Siemens SIMOREG DC Master Series PC Boards: SNAT6030BEB

Technical Dossier

Product Details And Specifications

Siemens SIMOREG DC Master Series: Comprehensive Module Range and Technical Overview

The Siemens SIMOREG DC Master series (6RA70 / 6RA24) represents one of the most widely deployed DC drive platforms in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, steel rolling mills, paper production lines, and offshore platform winch systems, the SIMOREG DC Master has maintained a dominant position in high-power DC drive applications since the mid-1990s. The SNAT6030BEB is a PC board (printed circuit board assembly) used within this drive family as a core control and firing circuit component, responsible for thyristor gate pulse generation and closed-loop speed/current regulation.

The Evolution of SIMOREG DC Master Architecture

The SIMOREG DC Master line succeeded the earlier SIMOREG K (6RA22/6RA24) and SIMOREG D (6RA26/6RA28) platforms. The 6RA70 generation introduced a fully digital control architecture replacing the analog/hybrid boards of its predecessors. Key architectural milestones:

• 6RA22/6RA24 (SIMOREG K): Analog control boards, thyristor firing via discrete hardware logic. Board types include SNAT-series firing boards and SDCS-series interface cards.
• 6RA70 (SIMOREG DC Master): Fully digital DSP-based control. PROFIBUS-DP native integration. Modular board architecture separating power interface (CUD1/CUD2), I/O expansion (ADB, TDB), and communication (CBP2, CBD).
• 6RA80 (SINAMICS DCM): Current-generation successor. PROFINET/PROFIBUS dual-port. Replaces 6RA70 in new installations. Backward-compatible field bus parameterization via STARTER/SINAMICS Startdrive.

Compatibility note: PC boards from the 6RA70 family are not interchangeable with 6RA80 boards. Cross-generation retrofits require full drive replacement or certified board-level adaptation kits.

SIMOREG DC Master Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Siemens SIMOREG DC Master (6RA70) and related SIMOREG K (6RA24) drive families. Each entry reflects a distinct functional board assembly:

SNAT6030BEB: Thyristor firing/gate pulse PC board for SIMOREG DC Master; controls armature converter firing sequence.
SNAT6030AEB: Variant firing board; alternate revision for 6RA70 armature bridge control.
SDCS-CON-1: Main control board for ACS600/SIMOREG interface; digital speed/current regulator core.
SDCS-CON-2: Enhanced control board with extended I/O; replaces CON-1 in later 6RA70 builds.
SDCS-CON-4: High-performance control board for 6RA70 large-frame units; dual encoder input.
SDCS-POW-1: Power supply board for SDCS control section; generates ±15V, +5V logic rails.
SDCS-POW-4: Heavy-duty power supply board; used in 6RA70 frames D–F (280A–2000A range).
SDCS-IOB-1: I/O expansion board; adds analog/digital I/O channels to base control board.
SDCS-IOB-3: Extended I/O board with additional relay outputs; used in multi-drive coordination.
SDCS-FEX-1: Field excitation control board; regulates field current for separately excited DC motors.
SDCS-FEX-2: Advanced field excitation board; supports field weakening and field reversal sequences.
SDCS-AMC-DC-1: Application macro card; stores drive parameter sets for rapid commissioning.
CBP2: PROFIBUS-DP communication board for 6RA70; plug-in slot module, supports DP-V1.
CBD: DeviceNet communication board for 6RA70; used in North American automotive plant installations.
SNAT4040PAC: Pulse amplifier card for thyristor gate drive; interfaces firing board to SCR gate circuits.
SNAT6030CEA: Alternate revision firing board; later production variant of the SNAT6030 family.
SDCS-PIN-48: Pulse interface board; connects control section to power section in 6RA70 large frames.
SDCS-DSL-4: Diagnostic and signal board; used for oscilloscope-level signal monitoring during commissioning.

Sourcing Hard-to-Find & Obsolete SIMOREG DC Master Parts

The Siemens 6RA70 SIMOREG DC Master series entered end-of-life (EOL) status, with Siemens AG formally discontinuing new production of most board-level components. Installed base units in continuous operation at refineries, steel mills, and utility plants require ongoing spare parts support that OEM channels can no longer reliably provide.

DriveKNMS maintains a dedicated inventory of SIMOREG DC Master PC boards, including the SNAT6030BEB and related SDCS-series assemblies, sourced from decommissioned drive units, certified repair returns, and verified surplus channels. All units are cataloged by revision level and firmware compatibility prior to listing. DriveKNMS provides lifecycle extension support for 6RA70 installations, including cross-reference to 6RA80 (SINAMICS DCM) equivalents where direct board substitution is not possible.

Quality Control for the SIMOREG DC Master Range

PC boards within the SIMOREG DC Master family present specific test challenges due to their mixed-signal architecture combining high-voltage thyristor gate drive circuits with low-voltage DSP logic. DriveKNMS applies the following verification protocol to all SNAT and SDCS board assemblies:

• Visual inspection: Component-level examination for capacitor bulge, PCB delamination, solder joint cracking, and corrosion on edge connectors.
• In-circuit parametric test: Verification of gate pulse timing, amplitude, and symmetry across all six thyristor channels using calibrated pulse analyzer equipment.
• Functional load test: Board installed in a reference 6RA70 drive frame and operated under controlled armature current load to verify closed-loop regulation performance.
• Firmware/revision verification: EPROM or flash content confirmed against Siemens revision matrix to ensure compatibility with target drive frame and software version.
• Burn-in: 24-hour thermal cycling at rated operating temperature prior to shipment.