Siemens C98043-A7117-L1 Power Supply Module – SIMOREG DC Master

Siemens C98043-A7117-L1 / 6RY1803-0CM01 — Internal Power Distribution Board for SIMOREG DC Master 6RA70 Converters

The C98043-A7117-L1, catalogued under Siemens order number 6RY1803-0CM01, is the dedicated internal power supply board (PSU board) for the SIMOREG DC Master 6RA70 series fully digital DC drive platform. Within the drive’s modular architecture, this board occupies the power conditioning layer between the drive’s internal auxiliary transformer and every downstream electronic subsystem. Its function is not peripheral — without stable, regulated voltage rails from this board, the CUD (Central Unit Drive) control processor, the thyristor gate firing pulse transformers, the field supply regulator, and the operator panel interface all lose their operating reference. A failure at this board level produces F001/F002 class fault codes and results in a complete drive shutdown, making it the primary diagnostic target in any SIMOREG 6RA70 power-loss fault tree.

This page provides verified technical data, hardware architecture analysis, and procurement information for maintenance engineers, OEM integrators, and spare-parts procurement teams operating SIMOREG DC Master installations globally.

Real-time Stock & RFQ: [email protected] | WhatsApp: +86 18359268345

Technical Parameters

Hardware Logical Analysis

The C98043-A7117-L1 operates as the voltage regulation and distribution hub within the SIMOREG 6RA70 control chassis. Understanding its internal logic is essential for accurate fault diagnosis and replacement planning.

Multi-Rail Linear and Switching Regulation Architecture: The board accepts the unregulated AC output from the drive’s internal auxiliary transformer and passes it through a combination of rectifier stages and linear regulators (for low-noise analog rails) alongside switching converter stages (for higher-current digital supply rails). This hybrid approach ensures that the analog signal processing circuits on the CUD board — including the speed feedback comparator, current regulator, and EMF measurement chain — receive voltage rails with ripple below the threshold that would introduce measurement error into the closed-loop control algorithm.

Gate Firing Circuit Power Isolation: The thyristor bridge gate firing subsystem requires galvanically isolated power to prevent ground loops between the high-voltage power section and the low-voltage control section. The C98043-A7117-L1 provides isolated supply rails to the pulse transformer drivers, maintaining the creepage and clearance distances mandated by IEC 60664-1 for the voltage class of the 6RA70 converter. This isolation is a fundamental EMC design measure — it prevents conducted interference from the thyristor commutation transients from coupling back into the microprocessor supply domain.

Field Supply Regulator Interface: The DC motor field winding supply in a SIMOREG drive is regulated separately from the armature circuit. The C98043-A7117-L1 provides the control-side power to the field regulator board, which in turn governs the field current reference. Degradation of the field supply rail — even a 5–10 % deviation from nominal — can cause field weakening errors, manifesting as speed overshoot or torque instability at high speed. This makes the PSU board’s voltage accuracy directly traceable to drive dynamic performance.

EMC Design Measures: The board incorporates decoupling capacitor arrays at each voltage rail output, ferrite bead filtering on signal-adjacent supply lines, and ground plane segmentation to separate the switching converter return currents from the analog ground reference. These measures are consistent with Siemens’ internal EMC design guidelines for industrial drive electronics operating in environments with high-frequency interference from adjacent variable-frequency drives, contactors, and bus bars.

Thermal Stress Management: Linear regulator pass elements on this board dissipate power proportional to the input-output voltage differential. Siemens’ thermal design allocates sufficient copper pour area and, where applicable, heatsink contact surfaces to maintain junction temperatures within the component manufacturer’s rated limits at the maximum specified ambient of 55 °C. This thermal margin is critical for 24/7 continuous-duty applications such as paper machine drives and steel rolling mill auxiliary drives.

System Integration Benefits

• Direct OEM Dimensional Compatibility: The C98043-A7117-L1 is a board-for-board replacement within the 6RA70 chassis. No mechanical modification, re-wiring, or firmware parameter adjustment is required. Replacement time in a prepared maintenance window is typically under 30 minutes for a trained drive technician.
• Deterministic Control Loop Stability: Stable, low-ripple supply rails are a prerequisite for the CUD board’s 16-bit ADC channels to resolve speed and current feedback signals accurately. A degraded PSU board introduces noise into the feedback path, which the PI regulators interpret as process disturbance, increasing control loop jitter and reducing speed regulation accuracy below the drive’s rated ±0.01 % specification.
• Fault Code Transparency: Replacing a confirmed faulty C98043-A7117-L1 clears F001/F002 class faults at the root cause level, rather than masking them through parameter adjustment. This preserves the integrity of the drive’s diagnostic log for future maintenance analysis.
• Field Supply Regulation Accuracy: Restoring the field regulator supply to nominal ensures the motor field current is held within ±1 % of setpoint across the full speed range, maintaining the flux-speed characteristic required for accurate torque control in four-quadrant operation.
• Protection of Downstream Electronics: A failing PSU board with collapsing output rails can subject the CUD microprocessor and EPROM to under-voltage conditions that corrupt firmware execution or, in worst cases, damage non-volatile memory. Proactive replacement of a degraded board prevents secondary damage to higher-cost control components.
• Reduced Mean Time to Repair (MTTR): Stocking a verified C98043-A7117-L1 as a critical spare reduces MTTR from the multi-day lead time of an emergency procurement to the time required for a board swap. For continuous-process industries, each hour of drive downtime carries a quantifiable production loss cost that far exceeds the cost of a spare board.
• Compatibility Across 6RA70 Power Ratings: The PSU board design is common across multiple current ratings within the 6RA70 series, simplifying spare-parts inventory management for plants operating mixed-rating SIMOREG drive fleets.
• Supports Predictive Maintenance Programs: Electrolytic capacitors on the PSU board have a finite service life (typically 10–15 years at rated temperature). Scheduled replacement of the C98043-A7117-L1 as part of a drive overhaul cycle — rather than waiting for failure — is consistent with IEC 62443 and ISO 55001 asset management principles for critical drive infrastructure.

Quality Assurance & Global Logistics

Every C98043-A7117-L1 / 6RY1803-0CM01 unit supplied by siemensplc.com is sourced through verified channels with full traceability to Siemens AG manufacturing. Incoming inspection includes visual examination of PCB surface, solder joint integrity, connector pin condition, and component date code verification. Where applicable, units undergo powered bench verification against documented output voltage specifications before dispatch.

Packaging: Each board is individually sealed in an ESD-protective anti-static bag, placed in a foam-lined rigid carton with desiccant sachets, and labeled with part number, serial number, and inspection record. This packaging standard is maintained for both air freight and sea freight consignments.

Export Documentation: Commercial invoice, packing list, certificate of origin (China), and HS code declaration are provided as standard with every shipment. Additional documentation (material safety data, RoHS declaration, test reports) is available on request.

Logistics from Xiamen, China: Our warehouse is located in Xiamen, Fujian Province — a major international logistics hub with direct access to DHL Express, FedEx International Priority, UPS Worldwide Express, and multiple sea freight consolidators. Typical transit times: 2–4 business days to Europe and North America via express air; 1–2 business days to Southeast Asia. Sea freight LCL options are available for multi-unit orders where lead time permits. All shipments include online tracking from dispatch to delivery.

Warranty Terms: 12-month warranty from verified shipment date. Warranty covers manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed within 5 business days of receipt of the returned unit. Replacement or credit note issued upon confirmation of defect.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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