GD350A-250G/280P-4 INVT GD350A-250G/280P-4 variable frequency drive, 250.0 kW, 480A, 3×380V, GD350 series

INVT GD350 — Intelligent Closed-Loop Vector Flagship Frequency Inverter

The Goodrive350 (GD350) is a cutting-edge flagship variable frequency drive from INVT, establishing new horizons for demanding automation architectures. The core physical advantage of the drive is its tremendous scalability: it is armed with three expansion slots capable of concurrently housing feedback PG cards (supporting incremental, absolute, and resolver encoders), high-speed fieldbus interfaces (Profinet, EtherCAT, Ethernet), and a built-in PLC card for secondary software engineering. GD350 supports full Closed-Loop Vector Control (VC), offering unmatched speed regulation accuracy (±0.02%) and transient torque response under 10 ms. Standard features include Safe Torque Off (STO SIL2), an onboard USB interface, and a built-in Bluetooth communication transceiver.

GD350 Ideal Applications

• Cranes, hoists, and heavy winches: Closed-loop operations with encoder feedback to lock active loads securely at zero speed, preventing mechanical brake wear and mechanical backlash.
• Complex web winding and tensioning lines: Exact material tension regulation in steel rolling mill systems and high-speed printing presses using strain gauges or real-time roll diameter calculations.
• CNC machining and high-speed spindles: Speed and position control of synchronous spindles with precise angular positioning and home orientation utilizing encoder index pulses.

What Sets GD350 Apart From Competitors

GD350 outperforms rivals due to its robust built-in Bluetooth wireless integration and massive expansion options, effectively eliminating the need for standalone external PLCs in complex applications.

When GD350 is NOT Suitable

• The drive system is over-engineered and financially prohibitive for standard municipal water pumps or common ventilation shafts where PG cards are unnecessary. Specify the dual-rated INVT GD200A instead.
• For domestic workshops or small-scale single-phase 220V machines requiring simple scalar speed limits, select the budget-friendly INVT GD10 series.

Our Practical Experience with GD350

Our automation engineers frequently commission the GD350 for steel wire winding lines. Getting closed-loop control right hinges on the precise setup of the parameters in group P20 (encoder constants) and group P21 (positioning loops). Running the initial rotor angle self-tuning parameter (P20.11) when commissioning permanent magnet synchronous motors (PMSM) with encoders prevents reverse startup rotation issues and streamlines physical onsite commissioning.