INVT GD350A-220G/250P-4 Fan & Pump Inverter VFD

The INVT GD350A-220G/250P-4 Fan & Pump Inverter VFD represents a sophisticated solution for variable speed drive applications within the HVAC and water management sectors. Engineered for efficiency and reliability, this Variable Frequency Drive (VFD) offers precise control over fan and pump operations, leading to significant energy savings and optimized system performance. Key advantages include its advanced vector control algorithms, robust protection features, and user-friendly interface. The core technical specifications highlight its power output capabilities, ranging from 2.2 kW (220G) to 2.5 HP (250P), operating on a 220V input voltage with a 3-phase output, making it suitable for a wide array of industrial and commercial installations. Its compact design and integrated features simplify integration and maintenance, solidifying its position as a leading choice for demanding applications.

Product Specifications

| Feature             | Specification                                 |

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

| Model               | GD350A-220G/250P-4                            |

| Input Voltage       | 220V (Single Phase / Three Phase)             |

| Output Voltage      | 220V (Three Phase)                            |

| Rated Power (kW/HP) | 2.2 kW / 3 HP (220G), 2.5 HP / 1.85 kW (250P) |

| Frequency Range     | 0-600 Hz                                      |

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

| Overload Capacity   | 150% for 60s, 120% for 120s                     |

| Protection Features | Over-voltage, Under-voltage, Over-current, etc. |

| Dimensions (mm)     | Varies by model (refer to datasheet)          |

| Ambient Temp.       | -10°C to 40°C                                 |

Core Features & Market Positioning

The INVT GD350A-220G/250P-4 distinguishes itself through its advanced sensorless vector control, which provides superior torque accuracy and dynamic response even without motor encoders, a critical advantage in fan and pump applications where precise speed regulation is paramount. This VFD is designed with a focus on energy efficiency, employing intelligent power modules and optimized algorithms to minimize energy consumption, a key selling point for cost-conscious industries. Its robust construction and comprehensive suite of protection functions, including over-voltage, under-voltage, over-current, and thermal protection, ensure reliable operation and extend the lifespan of connected equipment. Market positioning emphasizes its high performance-to-cost ratio, making it an attractive option for both new installations and upgrades where budget and reliability are equally important.

Key Application Scenarios

This VFD excels in a variety of fan and pump applications, particularly in building automation systems where precise environmental control is essential. It is widely used for constant pressure water supply systems, managing pump speed to maintain a steady flow and pressure without frequent on/off cycling, thereby enhancing comfort and reducing wear on pump components. In HVAC systems, the INVT GD350A-220G/250P-4 is instrumental in controlling fan speeds for ventilation, air conditioning, and heating, automatically adjusting airflow based on demand to optimize energy usage and maintain desired temperature and humidity levels. Its robust design also makes it suitable for industrial process applications requiring variable speed control of pumps and fans in manufacturing, chemical processing, and other demanding environments.

Practical System Integration Guidance

Integrating the INVT GD350A-220G/250P-4 into existing systems is facilitated by its flexible input power options and standard mounting configurations. For optimal performance, ensure proper wiring practices are followed, connecting the input power to L1/L2/L3 terminals and the motor to T1/T2/T3. The drive's internal parameters can be accessed and configured via the intuitive keypad or through optional communication modules, allowing for fine-tuning of motor characteristics, acceleration/deceleration ramps, and specific protection thresholds. For pump applications, setting up the built-in PID controller is crucial for maintaining a target pressure or flow rate, often involving configuration of analog input signals from pressure transducers. Similarly, for fan applications, adjusting the V/f curve or utilizing sensorless vector control parameters ensures optimal motor efficiency and responsiveness.

Operation and Risk Mitigation

Safe operation of the INVT GD350A-220G/250P-4 VFD requires adherence to electrical safety standards and proper installation procedures. Always ensure the power supply is disconnected before performing any wiring or maintenance. Key operational risks are mitigated through the VFD's extensive fault diagnosis capabilities. Common error codes, such as 'OC' (Over-Current) or 'OV' (Over-Voltage), typically indicate issues with motor load, wiring, or supply stability, prompting specific troubleshooting steps outlined in the user manual. Regular inspection of motor and VFD connections, along with monitoring operating temperatures, helps prevent premature failure. Understanding the specific fault codes and their associated causes is critical for prompt resolution and minimizing downtime.

Scalability & Long-Term Value

The INVT GD350A-220G/250P-4 offers good scalability, allowing for integration into larger automation systems through its optional communication interface modules, supporting protocols like Modbus, Profibus, and Ethernet/IP. This compatibility ensures that the VFD can be seamlessly incorporated into modern Industrial Internet of Things (IIoT) platforms, enabling remote monitoring, diagnostics, and data analysis for predictive maintenance and operational optimization. The drive's modular design and firmware upgrade capabilities also contribute to its long-term value, allowing for future enhancements and adaptation to evolving industry standards. By precisely controlling motor speed, it significantly reduces energy consumption, leading to substantial operational cost savings over the product's lifecycle.

Frequently Asked Questions

1. What are the primary benefits of using the INVT GD350A-220G/250P-4 VFD for pumps?

This VFD offers precise speed control, leading to significant energy savings by matching pump output to system demand. It also reduces mechanical stress on pumps through soft starting and stopping.

The drive's advanced PID control allows for constant pressure or flow, enhancing system stability and user comfort. It minimizes wear and tear on pump components, extending equipment lifespan.

Furthermore, the INVT GD350A-220G/250P-4 provides robust motor and system protection, preventing damage from over-voltage, over-current, and other electrical anomalies.

2. How does the sensorless vector control of the GD350A-220G/250P-4 improve fan performance?

Sensorless vector control provides accurate torque and speed regulation without requiring a motor encoder, simplifying installation. This enhances the VFD's responsiveness to changing air volume demands.

This technology ensures smooth operation and consistent airflow, even under varying load conditions, optimizing HVAC system efficiency. It also allows for precise fan speed adjustments for better climate control.

The GD350A-220G/250P-4's advanced control algorithm minimizes energy consumption by efficiently managing fan speeds according to real-time requirements. This translates to lower operating costs.

3. What are the typical installation requirements for the INVT GD350A-220G/250P-4?

Ensure the VFD is installed in a clean, dry environment with adequate ventilation to prevent overheating. Proper grounding of both the VFD and the motor is essential for safety and performance.

Follow the wiring diagrams in the manual precisely for input power, motor connections, and any control signals or communication interfaces. Use appropriately sized cables for the rated current.

Consider installing electromagnetic interference (EMI) filters and output reactors if the motor is located far from the VFD or in environments with high electrical noise to ensure optimal signal integrity.

4. Can the INVT GD350A-220G/250P-4 be used with any type of 3-phase motor?

Yes, the GD350A-220G/250P-4 is designed to control standard 3-phase induction motors commonly used in fan and pump applications. Proper motor parameter configuration within the VFD is key.

Always verify that the motor's voltage, current, and frequency ratings are compatible with the VFD's output capabilities and the specific model being used. Consult the motor's nameplate.

For older or specialized motors, it's advisable to consult the VFD manufacturer's application support or review the VFD's parameter settings for optimal compatibility and performance.

5. What kind of protection features does this VFD offer against electrical faults?

The GD350A-220G/250P-4 includes comprehensive protection against over-voltage, under-voltage, and over-current conditions. It also features motor overload and instantaneous over-current protection.

Thermal protection for the VFD itself and the connected motor is integrated, preventing damage due to overheating. It also protects against short circuits and ground faults.

Additional safety features include phase loss protection for both input and output, preventing operation if a phase is missing, and excessive start-up surge protection.

6. How do I adjust the speed of a pump controlled by the INVT GD350A-220G/250P-4?

Speed can be adjusted using the VFD's built-in keypad for manual control or via programmed ramp speeds. For automatic control, analog input signals from a pressure sensor are commonly used.

When using the keypad, navigate to the speed reference parameter and enter the desired frequency value within the VFD's operating range. Ensure the VFD is in the correct operating mode.

For applications requiring automatic adjustment, configure the analog input module to accept a 0-10V or 4-20mA signal from a pressure transducer, linking it to the desired output speed.

7. Is it possible to connect multiple INVT GD350A-220G/250P-4 VFDs together for a larger system?

While individual VFDs control separate motors, complex multi-pump systems often use a single VFD with mechanical or electrical bypass for redundancy or multiple VFDs managed by a central PLC.

Directly connecting multiple VFDs in series or parallel for a single motor is not supported and can lead to damage. They are typically used to control individual units within a larger networked system.

Integration into larger systems is usually achieved via communication protocols like Modbus, allowing a PLC or central controller to manage and monitor multiple VFDs independently.

8. What is the typical lifespan of an INVT GD350A-220G/250P-4 VFD?

The lifespan of the GD350A-220G/250P-4 VFD depends heavily on the operating environment, duty cycle, and maintenance practices. Typically, with proper installation and care, they can last 10-15 years.

Key components like cooling fans and electrolytic capacitors have a finite life and may require periodic replacement, especially in demanding or high-temperature applications. Regular servicing prolongs life.

Adhering to the specified ambient temperature range, avoiding excessive dust or moisture, and performing routine checks can significantly contribute to maximizing the operational longevity of the VFD.

9. How can I troubleshoot common errors like "OC" or "OV" on the GD350A-220G/250P-4?

An "OC" (Over-Current) error usually indicates that the motor is drawing too much current, possibly due to a mechanical overload, incorrect motor parameters, or a short circuit. Check the load and motor settings.

An "OV" (Over-Voltage) error suggests the input voltage is too high or the deceleration ramp is too short, causing regenerative energy to spike the DC bus voltage. Check supply voltage and deceleration time.

Refer to the product manual for specific troubleshooting steps for each error code. These often involve checking wiring, adjusting parameters like acceleration/deceleration times, and verifying motor compatibility.

10. Does the INVT GD350A-220G/250P-4 support communication protocols for IIoT integration?

Yes, the GD350A-220G/250P-4 supports various communication protocols through optional expansion cards. Modbus RTU is commonly supported for basic integration.

Advanced protocols like Profibus, DeviceNet, or Ethernet/IP can often be integrated with the appropriate communication modules, enabling seamless connection to SCADA systems and IIoT platforms.

This connectivity allows for remote monitoring of operational status, energy consumption, fault diagnostics, and real-time control adjustments, facilitating smart manufacturing and predictive maintenance strategies.