Parker SSD 590 Series Modules

Technical Dossier

Product Details And Specifications

Parker SSD 590 Series: Comprehensive Module Range and Technical Overview

The Parker SSD 590 Series DC drive platform is one of the most widely deployed digital DC motor control systems in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, offshore platforms, and continuous-process chemical plants, the 590 Series established a benchmark for closed-loop armature current control and field weakening in industrial DC drive applications. Its modular architecture — separating power conversion, control electronics, and field supply into discrete, field-replaceable assemblies — made it the preferred choice for plant engineers requiring long-term maintainability in environments where unplanned downtime carries significant financial and safety consequences. The AH385851U003 circuit board is a core control assembly within this platform, responsible for speed reference processing, current loop regulation, and diagnostic signal conditioning.

The Evolution of 590 Series Architecture

The 590 Series was introduced by SSD Drives (formerly Eurotherm Drives) in the late 1980s as a successor to the analog 580 Series platform. The initial 590 variants used hybrid analog/digital control boards with EPROM-based parameter storage. By the mid-1990s, Parker's acquisition of SSD brought full digital parameter management via the P3 operator panel and serial communications via RS-422/RS-485 (Modbus RTU). The 590C (Commander) and 590P (Plus) sub-variants introduced enhanced field supply regulation and expanded I/O mapping. The 591C extended the platform to four-quadrant regenerative operation. Later firmware revisions (version 7.x onward) added CANopen and DeviceNet adapter compatibility via plug-in option cards. The 590 Series entered its end-of-active-production phase circa 2010–2015, with Parker transitioning customers toward the Quantum III and then the Mentor MP platform. However, the installed base remains extensive, and replacement circuit boards — including the AH385851U003 — remain in active demand for lifecycle extension programs.

590 Series Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Parker SSD 590 Series ecosystem, classified by functional category:

Control & Regulation Boards

• AH385851U003: Main speed/current control PCB for 590 Series DC drives; handles armature loop and field regulation.
• AH385851U001: Variant control board; earlier revision with analog reference input configuration.
• AH385851U002: Intermediate revision control PCB; compatible with 590C/590P chassis variants.
• AH470736U001: Microprocessor control card for 590+ Series; supports enhanced serial comms and diagnostics.
• AH385851U004: High-current variant control board for 590 Series frames above 200A.

Power & Field Supply Modules

• 590C/0016/500/0011: 590C Commander, 16A, 500V AC input, single-phase field supply, standard I/O.
• 590C/0032/500/0011: 590C Commander, 32A, 500V AC input, enhanced field regulator.
• 590C/0063/500/0011: 590C Commander, 63A, 500V AC input, four-quadrant ready.
• 590C/0125/500/0011: 590C Commander, 125A, 500V AC input, heavy industrial frame.
• 590P/0016/500/0011: 590P Plus, 16A, 500V, with expanded analog I/O and PID block.
• 590P/0032/500/0011: 590P Plus, 32A, 500V, dual encoder feedback input.
• 590P/0063/500/0011: 590P Plus, 63A, 500V, field weakening with auto-tuning.

Regenerative & Four-Quadrant Variants

• 591C/0016/500/0011: 591C four-quadrant regenerative, 16A, 500V, anti-parallel thyristor bridge.
• 591C/0063/500/0011: 591C four-quadrant regenerative, 63A, 500V, for winder/unwinder applications.
• 591C/0125/500/0011: 591C four-quadrant regenerative, 125A, 500V, crane and hoist duty.

Communications & Option Cards

• AH385851U005: RS-485/Modbus RTU communications option card for 590 Series.
• AH470736U002: DeviceNet adapter card, plug-in format, 590+ Series chassis.
• AH470736U003: CANopen communications card for 590+ Series; DS402 drive profile.
• AH385851U006: Encoder feedback option card; supports incremental TTL encoder input for closed-loop speed control.

Sourcing Hard-to-Find & Obsolete 590 Series Parts

Quality Control for the 590 Series Range

Parker SSD 590 Series control boards — including the AH385851U003 — undergo a multi-stage verification process at DriveKNMS before dispatch. Each board is visually inspected for capacitor degradation, PCB trace corrosion, and component substitution indicators. Functional testing is performed on a dedicated 590 Series drive test rig, validating armature current loop response, field supply regulation accuracy, and serial communications integrity under load simulation. Backplane connector pins are inspected for fretting corrosion, a known failure mode in drives subjected to vibration-intensive environments. Firmware revision is confirmed and documented. Units that do not pass all test stages are quarantined and not offered for sale. A test report is available upon request for critical applications.