INVT GD350A-075G/090P-4 Fan & Pump Drive VFD

The INVT GD350A-075G/090P-4 is a high-performance Variable Frequency Drive (VFD) engineered for demanding fan and pump applications, offering robust control, energy efficiency, and advanced features. This drive excels with its 75kW (090P designation typically indicates a frame size or specific configuration) power rating, advanced sensorless vector control, and integrated communication protocols, making it a superior choice for optimizing HVAC systems, water treatment plants, and industrial fluid handling. Key advantages include precise speed regulation, soft-start capabilities to reduce mechanical stress, and a user-friendly interface for straightforward setup and monitoring.

Product Specifications

| Parameter          | Value                                      |

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

| Model              | GD350A-075G/090P-4                         |

| Rated Power        | 75 kW                                      |

| Input Voltage      | 3-Phase 380V/400V/415V AC (45-66 Hz)         |

| Output Voltage     | 0-Rated Input Voltage AC                   |

| Rated Output Current | 150 A (for 075G model)                     |

| Overload Capacity  | 150% of rated current for 60 sec           |

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

| Frequency Range    | 0-300 Hz                                   |

| Protection Features | Overvoltage, undervoltage, overload, etc. |

| Communication      | RS485 (Modbus) built-in                   |

| Operating Temp.    | -10°C to +40°C (derate above +40°C)        |

Core Features & Market Positioning

The INVT GD350A-075G/090P-4 distinguishes itself through its advanced sensorless vector control algorithm, providing exceptional torque accuracy and dynamic response without the need for motor encoders. This technology significantly simplifies installation and maintenance while ensuring precise process control, a critical advantage in applications like variable speed pumping and air handling. Its robust design, featuring a high-quality heatsink and advanced thermal management, ensures reliable operation even in harsh industrial environments. Positioned as a cost-effective yet feature-rich solution, it competes strongly against other leading VFD manufacturers by offering a compelling balance of performance, durability, and ease of use for HVAC and water management professionals.

Key Application Scenarios

This VFD is ideally suited for variable air volume (VAV) systems in commercial buildings, where precise airflow control is essential for comfort and energy savings. In water supply and drainage systems, the GD350A-075G/090P-4 enables constant pressure control, eliminating water hammer and reducing energy consumption by matching pump speed to demand. It is also widely deployed in industrial process control, such as in cooling towers, ventilation systems for mines, and irrigation projects, where variable speed operation is key to optimizing performance and resource utilization.

Practical System Integration Guidance

Integrating the INVT GD350A-075G/090P-4 into existing systems is streamlined by its flexible I/O configuration and standard RS485 Modbus communication port. For wiring, ensure compliance with local electrical codes; connect the incoming power supply to the L1, L2, L3 terminals and the motor leads to T1, T2, T3. The drive supports multiple control modes, including external terminals for start/stop and speed reference signals, or digital communication for advanced parameter settings and monitoring. Basic commissioning involves setting motor parameters (e.g., rated voltage, current, frequency) and selecting the appropriate control mode. Referencing the user manual for specific programming examples for PID control or multi-step speed settings is recommended.

Operation and Risk Mitigation

Safe operation of the INVT GD350A-075G/090P-4 mandates adherence to electrical safety standards and proper grounding. Always disconnect power before performing any wiring or maintenance. Common operational issues can often be resolved by reviewing the drive's fault code display; for example, an "Overcurrent Fault" (often code F001) might indicate rapid acceleration, excessive load, or motor issues. Implementing soft-start and soft-stop functions, along with appropriate current limiting parameters, can effectively mitigate mechanical stress and prevent overcurrent trips during normal operation. Ensure adequate ventilation around the drive to prevent overheating.

Scalability & Long-Term Value

The INVT GD350A-075G/090P-4 offers excellent scalability, easily integrating into larger automation systems via its built-in Modbus communication capabilities. This allows for centralized control and monitoring within SCADA or Building Management Systems (BMS), supporting the adoption of Industry 4.0 principles. Its robust construction and comprehensive protection features contribute to a long operational lifespan, minimizing downtime and maintenance costs. For future upgrades, INVT's product roadmap often includes software updates and compatible accessories, ensuring continued relevance and performance enhancement.

Frequently Asked Questions

Q1: What are the primary benefits of using the INVT GD350A-075G/090P-4 for fan applications?

This drive offers precise speed control for optimal airflow management. It reduces energy consumption by matching fan speed to system demand. The soft-start feature also minimizes mechanical wear on the fan and motor.

The GD350A-075G/090P-4 provides excellent sensorless vector control for accurate speed regulation. This ensures consistent performance without an encoder. It also features built-in PID control for closed-loop airflow management.

Its advanced thermal management ensures reliable operation in diverse HVAC environments. The drive's robust design minimizes maintenance needs and prolongs equipment life.

Q2: How does the GD350A-075G/090P-4 handle pump control and energy efficiency?

The drive enables precise pressure control in pumping systems. It adapts pump speed to maintain a constant setpoint efficiently. This minimizes energy usage significantly.

It prevents water hammer effects by gradually adjusting pump speed. This protects piping and system components from surges. The VFD also offers sleep mode functionality for further energy savings.

The GD350A-075G/090P-4’s sensorless vector control ensures optimal torque delivery. This results in efficient operation across a wide speed range. It's ideal for variable speed drive applications.

Q3: What are the key technical specifications to consider for this VFD?

The model GD350A-075G/090P-4 has a 75kW rated power. It operates on a 3-phase 380-415V AC input. The output current is up to 150A.

It supports sensorless vector control and V/f control methods. The frequency range extends from 0 to 300 Hz. Overload capacity is 150% for 60 seconds.

Key environmental specs include an operating temperature range of -10°C to +40°C. It also features built-in RS485 Modbus communication.

Q4: Can the INVT GD350A-075G/090P-4 be integrated with existing industrial control systems?

Yes, it integrates seamlessly via its RS485 Modbus communication port. This allows for easy connection to SCADA or PLC systems. It supports standard industrial protocols.

The drive offers flexible I/O options for digital and analog signals. This allows for external control of speed, start/stop, and monitoring. It can be part of a distributed control architecture.

Its compatibility with common automation platforms makes it a versatile choice. This ensures easy implementation in upgraded or new automation projects.

Q5: What are common troubleshooting steps for the GD350A-075G/090P-4?

Check the drive's display for specific fault codes. Refer to the user manual for code meanings and solutions. Common issues include overcurrent or overvoltage faults.

Ensure proper wiring and grounding connections are secure. Verify motor parameters are correctly set within the drive. Incorrect settings can lead to operational errors.

Perform basic diagnostics like checking input power and motor connections. Ensure the ambient temperature is within the specified operating range.

Q6: What is the typical installation process for this VFD?

Mount the drive vertically in a well-ventilated area, away from dust and moisture. Ensure sufficient clearance around the unit for cooling. Securely fasten it to a stable surface.

Connect the input power supply and motor cables according to the wiring diagram. Ensure proper grounding of both the drive and the motor. Use appropriate cable glands and conduits.

Perform initial parameter setup based on motor nameplate data and application requirements. Conduct a low-speed test run before enabling full operational speed.

Q7: What safety precautions should be observed when working with this VFD?

Always disconnect all power sources before performing any installation or maintenance. Ensure the drive is properly grounded to prevent electrical hazards. Use appropriate personal protective equipment (PPE).

Follow lockout/tagout procedures during maintenance. Be aware of stored energy in capacitors even after power is removed. Consult the user manual for detailed safety guidelines.

Avoid operating the drive in excessively dusty or humid environments. Ensure proper ventilation to prevent overheating, which can be a safety risk.

Q8: How does the GD350A-075G/090P-4 handle overload conditions?

The drive can withstand 150% of its rated current for 60 seconds. This provides robustness for temporary load surges. It protects the motor and drive from damage.

When an overload condition persists, the VFD will trigger an overcurrent fault. This safely shuts down the motor before damage occurs. The specific fault code will indicate the type of overload.

Users can adjust overload protection parameters within the drive's settings. This allows for customization based on specific application needs and motor characteristics.

Q9: What are the advantages of sensorless vector control in this VFD?

Sensorless vector control offers precise speed and torque regulation without needing an encoder. This simplifies installation and reduces costs. It provides excellent dynamic response.

It ensures high accuracy across a wide speed range, even at low speeds. This is critical for applications requiring tight process control. The drive can maintain steady performance under varying loads.

This control method enhances overall system efficiency. It allows the motor to operate at optimal performance points. It’s a key feature for advanced motor control.

Q10: Where can I find the user manual and technical documentation for the INVT GD350A-075G/090P-4?

The official INVT website is the primary source for user manuals. Search their support or download section for the GD350A series. Ensure you download the correct manual for your specific model.

Authorized INVT distributors and partners often provide access to technical documentation. They can also offer support and guidance on product selection and application. Check their websites or contact their sales teams.

Product datasheets and application notes are also available through online industrial equipment marketplaces. These resources can offer supplementary information beyond the core manual.