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Ball Mill Special Inverter | Energy-Saving VFD for Mining

The VDN100Q Series is a specialized high-performance inverter developed for energy-saving control of ball mills. Unlike standard drives, it utilizes an innovative, dedicated control algorithm that dynamically adjusts the motor speed based on real-time load conditions within the ball mill. By optimizing the speed profile rather than running at a constant speed, the VDN100Q significantly reduces energy consumption, provides soft-start capabilities, and enhances overall system efficiency, delivering substantial economic benefits for customers in the mining, cement, and mineral processing industries.

Installation Type:
Plastic casing
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HUAKIA VDN Series VFD Selection Guide

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Key technical parameter

ItemParameter
Power Range:
Standard Models: 93kW – 280kW (Three-Phase 380V)
Full Series Capability: Up to 630kW available upon request (based on platform capabilities)
Input Voltage:
Three-phase 380V: -15% ~ +15%, 50/60Hz ±5%
Protection Level:
IP20
Control Model:
Based on rotor field-oriented vector transformation,
calculating torque current and current fluctuation for optimal speed control; Additional Modes: Sensorless Vector Control (SVC), V/F Control.
Overload Capacity:
150% rated current for 60 seconds (Typical G-type performance)
Starting Torque:
Large starting torque: Starting current controlled to less than 2x rated current.
High torque output ensures smooth startup even under full load.
Braking Unit:
Built-in DC Reactor (Standard).
Braking unit configuration depends on model and customer requirements.
Communication:
vfd Communication
Protection:
Comprehensive protections: Over-current, over-voltage, under-voltage,
overload, input/output phase loss, short-circuit, and more.

Our advantage

Significant Energy Savings
Achieves energy savings of 12% - 20% . When replacing a hydraulic coupler with an elastic coupling, savings can reach 23% - 25% or more.
Dedicated Ball Mill Algorithm
Features a unique dynamic power-saving control program. It monitors stator current in real-time, calculates average torque and current fluctuation, and determines the real-time optimal speed to reduce average operating speed while maintaining grinding efficiency.
Excellent Soft-Start Characteristics
Limits the starting current to less than twice the motor's rated current. This eliminates sharp power drops and voltage sags during startup, preventing nuisance tripping and production stoppages.
Enhanced Power Factor & Transformer Utilization
The built-in DC reactor improves the power factor to above 0.97, increasing the effective capacity of the supply transformer by approximately 20%.
Intelligent Monitoring & Control
Features a user-friendly Chinese LCD interface for real-time monitoring of output current, voltage, frequency, and equipment status. It allows setting of milling time and automatic shutdown, simplifying management.
Comprehensive Protections
Includes complete protection functions for the ball mill and drive, such as over-current, over-voltage, overload, under-voltage, phase loss, and short-circuit protection.
High Return on Investment
The investment payback period is short due to direct electricity savings. Additionally, it reduces mechanical stress, lowering the maintenance rate for mill components and the motor, and extending equipment service life.

HUAKIA VFD Series: Frequently Asked Questions (FAQ)

This FAQ provides answers to common questions about HUAKIA's VDN series Variable Frequency Drives (VFDs), covering models VDN100, VDN200, VDN300, VDN500, VDN700, and VDN900. This guide is optimized for users seeking reliable motor control solutions.

A Variable Frequency Drive (VFD) controls the speed and torque of an AC induction motor by varying the frequency and voltage of its power supply. HUAKIA’s VDN series VFDs are designed for high performance and reliability across various industries, including textile, paper making, wire drawing, machine tools, packaging, food processing, fans, and pumps. Our drives feature advanced vector control technology, providing excellent low-speed torque, fast dynamic response, and robust overload protection for demanding automation applications.

To select the right VFD, you must match the drive’s output current and power rating (kW) to your motor’s full load current and power. First, check your motor’s nameplate for its rated voltage (e.g., 380V), current (Amps), and power (kW). Then, refer to the “Rated Output Current” table in our manuals (e.g., for VDN500/700/900). Choose a VFD model (G-type for constant torque loads like conveyors, or P-type for variable torque loads like fans and pumps) whose rated output current is equal to or greater than your motor’s rated current. For high-starting torque loads (e.g., hoists, extruders), select a G-type model and consider oversizing the VFD by one power level.

The HUAKIA VDN series offers versatile control modes to suit different performance needs:

  • V/F Control (Voltage/Frequency): Suitable for basic speed control, multi-motor applications, or when motor parameters are unknown (e.g., VDN100, VDN200).

  • Sensorless Vector Control (SVC): Provides high starting torque (up to 150% at 0.5Hz) and good speed accuracy without an encoder. Ideal for most general-purpose high-performance applications (e.g., VDN700, VDN900).

  • Closed-Loop Vector Control (FVC): Requires an encoder (PG card) on the motor. Offers zero-speed full torque, the highest speed accuracy (±0.02%), and precise torque control for demanding applications like hoisting and elevators (e.g., VDN500, VDN900).

Auto-tuning is critical for optimal vector control performance. The process is:

  1. Correctly set the motor’s nameplate parameters (rated power, voltage, current, frequency, speed) in the P1 group (or similar) of the VFD parameters.

  2. For Static Tuning (motor shaft cannot be uncoupled), set the tuning parameter (e.g., P1-37=1 for VDN500/700, H-62=2 for VDN300) to measure stator and rotor resistance.

  3. For Dynamic Tuning (best performance, uncouple motor from load), set the tuning parameter (e.g., P1-37=2) to measure all motor parameters.

  4. After setting the parameter, press the RUN key on the VFD’s keyboard. The drive will perform the measurement and stop automatically. The motor will run briefly during dynamic tuning.

Overcurrent (OC) and overvoltage (OV) are common faults often caused by incorrect parameter settings.

  • Overcurrent (OC) fault: Usually occurs during acceleration or heavy load. Solution: Increase the acceleration time (e.g., P0-17), decrease the torque boost value (e.g., E04.01 for VDN900), or check for mechanical blockages.

  • Overvoltage (OV) fault: Often happens during deceleration due to load inertia generating energy back to the VFD. Solution: Increase the deceleration time (e.g., P0-18), enable the overvoltage stall protection (e.g., P3-23=1 for VDN500), or add a braking resistor/unit. For a comprehensive guide, refer to the ‘Fault Diagnosis’ chapter in your specific model’s manual.

No, you cannot. The VDN series (e.g., VDN100-300, VDN500-900) three-phase models are designed specifically for three-phase power input. Connecting them to a single-phase supply will cause a fault and potentially damage the drive. If you only have single-phase power, you must purchase a model specifically designed for single-phase input, typically available for smaller power ratings (e.g., VDN100-S2 series for 220V single-phase).

To ensure long life and reliable operation, regular maintenance is key.

  • Daily: Check the ambient temperature, unusual motor noise/vibration, and cooling fan operation.

  • Every 3-6 months: Inspect for loose terminals, dust buildup on the heatsink, and corrosion. Clean the VFD with compressed air. Tighten all power terminals to the specified torque.

  • Every 2-3 years: The cooling fans may need replacement as they are mechanical wear parts.

  • Every 4-5 years: The main circuit DC bus capacitors should be checked, and their usable life is typically 4-5 years depending on ambient temperature and load.

The VDN series drives are designed for easy integration into industrial automation systems. They support multiple communication protocols via optional plug-in cards:

  • Standard: Modbus RTU (RS485) is available on most models like VDN100, VDN200, VDN300, and VDN500.

  • Optional: Via dedicated expansion cards, the VDN series can support Profibus-DP, CANlink, and CANopen for more advanced fieldbus requirements.

Standard VFD operation is specified for altitudes up to 1000m (about 3280 feet). If you install a VDN series VFD at a higher altitude, the air is thinner, which reduces the drive’s cooling capacity.

  • Derating: You must “derate” the VFD, meaning you must reduce the output current to prevent overheating. A common rule (for VDN100, VDN700) is to reduce the rated output current by 1% for every 100m above 1000m. The maximum recommended altitude for standard models is typically 3000m. Please consult the specific manual or HUAKIA support for precise derating factors.

HUAKIA provides a standard 18-month warranty from the date of manufacture (as indicated by the product serial number) for all VDN series VFDs. This warranty covers repair or replacement of the product if the failure is due to confirmed manufacturing defects or component failure under normal operating conditions. The warranty does not cover damage caused by improper installation, misuse, overloading, or external factors like fire, flood, or lightning.