Bosch DSS 1.3 Control Card

Technical Dossier

Product Details And Specifications

Bosch DSS Series Technical Notes

The Evolution of DSS Architecture

The Bosch DSS card family originated within the Bosch DIAX and Rexroth-era DC drive platforms, designed to interface with analog tachogenerator feedback and SCR (silicon-controlled rectifier) bridge assemblies. Early revisions — including the DSS 1.1 and DSS 1.2 — used discrete analog circuitry for PI current regulation, with manual potentiometer trimming for gain and offset calibration. The DSS 1.3 introduced improved EMC filtering on the feedback input stage and revised firing-angle linearization circuitry, making it the most widely adopted variant in the series.

Later revisions such as the DSS 1.4 and DSS 2.x sub-series incorporated surface-mount component density increases and revised EPROM-based parameter storage, though backward compatibility with existing drive chassis was maintained through consistent edge-connector pinouts. The DSS series has now entered its end-of-life phase; Bosch Rexroth no longer manufactures or provides OEM repair support for these cards. Industrial operators running DSS-equipped drives must rely on third-party spare parts suppliers and specialist repair houses for continued operation.

DSS Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly sourced models within the Bosch DSS control card family. Each entry reflects a distinct hardware revision or functional variant confirmed in field service documentation and industrial procurement records.

DSS 1.1: Early-revision armature current regulation card, discrete analog PI loop, potentiometer-set gain.
DSS 1.2: Revised feedback input filtering; improved noise immunity on tachogenerator signal path.
DSS 1.3: Standard production variant; enhanced EMC shielding, linearized firing-angle output, wide installed base.
DSS 1.4: SMD component revision; reduced board footprint, improved thermal margin on regulator ICs.
DSS 1.5: Final analog-architecture revision; added test-point headers for field diagnostics.
DSS 2.1: Hybrid analog/digital architecture; EPROM parameter storage, retained SCR gate drive compatibility.
DSS 2.2: Revised EPROM map; corrected current-limit response time in regenerative braking mode.
DSS 2.3: Extended temperature rating variant; specified for foundry and high-ambient environments.
DSS 3.1: Full digital regulation core; RS-485 diagnostic port, backward-compatible edge connector.
DSS 3.2: Expanded diagnostic register set; supports remote parameter readback via serial interface.
DSS 4.1: Transition-generation card; designed as drop-in replacement for DSS 1.x and 2.x in retrofit projects.
DSS 4.2: Revised gate drive output stage; compatible with higher-current SCR bridge assemblies.
DSS 5.1: Final-generation DSS architecture; integrated current transducer interface, reduced external wiring.
DSS 5.2: Variant with extended I/O connector for multi-axis coordination in tandem drive configurations.
DSS 6.1: Last catalogued DSS revision before series discontinuation; full digital, Profibus-DP option available.
DSS 6.2: Profibus-DP integrated variant; supports drive parameter management via fieldbus without local HMI.