INVT GD350A-3000G-4 High Power Variable Frequency Drive

The INVT GD350A-3000G-4 is a high-power variable frequency drive (VFD) engineered for demanding industrial applications. This VFD leverages advanced vector control technology and a dedicated motor control processor to deliver exceptional performance, flexibility, and reliability. Key advantages include its robust drive capability across multiple motor types, high-precision speed and torque control, and extensive expansion options. The GD350A-3000G-4 is designed to optimize operational efficiency and integrate seamlessly into modern industrial automation systems, offering a powerful solution for complex drive tasks.

Product Specifications

| Parameter                  | Specification                                         |

| :------------------------- | :---------------------------------------------------- |

| Series                     | GD350A                                                |

| Model                      | GD350A-3000G-4                                        |

| Input Voltage              | 380V - 440V AC (3-Phase)                              |

| Output Voltage             | 0 - Input Voltage                                     |

| Output Frequency           | 0 - 400 Hz                                            |

| Motor Types Supported      | Asynchronous, Permanent Magnet Synchronous (PMSM), Synchronous Reluctance (with custom software) |

| Control Modes              | V/F, Sensorless Vector Control (SVC), Closed-Loop Vector Control (VC) |

| Speed Regulation Ratio     | Asynchronous Motor: 1:200 (SVC); Synchronous Motor: 1:20 (SVC), 1:1000 (VC) |

| Speed Control Precision    | ±0.2% (SVC), ±0.02% (VC)                    |

| Torque Response            | <20ms (SVC), <10ms (VC)                     |

| Starting Torque            | Asynchronous Motor: 150% @ 0.25Hz (SVC); Synchronous Motor: 150% @ 2.5Hz (SVC), 200% @ 0Hz (VC) |

| Overload Capacity          | 150% for 1 minute, 180% for 10 seconds, 200% for 1 second |

| Integrated Functions       | Safe Torque Off (STO) compliant with SIL2 |

| Expansion Interfaces       | 3 slots for PG, PLC, Communication, and I/O cards |

| Communication Protocols    | Standard RS485 (Modbus RTU); Optional: PROFINET, CANOPEN, PROFIBUS-DP, Ethernet/IP, Modbus TCP, EtherCAT |

| Cooling                    | Forced Air Cooling                         |

Core Features & Market Positioning

The INVT GD350A-3000G-4 stands out in the high-power VFD market due to its versatile motor compatibility, supporting a wide range of motor types including asynchronous, permanent magnet synchronous (PMSM), and even synchronous reluctance motors with appropriate software. This broad compatibility, coupled with advanced control algorithms like Sensorless Vector Control (SVC) and Closed-Loop Vector Control (VC), ensures optimal performance across various load conditions and applications. The VFD's ability to provide precise speed and torque control, with a torque response as low as <10ms in VC mode, positions it as a premium solution for applications demanding high accuracy and dynamic response. Furthermore, the integration of the Safe Torque Off (STO) function, compliant with SIL2 safety standards, enhances operational safety and reduces the need for external safety devices. The GD350A series is recognized for its strong scalability and support for secondary development, allowing for customized solutions and integration into sophisticated automation systems.

Key Application Scenarios

The INVT GD350A-3000G-4 is engineered for a multitude of industrial applications where precise motor control, high power, and reliability are paramount. Its robust performance characteristics make it ideal for heavy-duty machinery in sectors such as:

  Manufacturing and Processing: Machine tools, printing and packaging equipment, textile machinery, and paper machinery benefit from the GD350A's accurate speed and torque regulation.  Material Handling: Conveyors, cranes, and elevators can leverage its precise control for smooth acceleration, deceleration, and precise positioning.  HVAC and Pumping Systems: In building automation and water management, the VFD efficiently controls pumps and fans, optimizing energy consumption and providing stable operation.  Specialized Machinery: Applications requiring dynamic response, such as those involving winding equipment or shearing machinery, are well-suited for the GD350A's advanced capabilities.

The dual-duty rating (Normal Duty/Heavy Duty) further expands its application flexibility, allowing for optimized performance and cost-effectiveness in various load scenarios.

Practical System Integration Guidance

Integrating the INVT GD350A-3000G-4 into an existing system is facilitated by its thoughtful design and extensive connectivity options. For electrical connections, adhere strictly to the main circuit and control circuit wiring diagrams provided in the user manual to ensure safety and proper functionality. The VFD supports multiple mainstream communication protocols through optional expansion cards, including Ethernet/IP, PROFINET, and EtherCAT, enabling seamless integration with various PLCs and industrial networks. For commissioning, the auto-tuning function, which performs one-key motor parameter auto-tuning and loop parameter self-adaptation, significantly simplifies setup and can lead to commissioning-free startup. Furthermore, the multi-line, multi-language LCD control panel offers intuitive operation and simplifies parameter configuration without requiring extensive manual consultation. For advanced customization, the programmable expansion card supports ladder diagram and sequential function chart programming, enabling secondary development directly within the VFD.

Operation and Risk Mitigation

Safe and efficient operation of the INVT GD350A-3000G-4 is supported by a comprehensive set of features designed to mitigate risks. The integrated Safe Torque Off (STO) function, compliant with SIL2 safety levels, provides a reliable method for safely shutting down motor torque, crucial for emergency stops and maintenance procedures. The drive also boasts over 30 protection functions, including overcurrent, overvoltage, undervoltage, phase loss, overheating, and short circuit protection, safeguarding both the VFD and the connected motor. For troubleshooting, the unit provides detailed error codes that can help diagnose issues, such as "OC1" for overcurrent during acceleration or "SPO" for output phase loss. Regular maintenance, as outlined in the operation manual, along with careful adherence to safety guidelines during installation and operation, will maximize the VFD's lifespan and prevent operational failures.

Scalability & Long-Term Value

The INVT GD350A-3000G-4 is designed for future-proofing and long-term industrial value through its inherent scalability and compatibility with evolving automation technologies. Its architecture supports the installation of up to three expansion cards simultaneously, allowing for the addition of communication cards (e.g., for EtherNet/IP, PROFINET), I/O cards, or encoder feedback (PG) cards. This modularity ensures that the VFD can adapt to changing system requirements and integrate new communication standards as they emerge. Moreover, the GD350A series is IoT-ready, supporting remote monitoring and diagnostics through mobile apps (via optional Bluetooth/Wi-Fi modules) and PC-based software like INVT Workshop. This connectivity facilitates predictive maintenance, real-time performance analysis, and integration into Industrial Internet of Things (IIoT) platforms, delivering significant long-term operational and economic benefits. The capability for secondary development also allows for custom application logic, further enhancing its adaptability and value over time.

Frequently Asked Questions

  What types of motors can the INVT GD350A-3000G-4 control?

    The INVT GD350A-3000G-4 is highly versatile, capable of controlling multiple motor types. It supports standard asynchronous motors and permanent magnet synchronous motors (PMSM). With customized software, it can also effectively manage synchronous reluctance motors. This broad compatibility ensures it can be integrated with a wide array of existing and new motor installations.

  What are the key advantages of the GD350A series over older models?

    The GD350A series benefits from INVT's most advanced processing units and leading vector control technology. Compared to previous generations, it offers more precise and flexible motor control, enhanced scalability, and improved usability features. It also integrates advanced functions like Safe Torque Off (STO) at SIL2 and supports IoT connectivity for remote monitoring and diagnostics.

  How does the GD350A-3000G-4 ensure operational safety?

    Safety is a paramount concern for the GD350A-3000G-4. It features a built-in Safe Torque Off (STO) function that meets SIL2 safety integrity level standards, providing a reliable method for preventing unexpected motor movement. Additionally, the VFD incorporates over 30 comprehensive protection functions, including overcurrent, overvoltage, phase loss, and thermal overload protection, to safeguard personnel and equipment.

  What communication protocols are supported by the GD350A-3000G-4?

    The drive comes standard with RS485 communication (Modbus RTU). For advanced integration, it supports a wide array of optional communication expansion cards. These include protocols like PROFINET, CANOPEN, PROFIBUS-DP, Ethernet/IP, Modbus TCP, and EtherCAT, allowing for seamless connectivity with most industrial automation systems and networks.

  Can the GD350A-3000G-4 be used in harsh environmental conditions?

    Yes, the GD350A series is designed for industrial environments. It features robust EMC design to minimize noise and interference and can withstand challenging grid conditions, temperature variations, humidity, and dust, enhancing its reliability in demanding settings.

  What is the benefit of the dual-duty rating on the GD350A-3000G-4?

    The dual-duty rating, often distinguishing between Normal Duty (constant torque) and Heavy Duty (variable torque, e.g., pumps and fans), allows for more flexible application and potential cost savings. It means a single VFD can often be used for a motor with a higher power rating in variable torque applications compared to constant torque applications, optimizing component selection.

  How does the GD350A-3000G-4 facilitate remote operation and monitoring?

    The GD350A-3000G-4 supports IoT functionality. With optional Bluetooth or Wi-Fi communication cards, users can connect via a mobile app ("INVT Workshop") or PC software for remote configuration, monitoring, and diagnostics. This enables convenient operation and troubleshooting without direct physical access to the drive.

  What is the auto-tuning function, and why is it important for installation?

    The auto-tuning function performs a one-key motor parameter self-learning process. This is crucial for optimizing the VFD's performance with the connected motor. It ensures accurate speed and torque control, reduces energy waste, and can significantly simplify the commissioning process, often leading to a "commissioning-free startup" in many applications.

  Can the GD350A-3000G-4 be programmed for custom applications?

    Absolutely. The GD350A-3000G-4 supports secondary development through optional programmable expansion cards. These cards allow users to write custom application logic, such as ladder diagrams, enabling the VFD to perform complex control tasks and act as a standalone controller, reducing the need for external PLCs.

  What are some common fault codes for INVT drives, and what do they indicate?

    Common fault codes include "OC" (Overcurrent) variants like OC1 (acceleration), OC2 (deceleration), and OC3 (constant speed). "OV" (Overvoltage) variants like OV1, OV2, OV3 also exist. Other critical codes include "SPO" (Output Phase Loss), "OH1/OH2" (Heatsink/IGBT Overheat), and "SPI" (Input Phase Loss), all indicating specific operational anomalies requiring attention and potential troubleshooting.