Changsha Changli Group Co., Ltd.

Its core business is electric motor manufacturing.

Key products include standard asynchronous motors, variable-frequency speed-regulating motors, permanent magnet motors, high-efficiency energy-saving motors, wound-rotor motors, and large synchronous motors.

The products have a wide range of applications.

They are used in industries such as metallurgy, papermaking, chemicals, cement machinery, electric power, and water conservancy, and are exported to regions including Europe, Southeast Asia, the United States, and Russia.

INVT GD5000 Series                                                                                                                                                  

The general-purpose, two-quadrant medium-voltage variable frequency drive is suitable for applications such as centrifugal pumps, fans, compressors, screw compressors, blowers, refiners, mixers, extruders, belt conveyors, presses, kilns, mills, and hot gas expanders.

VFD Functional Features                                                                                                                                              

I: Three Control Modes

1. High-performance V/F Control: Suitable for general-purpose loads such as fans, pumps, and air compressors; offers stable operation and broad applicability.

2. Open-loop Vector Control: Adapted for equipment like belt conveyors, mill drives, and fiber shredders; features fast dynamic response and strong load adaptability.

3. Closed-loop Vector Control: Designed for high-precision, high-torque loads such as internal mixers and hoists; provides high speed-regulation accuracy and stable torque output.

2: Support for Multiple Motor Types

Capable of stably driving both asynchronous and synchronous motors (including permanent magnet synchronous motors); versatile and compatible with mainstream motor types on the market.

3: Low-Voltage Ride-Through (LVRT)

Features robust wide-voltage interference immunity and Automatic Voltage Regulation (AVR); maintains stable output despite frequent DC bus voltage fluctuations. Supports continuous operation during momentary power outages (ride-through time adjustable from 0 to 5 seconds), effectively preventing equipment shutdowns caused by voltage instability or brief power interruptions.

4: Universal Speed ​​Tracking

Accurately identifies real-time motor speed and direction without external speed sensors, enabling smooth speed-tracking startups. Adjustable automatic startup time (0–3600 seconds) accommodates various restart scenarios involving high-inertia loads.

5: Flying Start

Eliminates the need for shutdown or reset during brief power interruptions (under 5 seconds); the VFD rapidly tracks the motor's residual speed and automatically resumes operation, preventing production downtime and ensuring continuous equipment performance.

6: Multi-Unit Bypass Mode

Equipped with unit-level bypass protection; automatically bypasses a faulty power unit while maintaining uninterrupted system operation. Supports neutral-point drift bypass technology, utilizing intelligent CPU calculations to correct output and ensure balanced, stable voltage and current.

7: Superior Low-Frequency Control Performance

Utilizes advanced dead-time compensation to optimize low-frequency output waveforms; features a dedicated low-frequency oscillation suppression algorithm to completely eliminate motor resonance and jitter at low speeds, ensuring smooth and stable operation.

8: Master-Slave Control Mode

Supports coordinated multi-motor drive, achieving precise power balancing and synchronized operation through master-slave control. Capable of driving multiple motor loads with a single variable frequency drive (VFD) and compatible with flexible grid-connection schemes. Utilizes an optical ring connection architecture, allowing up to 16 VFDs to be linked in a single master-slave system to meet the demands of large-scale, multi-equipment coordinated operations.

9: Intelligent Thermal Management and Dust/Corrosion Protection

Employs professional thermal simulation technology combined with a highly reliable heat dissipation structure. The cabinet features an independent air duct design to effectively minimize dust accumulation and reduce the risk of heat buildup. PCBs are treated with a double-sided conformal coating, offering excellent resistance to corrosion, moisture, and dust, thereby significantly enhancing the equipment's protection rating and service life.

10: Extensive Bus Communication Interfaces

Compatible with mainstream industrial communication protocols such as Modbus, Profibus-DP, Profinet, and UDP/IP. It enables rapid integration with user DCS control systems, facilitating equipment networking, data interoperability, centralized monitoring, and intelligent management.

11: IoT Cloud Platform Monitoring

Optional 2G/4G IoT communication modules enable connection to a dedicated cloud data center, allowing for real-time remote monitoring of operating status, data traceability, and fault early warning. This significantly reduces troubleshooting time and O&M costs, enabling intelligent, unmanned equipment operation and maintenance.

Product Details                                                                                                                                                                  

Customization: Available

Applications: High-performance sensors, three-phase sensors, general-purpose sensors, high-frequency converter sensors

Output Type: Dual

Every motor must undergo testing before leaving the factory. Motors are shipped only after passing inspection. A test report is included with each motor.