Siemens C98043-A7001-L2-4 SIMOREG K 6RA24 Main Control Board
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Product Information
The Siemens C98043-A7001-L2-4 is the main electronic control and CPU board designed for the SIMOREG K 6RA24 series of microprocessor-controlled DC converters. Operating as the central processing unit within the drive assembly, this main control board manages speed and torque regulation, armature current control, and thyristor firing pulse generation for legacy DC motor applications. The board comes complete with a pluggable screw terminal block assembly, ensuring clean mechanical integration and distinct point-to-point connections for external system signals across heavy manufacturing, metals processing, paper production, and extrusion lines.
To connect to internal converter assemblies, the unit utilizes multi-pin ribbon cable interfaces and backplane bus connections linking to power interface cards and firing circuits, alongside RS-232 and RS-485 serial interfaces (G-SST1 / G-SST2). Commissioning a replacement unit requires transferring drive parameters or loading established parameter sets using either the simple operator panel (PMU) keypad or SIMOVIS engineering software. Integrated non-volatile EEPROM memory stores drive parameterization onboard without requiring continuous battery power, simplifying board swaps. Hardware revision level -4 offers full backward compatibility, allowing direct replacement of earlier revision variants including C98043-A7001-L2-1, -L2-2, and -L2-3, with technical support available from ABC Industrial Parts to verify drive parameter transfer.
System diagnostics and operating states are indicated directly on the integrated 7-segment PMU display, which presents active parameter values, r-parameters, and specific fault codes during drive operation. Built-in monitoring routines detect power supply fluctuations, phase missing conditions, field circuit anomalies, memory write errors, and processor watchdog events. First-line field checks should verify AC line voltages, main supply fuses, pulse transformer ribbon connections, and motor field winding resistance. Persistent internal failures, such as EEPROM corruption, internal power supply circuit defects, or watchdog timer trips, indicate board-level component failure that cannot be serviced on the plant floor. In these cases, installing a fully tested replacement module from ABC Industrial Parts provides a rapid path to restoring production uptime.
Technical Specifications
| Manufacturer | Siemens |
| Part number | C98043-A7001-L2-4 |
| Model / type | ELEKTRON. CONTR.C98043-A7001-L2 INCL. TERMINAL |
| Product family | SIMOREG K 6RA24 |
| Component type | Main Control Board |
| Module function | Main Electronic Control & Processor Board |
| Host system compatibility | SIMOREG K 6RA24 Series DC Converters |
| Terminal interface | On-board pluggable screw terminal blocks included |
| Serial interface | RS-232 / RS-485 (G-SST1 / G-SST2) |
| Parameter storage | On-board Non-Volatile EEPROM / NVRAM |
| Lifecycle status | Discontinued / Legacy |
Programming and Configuration
Configuration and parameterization of the Siemens C98043-A7001-L2-4 control board are performed using SIMOVIS engineering software or directly via the PMU operator panel keypad. System parameters govern armature current limits, speed regulator gains, field excitation thresholds, and I/O assignments across the SIMOREG K 6RA24 converter assembly.
All drive parameters are retained in non-volatile EEPROM memory integrated directly onto the control board. This design eliminates the risk of parameter loss during power shut-offs or long-term storage without requiring battery backup. When replacing an existing board, parameter profiles can be read out and saved via SIMOVIS or re-entered through the PMU interface.
Communication and System Integration
The C98043-A7001-L2-4 establishes serial communication using built-in RS-232 and RS-485 interfaces, identified as G-SST1 and G-SST2. These channels allow connection to local operator panels such as the PMU keypad as well as external PC workstations running SIMOVIS software for setup and monitoring.
Internal integration within the SIMOREG K 6RA24 converter is handled via high-speed backplane bus interfaces and multi-pin ribbon connectors. These internal links carry firing pulse trigger signals directly to the thyristor power assembly while routing feedback signals from current and voltage sensors back to the main processor. In addition, the integrated pluggable screw terminal block assembly handles field I/O connections without requiring total system rewiring.
Diagnostics and Status Indication
Diagnostic feedback on the Siemens C98043-A7001-L2-4 is facilitated through the PMU 7-segment digital display and status indicators. Real-time operating states, active r-parameters, and numerical fault codes are displayed directly on the front panel to assist technicians in identifying operating conditions.
Advanced troubleshooting is supported via SIMOVIS software, which provides access to the drive's diagnostic buffer and historical fault log memory. Monitoring r-parameters allows technicians to inspect actual feedback values, control loop states, and internal board status during live operation.
Status LED Indicators
| LED | Color/Status | Meaning |
|---|---|---|
| PMU Display / Status LEDs | Red/Green 7-Segment - Digital readout | Shows operating state, parameter numbers, or active fault numbers |
Replacement and Spare Part Considerations
When replacing a main control board in a SIMOREG K 6RA24 DC drive, using the C98043-A7001-L2-4 provides revision level -4 enhancements while maintaining full backward compatibility. This variant directly replaces older revision boards including C98043-A7001-L2-1, -L2-2, and -L2-3 without requiring structural modifications.
The inclusion of pluggable screw terminal blocks allows maintenance personnel to swap out the electronic board while keeping field wiring intact. Before putting a replacement board into active service, drive parameters stored in the non-volatile EEPROM must be reviewed and configured to match the target motor and power section specs using SIMOVIS or the PMU keypad.
Error Codes & Fault Codes
The following error codes may be displayed during operation or diagnostics:
| Code | Name | Description | Possible Cause | Recommended Action |
|---|---|---|---|---|
| F01 | Supply Overvoltage / Undervoltage | Electronic board power supply or line voltage outside allowable tolerance. | Line voltage drop or internal voltage supply circuit defect on control board. | Check line voltage; inspect internal board power supply; replace control board if failure persists. |
| F04 | Phase Failure / Firing Circuit Fault | Failure in main armature circuit power supply or line phase missing. | Blown main fuse, missing AC line phase, or failure in pulse trigger output circuit on C98043 control board. | Check main fuses and supply wiring. Inspect pulse transformer ribbon connections. |
| F05 | Field Circuit Fault | Field current actual value deviates from setpoint or field current lost. | Field supply failure, open field winding, or bad field measurement circuit on board. | Check field connections and motor field winding resistance. |
| F35 | EEPROM Fault | Error during reading or writing non-volatile EEPROM memory on control board. | Internal EEPROM chip failure or corrupted parameter data on board. | Re-initialize parameters to factory default. If fault recurs, internal hardware fault — replace control board C98043-A7001-L2. |
| F36 | Processor Hardware Fault / Watchdog | Microprocessor watchdog timer tripped or internal hardware malfunction. | EPROM/RAM corruption, severe electromagnetic interference, or internal board component failure. | Cycle power. If fault persists, board requires factory repair or replacement. |
Frequently Asked Questions
Can the C98043-A7001-L2-4 replace older revision boards like the L2-1 or L2-2?
Yes, as a revision level -4 control board, the C98043-A7001-L2-4 offers full backward compatibility and directly replaces older revision variants including C98043-A7001-L2-1, C98043-A7001-L2-2, and C98043-A7001-L2-3 in SIMOREG K 6RA24 DC converters.
How are drive parameters retained when replacing this board?
Parameters are saved in non-volatile EEPROM memory integrated on the board, eliminating the need for battery backup. When swapping boards, parameter sets can be transferred or reloaded using SIMOVIS software or manually re-entered via the PMU operator panel.
What software and communication interfaces are used to configure this board?
The board supports RS-232 and RS-485 serial communication (G-SST1 / G-SST2 ports) to connect with SIMOVIS parameterization software or the local PMU keypad operator panel.
What does fault code F35 indicate on the SIMOREG 6RA24 display?
Fault code F35 signals an error during reading or writing to the non-volatile EEPROM memory. Re-initializing parameters to factory defaults can resolve software glitches; if the fault recurs, it indicates an internal hardware failure requiring board replacement.
Does the board include wiring connections for field installation?
Yes, the board includes a complete pluggable screw terminal block assembly, allowing field I/O connections to be disconnected and re-attached without unwiring individual leads.
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