INVT GD350A-400G/450P-4 Special Fan & Pump VFD Drive

The INVT GD350A-400G/450P-4 is a specialized Variable Frequency Drive (VFD) engineered for demanding fan and pump applications. This drive offers exceptional energy efficiency, precise motor control, and robust protection features, making it a superior choice for optimizing HVAC systems, water supply networks, and industrial ventilation. Key advantages include its high overload capacity, advanced control algorithms for smooth operation, and comprehensive communication options. Technical specifications highlight a 3-phase input/output, a power rating of 400G/450P-4 (referring to specific frame sizes and power configurations), and a wide operating voltage range.

Product Specifications

| Feature           | Specification                                      |

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

| Model             | GD350A-400G/450P-4                                 |

| Input Voltage     | 3-Phase, 380V-460V AC                              |

| Output Voltage    | 3-Phase, 0-460V AC                                 |

| Rated Power (kW)  | Varies by specific model variant (e.g., 400G, 450P) |

| Frequency Range   | 0-400 Hz                                           |

| Control Method    | Sensorless Vector Control, V/f Control             |

| Overload Capacity | 150% for 60 seconds, 180% for 3 seconds            |

| Protection        | Overcurrent, Overvoltage, Undervoltage, Overtemp, etc. |

| Communication     | RS485 (Modbus), Optional fieldbuses              |

Core Features & Market Positioning

The INVT GD350A-400G/450P-4 distinguishes itself through its sophisticated sensorless vector control, enabling superior torque response and precise speed regulation even under fluctuating load conditions, a critical advantage in pump and fan applications where flow and pressure demand varies. Its dual operating modes, V/f and vector control, provide flexibility for different motor types and system requirements. The drive's robust design, including high overload capability, ensures reliable operation in harsh industrial environments and during transient load surges. Furthermore, its integrated PID controller simplifies closed-loop system management for pressure or flow control, reducing the need for external control devices and enhancing system integration. This positions the GD350A series as a cost-effective and high-performance solution for applications demanding efficiency and reliability.

Key Application Scenarios

This VFD is ideally suited for a broad spectrum of fan and pump applications. In building automation, it excels in HVAC systems, controlling fans for air handling units and pumps for chilled/hot water circulation, leading to significant energy savings by matching motor speed to actual demand. For municipal water supply, the INVT GD350A-400G/450P-4 optimizes the performance of centrifugal pumps, maintaining constant pressure and reducing wear on equipment. Industrial sectors benefit from its use in process cooling systems, ventilation in manufacturing plants, and managing effluent pumps, where precise flow control and energy efficiency are paramount. The drive's ability to handle dusty and humid environments further broadens its applicability in sectors like mining and wastewater treatment.

Practical System Integration Guidance

Integrating the INVT GD350A-400G/450P-4 into existing systems is streamlined due to its flexible configuration options. For wiring, ensure compliance with local electrical codes, connecting the incoming power to the L1, L2, L3 terminals and the motor to T1, T2, T3. Grounding is essential for safety and optimal performance. Commissioning typically involves setting basic parameters such as motor nameplate data (voltage, frequency, current, speed) and selecting the appropriate control mode (V/f or vector). For PID control loops, configure the feedback input (e.g., analog input for pressure transducer) and set the target setpoint, proportional gain (P), integral time (I), and derivative time (D) for stable and accurate regulation. The RS485 communication port facilitates integration with SCADA systems or PLCs using the Modbus RTU protocol, allowing for remote monitoring and control.

Operation and Risk Mitigation

Safe operation of the INVT GD350A-400G/450P-4 is paramount. Always ensure the drive is properly grounded and that all power sources are de-energized before performing any wiring or maintenance. During operation, monitor for common fault codes displayed on the drive's interface. For instance, an "OC" (Overcurrent) fault might indicate a motor issue or an excessively rapid acceleration setting. An "OV" (Overvoltage) fault could suggest regenerative braking is required or the input voltage is too high. An "OH" (Overtemperature) fault typically means the drive's heatsink is too hot, requiring improved ventilation or a reduced load. Refer to the product manual for a complete list of fault codes and their specific troubleshooting steps to mitigate operational risks and ensure longevity.

Scalability & Long-Term Value

The INVT GD350A-400G/450P-4 offers significant long-term value through its robust scalability and compatibility. Its modular design and support for various communication protocols, including optional fieldbus modules for Profibus, DeviceNet, and EtherNet/IP, ensure seamless integration into evolving Industrial Internet of Things (IIoT) architectures and existing automation platforms. This facilitates centralized monitoring, predictive maintenance, and advanced data analytics. The drive's firmware can often be updated, allowing for performance enhancements and new features to be added over time without requiring a hardware replacement. Its energy-saving capabilities, coupled with precise motor control that reduces mechanical stress, contribute to lower operating costs and extended equipment lifespan, providing a strong return on investment.

Frequently Asked Questions

1. What are the main benefits of using the INVT GD350A-400G/450P-4 for pump applications?

This VFD provides significant energy savings by precisely matching motor speed to water flow or pressure demands.

It extends pump lifespan through smooth acceleration/deceleration and reduced mechanical stress on components.

Advanced control features like PID enable constant pressure maintenance and optimized system performance.

2. How does the sensorless vector control of the GD350A-400G/450P-4 benefit fan operation?

Sensorless vector control ensures accurate speed regulation even with varying air loads or duct resistance.

It delivers excellent torque performance, allowing fans to start and operate smoothly under demanding conditions.

This mode optimizes energy consumption by minimizing power draw at partial loads.

3. What are the typical overload capabilities of this INVT drive?

The drive can typically handle 150% of its rated current for up to 60 seconds.

It also provides a higher overload capacity of 180% for short bursts of 3 seconds.

These capabilities are crucial for overcoming initial system inertia or transient load spikes in fans and pumps.

4. Can the INVT GD350A-400G/450P-4 be integrated into an existing SCADA system?

Yes, the drive features an RS485 communication port supporting the Modbus RTU protocol.

This allows for easy integration with PLCs and SCADA systems for remote monitoring and control.

Optional fieldbus modules can further expand connectivity to other industrial networks.

5. What are common troubleshooting steps for an "OC" fault on this VFD?

Check the motor for mechanical issues like bearing seizure or impeller obstruction.

Verify that the acceleration time parameter is not set too aggressively.

Ensure the motor and drive are correctly sized for the application load.

6. How do I set up PID control for maintaining constant pressure with the GD350A-400G/450P-4?

Connect a pressure transducer to the drive's analog input and configure the input type.

Set the desired pressure setpoint and tune the PID parameters (P, I, D) for stability.

Enable the PID function and select the appropriate feedback source within the drive's menu.

7. What is the input voltage range for the INVT GD350A-400G/450P-4?

The drive is designed for a 3-phase AC input voltage range of 380V to 460V.

This wide input voltage tolerance ensures compatibility with standard industrial power grids.

Always ensure the input voltage supplied matches the drive's specifications for safe operation.

8. How does the V/f control mode differ from sensorless vector control?

V/f control maintains a constant ratio between voltage and frequency to control motor speed.

Sensorless vector control offers superior torque accuracy and dynamic response without motor encoders.

V/f is simpler and suitable for basic fan/pump applications, while vector control excels in precision tasks.

9. What types of protection features are built into this INVT drive?

The drive includes comprehensive protection against overcurrent, overvoltage, and undervoltage conditions.

It also protects against motor and drive overtemperature, phase loss, and short circuits.

These integrated safety features safeguard both the VFD and the connected motor from damage.

10. Is firmware upgradeable on the GD350A-400G/450P-4 for future enhancements?

Yes, INVT typically provides firmware updates for their drives to improve performance and add features.

Consult the manufacturer's website or support for the latest firmware versions and upgrade procedures.

Keeping firmware updated ensures optimal functionality and access to new capabilities.