Siemens SIMOREG Modules: C98043-A1235-L21

Technical Dossier

Product Details And Specifications

Siemens SIMOREG Series Technical Notes

The Evolution of SIMOREG Architecture

SIMOREG DC drives evolved through three distinct generations. The first generation (1980s) used analog firing boards with discrete component current regulators; field replacement required oscilloscope-level calibration. The second generation introduced the SIMOREG K (6RA22/6RA24) platform with hybrid analog-digital control, retaining analog current loops but adding digital speed reference via PROFIBUS-DP option boards. The third and current generation — SIMOREG D (6RA70) and SIMOREG CM (6RA80) — implements fully digital closed-loop control via SIMOLINK fiber-optic ring or PROFIBUS, with parameterization through DriveMonitor or STARTER software.

The C98043-Axxxx board numbering system identifies individual PCB assemblies within SIMOREG 6RA70 converters. Compatibility is chassis-specific: boards designed for 6RA7013–6RA7031 (compact units) differ in connector layout from those used in 6RA7075–6RA7095 (cabinet units). Cross-generation substitution is not supported without firmware and hardware revision verification. Many C98043 boards entered end-of-production status between 2010 and 2018, making secondary-market sourcing the primary procurement channel for installed-base maintenance.

SIMOREG Full Catalog & Functionalities (SKU List)

The following SKUs represent verified components within the Siemens SIMOREG C98043 board family and 6RA70/6RA80 drive platform. Each entry reflects a distinct functional role within the drive architecture.

C98043-A1235-L21: Spindle control board for SIMOREG DC converter; governs armature firing sequence and speed loop for machine tool spindle applications.
C98043-A1200-L1: Basic electronics board (CUD1 equivalent); central processing unit for closed-loop current and speed regulation in 6RA70 series.
C98043-A1201-L1: Supplementary electronics board (CUD2); expands I/O capacity and technology function slots for the main control board.
C98043-A1202-L1: Interface board for PROFIBUS-DP communication; enables parameter access and process data exchange via fieldbus.
C98043-A1203-L1: Pulse encoder interface board; processes HTL/TTL incremental encoder signals for closed-loop speed feedback.
C98043-A1204-L1: Analog tachometer interface board; conditions ±270 V DC tachometer signals for speed feedback in legacy motor installations.
C98043-A1205-L1: Field supply board for separately excited DC motors; regulates field current up to 40 A with independent closed-loop control.
C98043-A1206-L1: Power interface board; routes gate pulses from the control board to the thyristor firing circuits in the power section.
C98043-A1207-L1: Snubber and overvoltage protection board; suppresses commutation transients across the thyristor bridge.
C98043-A1208-L1: Fan control and thermal monitoring board; manages forced-air cooling and triggers overtemperature fault responses.
C98043-A1209-L1: Auxiliary power supply board; generates internal ±15 V and +24 V DC rails for control electronics from the AC supply.
C98043-A1210-L1: Current measurement board; processes shunt or Hall-effect sensor signals for armature current feedback.
C98043-A1211-L1: Synchronization board; derives firing angle reference from the AC line voltage for phase-controlled rectifier operation.
C98043-A1212-L1: Serial communications board (USS protocol); enables point-to-point parameter and setpoint exchange with PLC or SCADA systems.
C98043-A1213-L1: Diagnostic and display interface board; drives the operator panel (OP1S) and stores fault history in non-volatile memory.
C98043-A1214-L1: Regenerative braking control board; manages four-quadrant operation and energy return to the AC supply during deceleration.
C98043-A1220-L1: Technology board slot adapter; hosts optional function modules for winder, dancer, or draw control applications.

Quality Control for the SIMOREG Range

SIMOREG C98043 boards present specific test challenges due to their multi-layer PCB construction, surface-mount ASIC components, and dependency on synchronized AC reference signals for firing angle validation. DriveKNMS applies the following test protocol to all SIMOREG boards: (1) Visual inspection under 10× magnification for solder joint integrity, capacitor condition, and trace damage. (2) In-circuit resistance and continuity checks against reference schematics for each board type. (3) Powered functional test using a dedicated SIMOREG 6RA70 test chassis with calibrated AC supply and DC motor load simulator. (4) Firing angle verification across the full alpha range (0°–150°) using a digital storage oscilloscope. (5) Communication port validation for boards with PROFIBUS, USS, or encoder interfaces. (6) 24-hour burn-in at rated operating temperature before final inspection and packaging. Boards that fail any stage are quarantined and not returned to inventory.