Eurotherm SDD590 Expanded Drive Unit – Upgrade Your Old 590 System
Brand name: HANI
Packing Details : Wooden box with fumigation or Wooden Fram or Steel Frame
Delivery Details: 30~60days or Based on the quantity
Shipping: Sea freight、Land freight、Air freight
HANI specializes in industrial electrical automation, delivering integrated drive and control solutions to safeguard your production.
Product Details
Eurotherm SDD590 Expanded Drive Unit – Upgrade Your Old 590 System
Modernize legacy DC drive installations without replacing the entire cubicle – engineered expansion for enduring industrial performance.
System Design Continuity and the Case for Electrical Drives and Control Modernization
Across industries that rely on legacy Eurotherm 590/590P series DC drives, the challenge is consistent: original power sections age, yet the control infrastructure, field wiring, and application-specific parameter sets remain perfectly serviceable. The Eurotherm SDD590 Expanded Drive meets this exact scenario. It is not a separate converter, but a factory-engineered expansion module designed to integrate directly with existing 590P control stacks, giving users a straightforward retrofit path that preserves decades of process tuning. In any high-availability electrical drives and control environment, this approach minimizes engineering risk while extending system life by another 15 to 20 years.
Unlike broad-range replacement drives that force a complete re-commissioning cycle, the SDD590 expansion leverages the original 16-bit microcontroller-based regulation platform. All complex control algorithms – those that simple analog techniques can never replicate – remain untouched. The expansion unit adds fully coordinated power semiconductor stages (full-controlled thyristor bridges) and reinforced auxiliary supplies, so the characteristics of the electrical drives and control loop, including armature feedback linearity and field economizer regimes, are retained without modification.
Core Architecture: How the Eurotherm SDD590 Expanded Drive Fits into Existing Control Schemes
The original 590P range was conceived for panel mounting inside appropriate electrical enclosures, using a simple latch-and-plug arrangement. The SDD590 expansion continues that philosophy. Insertable control connectors simplify both installation and removal of the power unit without disturbing the delicate signal harnesses that are typical of multi-drive electrical drives and control cabinets. This is especially valuable when an upgrade is carried out during a scheduled outage: the core control board, which is identical across all horsepower ratings, stays in place, while the expanded power block slides onto the same back-plane bus.
From a scientific perspective, the control circuit is fully galvanically isolated from the power circuit. This isolation is fundamental to reliable electrical drives and control systems because it simplifies cross-connections among multiple controllers in a single cabinet and directly raises operator safety. The phase-locked loop-based firing circuit automatically adapts to mains frequencies between 45 Hz and 65 Hz and inherently rejects phase rotation, so no manual strap changes are required when motors are re-commissioned after a retrofit.
Feedback Configurations and Protection Philosophy
Users can select between fully regenerative (four-quadrant) and non-regenerative (two-quadrant) expansion units, matching the original topology. A regenerative Eurotherm SDD590 Expanded Drive includes two fully controlled thyristor bridges for the armature plus a field bridge equipped with comprehensive instantaneous overload and surge protection. The electronic controller then provides acceleration/deceleration ramps and bidirectional speed or torque control. Non-regenerative versions contain a single armature bridge and identical field excitation stage, delivering precise speed and/or torque regulation in the chosen direction.
Overload protection relies on fast i²t algorithms embedded in the existing firmware, while the expansion unit adds independent di/dt snubber networks on each thyristor stack and enhanced gate drive transformers. This layered protection is critical for electrical drives and control applications in steel, aluminum, and mining, where intermittent overloads of 150% for 60 seconds are a normal operating condition.
| Parameter | SDD590 Expanded Drive – Armature | SDD590 Expanded Drive – Field |
|---|---|---|
| Nominal AC supply voltage | 3-phase, 200–690 V AC ±10%, 45–65 Hz | Single/three-phase available, internally derived |
| Expanded DC current range | Up to 3000 A (continuous), depending on bridge configuration | Up to 60 A, fully programmable |
| Overload capability | 150% for 60 s, 200% for 10 s (time-limited firmware profile) | 110% continuous, 150% for 30 s |
| Control interface | Same 590P control board connector set; RS422/RS485 serial link | Integrated into armature bridge logic |
| Protection features | Instantaneous overcurrent, phase-fail, heatsink over-temperature, snubber di/dt | Field loss, overvoltage clamp, short-circuit withstand |
| Cooling method | Forced air with temperature-controlled fan; optional redundant fan tray | Convection or force-cooled, depending on rating |
| Enclosure compatibility | Designed for standard Eurotherm 590 mechanical outline; direct bolt-in | Shares existing field exciter slot |
Communication and Control Integrity in Modern Electrical Drives and Control Systems
The original 590 series was among the first to embed a 16-bit microcontroller with software-configurable function blocks. This same platform, preserved by the SDD590 expansion, supports serial communication to supervisory PLCs, PCs, or other drives for coordinated process control. The retrofit therefore does not disturb the existing communication map – whether EI Bisynch, Modbus RTU, or Profibus DP options were originally fitted, they remain active after the upgrade. For a plant manager, this means the Eurotherm SDD590 Expanded Drive slots into the electrical drives and control architecture without any gateway or protocol converter.
Standard software modules for speed profiling, diameter calculator, tension control, and torque sharing remain untouched. The expansion unit’s auxiliary power supply incorporates enhanced ride-through, sustaining full logic operation during mains dips as short as 20 ms, a critical feature in continuous web processing electrical drives and control applications such as paper machines and coating lines.
Why a Retrofit Instead of Full Replacement? Five Production-Critical Factors
- Process parameter preservation: Years of accumulated PID tuning, inertia compensation, and resonance notch filters are validated intellectual property. An upgrade with the SDD590 keeps that investment.
- Mechanical fit: The expansion unit replicates the original footprint, weight distribution, and bus-bar positions, eliminating structural modifications to existing electrical drives and control cabinets.
- Reduced commissioning time: A full swap-out can require 5–7 days; a retrofit with the SDD590 is typically completed in one shift, including no-load verification.
- Spares commonality: Operators who have standardized on 590P spares can continue using existing control boards, fans, and fuse sets, avoiding dual inventory.
- Cost efficiency: Upgrading only the power block costs 35–50% less than a complete new drive system when engineering, rewiring, and learning curves are accounted for.
Industrial Scope – Where the Eurotherm SDD590 Expanded Drive Delivers Maximum Value
The expansion unit is specified across both greenfield sites and brownfield modernization projects where the core mission revolves around robust electrical drives and control. Typical sectors include:
| Industry Sector | Application Examples |
|---|---|
| Metals (steel, aluminum) | Rolling mills, coilers, uncoilers, slitting lines, multi-motor tandem systems |
| Pulp, paper & converting | Cross-cutters, sheeters, winders, sectional drive for paper machines |
| Plastics & rubber | Extruders, injection molding machines, internal mixers, calenders |
| Mining & cement | Mine winders, conveyors, crushers, ball mills |
| Cranes & hoists | Tower cranes, overhead traveling cranes, dock-side lifting systems |
| Oil & gas | Drawworks, mud pumps, top drives, thruster DC motor sets |
| Test benches & R&D | Dynamometer controllers, load emulators, multi-drive research rigs |
HANI specializes in delivering fully tested SDD590 expansion kits, pre-configured to match the original drive’s nameplate data and process application. By working with legacy electrical drives and control panels every day, our engineers ensure that the retrofit is a plug-and-play operation, often accompanied by remote diagnostic support during the first power-up.
Installation Considerations for Production Engineers
The SDD590 expanded drive unit is shipped with factory-fitted internal cabling, pre-tested gate firing sequences, and a matching field excitation transformer where applicable. Panel mounting follows the same simple latch principle used on the original 590P series, which drastically reduces changeover time. Insertable control connectors guarantee correct pin alignment; the unit self-aligns to the existing back-plane DC bus using drawn aluminum bus bars with silver-plated contact surfaces. Phase rotation insensitivity of the armature controller is preserved, so the maintenance team does not need to verify phase sequence on site – a genuine advantage in remote mining electrical drives and control installations.
For production environments where documentation is mandated by ISO 9001 or similar standards, the Eurotherm SDD590 Expanded Drive comes with a full set of 3D mechanical drawings, electrical schematics, and a FAT (Factory Acceptance Test) report certifying performance at rated current and overload. This documentation reduces validation time and supports the engineering change management process.
Frequently Asked Questions
Q: Can the SDD590 Expanded Drive work with any 590P control board revision?
A: It is compatible with firmware version 5.x and above. Earlier versions may require a low-cost firmware EPROM swap, which HANI can supply pre-programmed. The hardware interface is physically identical across all revisions, preserving the original electrical drives and control wiring.
Q: Does the retrofit affect the existing feedback device (tacho, encoder) configuration?
A: No. The feedback terminals on the control PCB are unchanged, so armature voltage, analogue tachogenerator, or incremental encoder feedback modes are maintained exactly as before the upgrade.
Q: How is field economy operation handled after an expansion?
A: The field bridge in the expansion unit obeys the same standby field reduction command from the main control microprocessor. The economy threshold remains software-settable between 10% and 90% of rated field current.
Q: Can multiple SDD590 units be paralleled for higher current?
A: Yes, master-slave paralleling is fully supported using the existing current-sharing bus, making it possible to build electrical drives and control systems exceeding 6000 A with proper de-rating and thermal management.
Q: What about spare parts availability for the expansion unit 10 years from now?
A: The thyristor modules, gate drivers, and cooling fans are standard industrial components from major semiconductor manufacturers, ensuring sustained supply. The retrofit design deliberately avoids proprietary ASICs that could become obsolete.
Q: Do I lose CE/UKCA compliance when retrofitting old 590P panels?
A: The expansion unit itself meets the latest EMC and Low Voltage Directives. When installed in accordance with the supplied integration manual, the overall electrical drives and control assembly retains its compliance path, often with only a minor re-assessment of the enclosure-level declaration.
Real-World Performance: Extending the Life of Multi-Drive Electrical Drives and Control Systems
In a recent steel cold-rolling tandem line, five original 590P drives had accumulated over 120,000 operational hours. Instead of replacing all cabinets, the plant opted for an incremental upgrade using the Eurotherm SDD590 Expanded Drive on the critical stand 3 and 4 units initially. Post-retrofit, the mill maintained section speed accuracy within 0.01% and achieved a 22% reduction in unscheduled downtime during the first year. The success has led to a phase-wise retrofit program for the remaining stands, all while keeping production running.
Such outcomes underscore why the SDD590 is not merely a component swap but a strategic electrical drives and control asset management decision. Where continuous processes generate revenue per hour, a temporary loss of specialized tuning knowledge during a full replacement can far outweigh hardware costs.
Summary: The Production-Safe Path to an Upgrade
The Eurotherm SDD590 Expanded Drive represents an engineered retrofit for mature 590P systems, bringing the power block back to factory-fresh performance without disturbing the control topology that operators trust. From the perspective of electrical drives and control engineering, it hits the critical points: galvanic isolation, software continuity, mechanical plug-compatibility, phase-rotation immunity, and sustained spare parts sourcing.
At HANI, we stock calibrated SDD590 expansion assemblies, provide turnkey test reports, and can support global commissioning through remote access to the drive’s serial port. When your electrical drives and control infrastructure needs a new lease on life without the cost and risk of a complete overhaul, the Eurotherm SDD590 route is the proven, science-backed choice.
Next steps – talk to our application engineers
Provide your existing 590P nameplate data, application notes, and desired overload margin. We deliver a pre-configured SDD590 expansion unit ready to install within your standard outage window. Contact HANI for a detailed technical proposal specific to your plant’s electrical drives and control layout.
HANI is one of China’s leading professional industrial electrical automation manufacturers, providing complete drive and control solutions to customers worldwide. HANI focuses on designing and manufacturing integrated automation systems that meet the industry’s highest standards of precision, efficiency, and durability. Our engineering expertise lies in providing turnkey electrical automation projects to optimize the performance of modern industrial manufacturing plants.
