Siemens C98043-A7001-L2-4

Technical Dossier

Product Details And Specifications

Siemens C98043 Series Technical Notes

The Siemens C98043 series comprises the core control and interface boards used in SIMOREG DC Master and SIMOVERT drive platforms — systems with documented installation bases across petrochemical refineries, nuclear power auxiliary systems, steel rolling mills, and continuous process chemical plants. These boards govern firing pulse generation, current regulation, speed feedback processing, and field excitation control in DC drive cabinets rated from a few kilowatts to multi-megawatt configurations. The C98043 designation covers a family of printed circuit assemblies manufactured to Siemens industrial quality standards, with variants differentiated by function suffix (e.g., -A7001, -A7002, -A7003) and hardware revision level (e.g., -L1, -L2, -L4). Installed units remain in service in facilities where drive replacement is cost-prohibitive, making spare board availability a critical operational requirement.

C98043 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified members of the Siemens C98043 control board family, organized by functional category. Each entry reflects the board's primary role within the SIMOREG/SIMOVERT drive system.

Regulation & Control Boards

• C98043-A7001-L2-4: Main regulation board, current/speed loop control for 6RA70 DC drives
• C98043-A7001-L1-4: Earlier hardware revision of main regulation board, 6RA24/6RA26 compatible
• C98043-A7001-L4-4: Revised regulation board with updated EMC filtering and SMD components
• C98043-A7002-L1-4: Field supply regulation board, controls DC field excitation current
• C98043-A7002-L2-4: Revised field regulation board, improved thermal management
• C98043-A7003-L1-4: Pulse generation board, firing pulse output to thyristor gate circuits
• C98043-A7003-L2-4: Updated pulse generation board, revised gate drive output stage

Interface & I/O Boards

• C98043-A7004-L1-4: Analog I/O interface board, speed reference and feedback signal conditioning
• C98043-A7004-L2-4: Revised analog I/O board with extended input voltage range
• C98043-A7005-L1-4: Digital I/O interface board, binary command and status signal routing
• C98043-A7005-L2-4: Updated digital I/O board, additional optocoupler isolation stages
• C98043-A7006-L1-4: Technology board, extended closed-loop function blocks for winder/unwinder applications

Communication & Fieldbus Boards

• C98043-A7007-L1-4: PROFIBUS-DP communication board for 6RA70 series integration
• C98043-A7008-L1-4: Serial interface board, USS protocol communication adapter
• C98043-A7009-L1-4: Encoder interface board, incremental encoder feedback processing up to 300 kHz

Power Supply Boards

• C98043-A7010-L1-4: Internal SMPS board, generates regulated DC rails for control electronics
• C98043-A7010-L2-4: Revised SMPS board, improved hold-up time and short-circuit protection

Quality Control for the C98043 Range

C98043 boards present specific test challenges due to their mixed analog/digital architecture and dependence on drive-system context for full functional verification. DriveKNMS applies the following test protocol to all C98043 units: (1) Visual inspection for PCB delamination, capacitor bulge, corrosion on edge connectors, and solder joint integrity under 10x magnification. (2) In-circuit component verification of critical analog sections including op-amp networks, voltage reference ICs, and optocoupler isolation barriers. (3) Powered bench test using a SIMOREG 6RA70 test rig with calibrated load, verifying regulation loop response, I/O signal levels, and communication bus activity. (4) Thermal cycling to identify intermittent failures in solder joints and component packages. (5) Final documentation of test results, hardware revision, and any replaced components, issued with each unit. Units that do not pass all stages are either repaired to component level or classified as non-serviceable and removed from inventory.