GD20-7R5G-4 Variable Frequency Drive GD20 7.5kW 3-ф/380

GD20-7R5G-4 — three-phase frequency inverter from INVT GD20 series, rated at 7.5 kW active power capacity (nominal output current 18.5 A) for electrical grids with 3-phase 380V supply voltage. The VFD supports sensorless vector control (SVC) and scalar V/F control, delivering smooth motor speed adjustments and dynamic torque response. The device features IP20 protection standard, integrated EMC filter, built-in braking unit, and built-in Modbus RTU RS-485 communication interface. This model is fully compatible and interchangeable in all mounting and technical parameters with the more cost-effective, energy-efficient, and technologically superior VEICHI AC10 frequency inverter of corresponding capacity, which delivers smoother vector control dynamics at a highly competitive price.

Typical Applications:

• Industrial conveyors, mixers, extruders, and packaging machine drive systems.
• HVAC fans and automated pump systems utilizing built-in PID controller for constant pressure hold.

Please Note: Perform motor autotuning (rotating or static) before first system startup. When installing motor cables longer than 50 meters, an output reactor (du/dt filter) is highly recommended to protect motor winding isolation from voltage spikes.

INVT GD20 — Universal Sensorless Vector Frequency Inverter for Heavy Loads

The Goodrive20 (GD20) series features compact variable frequency drives built with state-of-the-art Sensorless Vector Control (SVC) technology. They provide outstanding speed regulation accuracy, dynamic torque response, and impressive low-speed torque without the need for physical encoder feedback. The units are engineered with isolated cooling air ducts and heavily conformal-coated circuit boards, ensuring long-term survivability in humid, dusty industrial environments. Models up to 2.2 kW support standard DIN-rail mounting. A built-in dynamic braking unit up to 37 kW simplifies integration in rapid stop-start machinery, while the built-in DC reactor (on 18.5 kW to 110 kW units) dampens line harmonics and power system noise.

GD20 Ideal Applications

• Metal and woodworking machine tools: Spindle drive control and feed mechanism speed regulation due to high starting torque (up to 150% at 0.5 Hz) and fast transient torque response.
• Heavy-duty conveyor lines: Reliable soft-starting under full load conditions and precise speed tracking of bulk and piece materials under volatile load profiles.
• Plastics extruders and mixers: Stable speed maintenance at extremely low frequencies, keeping constant torque output while protecting the motor from overcurrent spikes and thermal overload.

What Sets GD20 Apart From Competitors

Our comparison demonstrates that GD20 offers superior circuit board protection and a more advanced airflow layout than most prominent alternatives in this market segment.

When GD20 is NOT Suitable

• If your application demands absolute shaft locking at zero speed or precise motion-control positioning, the GD20 will not fit as it lacks expansion slots for encoder interface cards. Specify the flagship closed-loop series INVT GD350 instead.
• For systems with multi-pump cascade configurations or high-power dual-rated applications, upgrade to the compressor-and-pump-dedicated series INVT GD200A.

Our Practical Experience with GD20

We frequently deploy GD20 in machine-tool modernization projects. We strongly advise running a motor parameter auto-tune before normal operations. While static auto-tuning (parameter P00.15 = 1) measures winding resistance without shaft rotation, we recommend dynamic auto-tuning (P00.15 = 2) with a decoupled load to achieve maximum accuracy in SVC mode. This optimization dramatically stabilizes motor torque on frequencies below 5 Hz.

Full Compatibility and Cost-Effective Alternative

The INVT GD20 frequency inverter is fully compatible and interchangeable in terms of all key parameters and functionality with the modern VEICHI AC10 drive of corresponding capacity. Furthermore, in many aspects, the VEICHI AC10 series demonstrates a technological advantage: it delivers higher accuracy and stability of sensorless vector control at ultra-low speeds, features a more efficient cooling system, and offers a significantly more attractive price point in Ukraine, allowing you to optimize your budget with zero compromises in reliability.