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Variable Frequency Drive(VFD)丨3‑Phase BK-ZHB Series(30~37kw)
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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) | 30KW/40HP,37KW/50HP | |
| 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-ZHB570-30KW | 30KW/40HP | 212*220*395 | 9.5 |
| BK-ZHB570-37KW | 37KW/50HP | 212*220*395 | 10 |
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 – 30–37kW Three-Phase Variable Frequency Drive (VFD)
Q1: What applications is a 30–37kW three-phase VFD typically used for?
This power range is ideal for medium-duty industrial systems such as booster pump stations, HVAC centrifugal fans, screw air compressors (30–50 HP), packaging conveyors, and wastewater treatment blowers. It balances performance, cost-efficiency, and compact footprint—perfect for factories, commercial buildings, and municipal facilities.
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Q2: Can I use a 37kW VFD to replace a 30kW motor—or vice versa?
Yes, but with caution. A 37kW VFD can safely drive a 30kW motor (providing headroom for overload). However, using a 30kW VFD on a 37kW motor risks overheating and tripping. We recommend matching the VFD rating to the motor nameplate or sizing up by one frame for future expansion or high-inertia loads.
🔍 Keywords: 37kW VFD for 30kW motor, VFD motor sizing guide, can I oversize a VFD, VFD kW vs motor kW
Q3: Does this 30–37kW VFD support constant pressure control for water pumps?
Absolutely. Our 30–37kW models include built-in PID controllers and sleep/wake functions for multi-pump systems. They automatically adjust motor speed to maintain set pressure—reducing energy use by 25–40% compared to fixed-speed operation in residential, commercial, or irrigation pumping stations.
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Q4: Is this VFD suitable for direct wall mounting in an electrical room?
Yes. The standard enclosure is IP20-rated with optimized airflow design, allowing safe wall mounting in clean, indoor environments (e.g., pump rooms, control panels). For dusty or humid areas (like food processing or mining), we offer optional IP54-rated versions with conformal-coated PCBs.
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Q5: What’s the overload capacity of this 30–37kW VFD?
It delivers 150% rated current for 60 seconds y 180% for 3 seconds, making it reliable for high-inertia starts (e.g., large fans or loaded conveyors). This ensures stable operation during transient load spikes without nuisance tripping.
🔍 Keywords: 37kW VFD overload capacity, 150% overload VFD, heavy-duty start VFD, high-torque VFD for conveyors
Q6: Can I integrate this VFD into a Building Management System (BMS) or PLC?
Yes. All models come standard with Modbus RTU (RS485). Optional communication cards support BACnet MS/TP, Modbus TCP, or CANopen, enabling seamless integration with BMS (for HVAC control) or factory PLCs for centralized monitoring and scheduling.
🔍 Keywords: 37kW VFD with Modbus, BACnet VFD for BMS, PLC-compatible VFD, smart building VFD
Q7: Does it include built-in EMC filtering for compliance with EU/US standards?
Standard units meet EN 61800-3 Category C2 (industrial environments). For installations near sensitive equipment or in commercial buildings, we recommend adding our optional Class A/B EMC filter to comply with stricter emission limits (e.g., IEEE 519 or local grid codes).
🔍 Keywords: EMC compliant 37kW VFD, low-harmonic VFD, EN 61800-3 VFD, VFD for commercial buildings
Q8: What’s included in the box? Do I need extra accessories?
Each unit ships with a terminal cover, mounting brackets, and user manual. For most pump/fan applications, no extra parts are needed. However, for regenerative loads (e.g., elevators) or long motor cables (>50m), you may require a braking resistor o output reactor—available as add-ons.
🔍 Keywords: 30kW VFD package contents, braking resistor for 37kW VFD, output reactor VFD, what’s included with VFD
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?
