6EA…Q4C Four-Quadrant DC Drive – Regenerative Electrical Motor Control

In the demanding landscape of modern heavy industry—steel rolling mills, mining hoists, shipyard cranes, and large test benches—precise, robust, and energy-efficient electrical drives and control are non-negotiable. The 6EA…Q4C series Four-Quadrant DC Drive is engineered specifically for these high-power applications, delivering uncompromising performance, regenerative capability, and system reliability that sets a new benchmark in industrial motor control.

Engineered for High Power and Regenerative Efficiency

The 6EA…Q4C is a fully digital, compact, forced-air-cooled rectifier designed to supply both armature and field circuits of adjustable-speed DC motors. With an impressive armature current rating ranging from 600A to 4500A, and a field circuit capable of delivering up to 150A, it is built for the most strenuous tasks. Its true power is unlocked through parallel operation: up to six units can be connected in parallel to achieve a staggering total armature current of 20,000A.

At its core, this Regenerative Drive utilizes a dual three-phase fully-controlled bridge (B6)A/(B6)C configuration connected in a circulating-current-free anti-parallel arrangement. This sophisticated topology is what enables seamless four-quadrant operation, allowing the drive to not only motor in forward and reverse but also to regenerate energy back to the grid during braking and lowering operations—a critical feature for reducing energy costs and improving sustainability in cyclical processes.

To manage the immense thermal loads, the series offers three distinct heatsink structures tailored to different power segments: aluminum, heat-pipe, and copper, ensuring optimal thermal performance and long component life.

Integrated Intelligence with Industry-Leading Controllers

The 6EA…Q4C is not just a power converter; it’s a complete, integrated drive solution. It seamlessly incorporates either the renowned Siemens 6RA70/80 or the advanced ABB DCS800 control unit, along with its dedicated field excitation circuitry. This integration results in a highly modular design that saves valuable panel space and minimizes the need for external components.

The field supply itself is intelligently designed, using a 2-pulse single-phase semi-controlled bridge (B2HZ) for Siemens-based systems or a more robust 3-pulse three-phase semi-controlled bridge (B3HZ) for ABB-based systems, ensuring stable and efficient field control across the entire operating range.

Unmatched Flexibility and Robustness

Built for the global market, the 6EA…Q4C automatically adapts to mains frequency variations, operating reliably from 45Hz to 65Hz. With proper parameterization, its operational envelope can even be extended to an extraordinary 23Hz to 110Hz, making it suitable for specialized applications like aircraft ground support or marine power systems.

Its rugged enclosure boasts high structural integrity, an optimized internal layout for superior airflow, and a design that allows for rapid thyristor replacement—minimizing downtime. All components are sourced from premium imported or joint-venture brands, with generous derating to ensure the drive’s overload capacity exceeds that of comparable imported products.

Furthermore, the drive supports a Master-Slave configuration, enabling easy setup of 12-pulse rectification for reduced input harmonics or redundant drive schemes for mission-critical applications where uptime is paramount.

Advanced Control and Diagnostics for Peak Performance

The integrated control platform provides a suite of advanced features that define modern Electrical Motor Control:

• Exceptional Precision: Static speed accuracy of ±0.1% with encoder feedback and a dynamic speed drop equivalent of ≤0.25%S.
• Auto-Optimization: A powerful self-commissioning tool that automatically tunes key regulators—including armature current, speed, field current, and EMF during field weakening—and even measures motor friction, inertia, and magnetization curves. This drastically reduces commissioning time while guaranteeing optimal performance.
• Comprehensive Protection: A multi-layered protection system monitors for grid faults (phase loss, over/under-voltage, frequency), SCR/fuse/fan failures, drive overcurrent, motor I²t overload, tachometer issues, communication errors, and external faults.
• Connectivity: Equipped with a standard RS485 interface and support for multiple industrial network protocols for seamless integration into any automation architecture.

Every unit undergoes rigorous full-parameter, high-current testing before shipment, ensuring it will perform reliably for years in harsh industrial environments with ambient temperatures from 0°C to 45°C.

Technical Specifications Overview

The 6EA…Q4C series offers a comprehensive range of models to meet diverse application needs. Key specifications include a mains voltage tolerance of ±10% and a factory-preconfigured setup that simplifies startup.

Note: The full series includes many more models covering 440V, 660V, 750V, and 950V DC bus voltages with currents from 600A to 4500A.

Why Partner with HANI?

In the world of high-power electrical drives and control, choosing a supplier is a strategic decision. HANI combines decades of deep engineering expertise with state-of-the-art manufacturing. Our 6EA…Q4C series is produced on fully CNC-controlled equipment using standardized, advanced processes, guaranteeing consistent quality and reliability in every unit.

We don’t just sell a Four-Quadrant DC Drive; we deliver a complete solution backed by expert application support. From initial sizing and system design to commissioning and lifecycle service, HANI is your committed partner for achieving peak performance and maximum return on investment from your Regenerative Drive system.

Frequently Asked Questions (FAQ)

For engineers and plant managers seeking a high-power, regenerative, and future-proof solution for their most critical DC motor applications, the 6EA…Q4C series from HANI represents the pinnacle of electrical drives and control technology. Its blend of raw power, intelligent control, and exceptional reliability makes it the definitive choice for driving industrial success.