Siemens C98043-A7105-L1-9 DC Power Supply Board – Obsolete SIMOREG Spare Part

Technical Dossier

Product Details And Specifications

Siemens C98043-A7105-L1-9 DC Power Supply Board – Obsolete SIMOREG Spare Part

When a DC power supply board fails inside a SIMOREG drive system, the consequences extend far beyond a single component. The SIMOREG DC Master series — and the broader Siemens 6RA family of DC converters — has been the backbone of heavy industrial drive applications for decades: steel rolling mills, paper machines, mining hoists, and large-scale process lines. A single unplanned shutdown on such a line can cost tens of thousands of dollars per hour. A forced system-wide upgrade, triggered by the unavailability of one board, routinely runs into the millions when engineering, rewiring, retraining, and production loss are factored in.

The C98043-A7105-L1-9, also referenced under assembly number A5F00105540-01, is the DC power supply board that keeps these drive systems alive. Siemens has discontinued this part through standard distribution channels. DriveKNMS maintains RFQ-reviewed sourcing status sourced through controlled industrial channels — available for immediate dispatch.

RFQ support for obsolete parts: Send the model number, required quantity and destination so DriveKNMS can confirm sourcing options before quotation.

Technical Specifications

Note: Electrical parameters such as input/output voltage ratings and current specifications are board-variant dependent. Confirmed specifications are provided upon request with unit verification documentation.

Solving the Discontinued Hardware Crisis

The SIMOREG DC Master platform was engineered for longevity, and many installations remain in active production service 20 to 30 years after commissioning. The DC power supply board is a critical internal sub-assembly: it provides regulated DC voltage rails to the drive's control electronics, gate firing circuits, and field supply sections. Without a functioning board, the entire drive is inoperable — there is no partial workaround.

Siemens' transition away from DC drive technology toward AC vector drive platforms (SINAMICS) has left a significant gap. Migrating from a SIMOREG-based system to a SINAMICS AC solution is not a board swap — it is a full engineering project. Motor replacement or rewinding, armature and field wiring redesign, encoder and feedback system changes, PLC program modifications, and operator retraining are all required. In a complex production environment, this migration can take 6 to 18 months and cost far more than the value of the original equipment.

Condition & Reliability Assurance

Obsolete industrial boards carry age-related failure risks that differ from new production components. DriveKNMS applies a structured 5-step incoming inspection protocol to all units before dispatch:

• Step 1 – Visual and Physical Inspection: Full board examination for mechanical damage, burnt traces, cracked solder joints, and contamination.
• Step 2 – Electrolytic Capacitor Assessment: Electrolytic capacitors are the primary age-related failure point on power supply boards. Each capacitor is checked for bulging, leakage, and ESR deviation. Units with degraded capacitors are either recapped or quarantined.
• Step 3 – Firmware and Component Version Verification: Where applicable, onboard firmware versions and EEPROM configurations are verified against known-good references to confirm compatibility with target drive revisions.
• Step 4 – Pin and Connector Integrity Check: All edge connectors and board-to-board interface pins are inspected for oxidation, corrosion, and mechanical deformation. Affected contacts are cleaned and treated.
• Step 5 – Functional Power-On Test: Units are bench-tested under controlled conditions to verify DC rail outputs and basic operational response prior to packaging.

Key Features for System Maintenance

Q: Can you supply other SIMOREG sub-assemblies?
A: Yes. DriveKNMS specializes in obsolete and hard-to-find industrial drive components across Siemens, ABB, Rockwell, and other major platforms. Contact us with your full BOM requirements.