INVT GD350A 18.5 kW VFD | 400 V 3-Phase Inverter (Dual-Rating)

Description

INVT GD350A 18.5 kW VFD (400 V 3-Phase Dual-Rating) is engineered for precision control and efficiency in industrial automation. Offering high torque at low speeds and reliable performance under heavy-duty or normal-duty conditions, the GD350A 18.5 kW ensures stable operation for critical processes. With integrated PLC functionality, advanced motor protection, and Modbus/RS-485 communication, it simplifies commissioning and control.

Ideal for HVAC systems, water and wastewater pumps, compressors, conveyors, and general industrial machinery.

Key Specifications

• Power Rating: 18.5 kW (Normal Duty) / 15 kW (Heavy Duty)

• Rated Voltage: 3-Phase 400 V AC

• Control Modes: Advanced field-oriented control (FOC), constant current source mode for high torque at low speeds

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Exceptional Low-Speed Torque & Intelligent Motor Tuning

The GD350A 18.5 kW drive ensures stable torque even at low frequencies — essential for conveyors, pumps, and heavy machinery.
Its intelligent auto-tuning optimizes motor parameters for both asynchronous and synchronous types, minimizing harmonic distortion and improving precision across the entire speed range.

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Stability, Safety & Continuity

• Dynamic Voltage and Current Control: Adaptive algorithms prevent overvoltage or overcurrent faults during acceleration and deceleration.

• Integrated Safe Torque Off (STO): Immediate shutdown of motor torque to meet IEC 61800-5-2 (SIL 2 / PL d) safety standards.

• Uninterrupted Operation: Maintains operation during short power losses using stored DC-bus energy — critical for textile, plastics, and continuous-process applications.

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High Overload Capacity & Regenerative Braking

• Overload Endurance: Up to 150 % for 60 s, 180 % for 10 s, 200 % for 1 s.

• Multiple Braking Options: Dynamic, DC, flux, and short-circuit braking ensure smooth motor deceleration under varying load conditions.

• Built-in Regenerative Brake: Feeds energy back into the system, reducing installation effort and increasing efficiency.

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Precision Control & Low-Noise Operation

• Position Accuracy: ± 1 pulse

• Speed Control Accuracy: ± 0.2 % (SVC) / ± 0.02 % (VC)

• Starting Torque: 150 % at 0.25 Hz (asynchronous) / 200 % at 0 Hz (synchronous)

• Digital Noise Suppression: Advanced EMI filtering and signal isolation improve system reliability.

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Connectivity & Smart Integration

The INVT GD350A 18.5 kW offers flexible communication and monitoring:

• Standard: Modbus RTU (RS-485)

• Optional Modules: CAN, Profibus DP, Profinet, Ethernet

• Wireless Access: Optional Bluetooth or Wi-Fi for mobile diagnostics via the INVT Workshop App (range ≈ 30 m)

• Inputs / Outputs: 4 digital, 2 high-speed pulse, 2 analog inputs, analog + relay outputs

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Ease of Use & Expandability

• LCD Control Panel: Clear interface simplifies setup and real-time monitoring

• Integrated PLC: 128 kB program memory for custom automation logic

• Data Access: USB-based data logging and parameter transfer

• Modular Design: Three expansion slots for additional I/O, communication, or feedback cards

• PC & Remote Interfaces: USB-RS485, Ethernet, and UDP/MQTT cloud access for remote configuration

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Applications

The GD350A 18.5 kW variable-frequency drive provides energy-efficient control for:

• HVAC fans and compressors

• Industrial and wastewater pumps

• Conveyor belts and packaging lines

• Machine tools and processing systems

• Textile, printing, and food-processing equipment

• Renewable-energy and smart-factory installations

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See our full range of 400 V variable frequency drives, covering all power ratings from 0.75 to 500 kW.

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