection | Supports static and dynamic parameter automatic detection | |
| Función de protección | Overcurrent | Quick shutdown when overcurrent occurs during acceleration/deceleration/constant speed, with fault code alarm |
| Overvoltage/Undervoltage | Overvoltage: ＞760V (configurable); Undervoltage: ＜350V (configurable), graded frequency reduction or shutdown | |
| Overheating | Module temperature ≥75℃ for early warning, ≥100℃ for shutdown | |
| Sobrecarga | Dual protection for inverter overload and motor overload, overload early warning coefficient adjustable from 50% to 100% | |
| Phase Loss | Automatic detection, fault alarm and shutdown | |
| Other Protections | Short circuit, module fault, electronic thermal relay, input/output phase loss, motor parameter tuning abnormality, internal memory fault, etc. | |
| Communication & Interface | Communication Interface | RS485 (485+, 485- terminals) |
| Communication Protocol | Modbus-RTU protocol | |
| Baud Rate | 1200BPS~115200BPS adjustable | |
| Data Format | No parity (8-N-2/8-N-1), Even parity (8-E-1), Odd parity (8-O-1) | |
| Analog Input | AI1 (0~10V/0~20mA), AI2 (0~10V); Input impedance 100KΩ (voltage)/500Ω (current) | |
| Analog Output | AO1, AO2 (0~10V/0~20mA), supporting display of 16 physical quantities | |
| Digital Input | 7-channel multi-function terminals (X1~X7), 0~24V level signal, active low | |
| Digital Output | 1-channel open-collector output, 1-channel high-speed pulse output, 2-channel programmable relay outputs | |
| Medio ambiente | Temperatura de funcionamiento | -10℃~40℃; Derating required when 40℃~50℃ |
| Humedad de funcionamiento | 5%~95%RH, no condensation | |
| Altitud | ≤1000m; Derate 10% for every 1000m increase | |
| Vibration Requirement | ＜0.5G (avoid damage from falling) | |
| Structure and Installation | Nivel de protección | IP20 |
| Método de refrigeración | Air cooling (with intelligent fan control) | |
| Método de instalación | Wall-mounted/Cabinet-type | |
Model Comparison Chart
| BK-ZHB570 Series | Power (KW /HP) | Size (MM) L*W*H | N.W(KG) |
| BK-ZHB570-45KW | 45KW/60HP | 260*255*510 | 20 |
| BK-ZHB570-55KW | 55KW/75HP | 260*255*510 | 20 |
Note:
- The size and weight vary depending on the voltage range, and are subject to the customized actual product.
- DC Input is also customizable. Please contact the sales team before placing the order.
✅ FAQs – 45–55kW Three-Phase Variable Frequency Drive (VFD)
Q1: What are the most common applications for a 45–55kW VFD?
This power range is widely used in heavy-duty industrial systems such as screw air compressors (60–75 HP), cooling tower fans, large centrifugal pumps, mining conveyors, extrusion linesy boiler feedwater systems. It’s the sweet spot for facilities needing robust, continuous-duty motor control with significant energy savings.
🔍 Keywords: 55kW VFD applications, 45kW VFD for air compressor, 75HP industrial VFD, medium-large VFD uses
Q2: Can I use a 55kW VFD to drive a 45kW motor? Is oversizing recommended?
Yes—and it’s often recommended for high-inertia or frequent-start applications (e.g., crushers, loaded conveyors). A 55kW VFD provides thermal headroom, reduces stress on components, and supports future motor upgrades. Just ensure your cable sizing and protection devices match the VFD output rating.
🔍 Keywords: 55kW VFD for 45kW motor, oversizing VFD best practices, VFD kW vs motor HP, safe VFD derating
Q3: Does this VFD support energy-saving control for large HVAC or water systems?
Absolutely. Our 45–55kW models feature multi-pump PID cascade control, sleep modey adaptive V/F curves—ideal for district cooling plants, high-rise building HVAC, or municipal water supply. Typical energy savings: 30–50% versus fixed-speed operation.
🔍 Keywords: 55kW VFD for HVAC, multi-pump VFD control, energy-saving fan drive, constant pressure VFD 50kW
Q4: What overload and starting torque capabilities does it offer?
It delivers 150% rated current for 60 seconds y 200% torque at 0.5Hz (in vector mode), enabling smooth starts for high-inertia loads like large fans or fully loaded belts—without mechanical stress or voltage dips.
🔍 Keywords: 55kW VFD high starting torque, 150% overload VFD, low-speed torque VFD, heavy-load VFD
Q5: Can this VFD be installed in harsh environments like steel mills or cement plants?
Yes. The standard unit features conformal-coated PCBs, sealed heat sink channels, and operates reliably from -10°C to +50°C. For extreme dust/moisture, choose our IP54-rated enclosure version—tested in mining and metallurgy applications.
🔍 Keywords: rugged 55kW VFD, IP54 VFD for cement plant, industrial VFD for steel mill, high-temperature VFD
Q6: Does it comply with international harmonic standards like IEEE 519?
The base model meets EN 61800-3 Category C2. For installations requiring THD <5% (e.g., hospitals, data centers, or grid-sensitive sites), we offer integrated DC choke + optional active front-end (AFE) or harmonic filter—ensuring compliance with IEEE 519 and local utility regulations.
🔍 Keywords: low-harmonic 55kW VFD, IEEE 519 compliant VFD, THD <5% VFD, active front-end VFD
Q7: How do I integrate it with a PLC or SCADA system in a factory?
All units include Modbus RTU (RS485) as standard. Optional communication modules support Profinet, EtherNet/IP, CANopen, or BACnet/IP, enabling real-time speed control, fault logging, and remote diagnostics via your existing automation network.
🔍 Keywords: 55kW VFD with Profinet, SCADA-compatible VFD, industrial VFD with Ethernet, smart factory VFD
Q8: What accessories are typically needed for a 50kW VFD installation?
For most applications, you’ll need:
- Line reactor (to protect against voltage spikes)
- Braking resistor (if decelerating heavy loads quickly)
- EMC filter (for commercial or sensitive environments)
We provide a free system checklist y wiring diagram upon request to ensure code-compliant installation.
🔍 Keywords: 50kW VFD accessories, braking resistor for 55kW VFD, line reactor VFD, VFD installation kit
Preguntas frecuentes
¿Qué es UPS?
¿Cuál es la función principal del SAI?
¿Cuáles son los tipos de SAI?
¿Cómo elegir la capacidad de potencia del SAI?
¿Cómo se determina el tiempo de espera de un SAI?
