Original Siemens Reversible Power Supply Board C98043-A7002-L4-12 C98043A7002L412 C98O43-A7OO2-L4-12

C98043-A7002-L4-12 | Siemens SIMOREG Power Interface Board — PIB / Screw Terminals / DC Drive Control Interface PCB

SIMOREG — Siemens' DC Variable Speed Drive Platform

The C98043-A7002-L4-12 is a spare part for the Siemens SIMOREG drive family — the SIMOREG series being Siemens' range of DC variable speed drives, distinct from the SIMOVERT AC drive range. While SIMOVERT drives control standard AC induction motors using inverter technology, SIMOREG drives use a fully controlled thyristor bridge to regulate the DC voltage applied to DC motors:

DC drives in context: DC motors were the dominant variable speed drive technology before AC drives matured. Despite widespread AC drive adoption, DC drives remain in service in many industries where long-running DC motor installations are still operating — rolling mills, hoists, extruders, winders, and marine applications where the existing DC motors represent substantial investments.

SIMOREG as a long-running platform: The SIMOREG series has served industry for decades. The C98043 prefix indicates a spare part from the established SIMOREG product family — providing replacement hardware for SIMOREG drive systems still in active service.

Key Specifications

A7002 — SIMOREG Board Family Identity

The C98043 prefix in Siemens' spare parts system identifies the SIMOREG DC drive board family. Within the C98043 spare parts range:

• A7002: The specific board family identifier — the Power Interface Board family for the SIMOREG product line
• L4: The hardware level/revision designation
• 12: The specific variant within the L4 revision level

The full designation C98043-A7002-L4-12 uniquely identifies this specific PIB variant within the complete SIMOREG spare parts catalogue.

Application Scenarios

SIMOREG PIB fault: A SIMOREG DC drive develops thyristor firing anomalies — irregular motor speed, asymmetric phase firing, or alarm codes pointing to control/power interface errors. The C98043-A7002-L4-12 PIB is identified as the fault. Replacement restores correct thyristor triggering.

SIMOREG drive maintenance: A production facility operating a legacy SIMOREG DC drive system replaces the C98043-A7002-L4-12 PIB as part of a drive overhaul — renewing the power interface board to prevent age-related failures.

FAQ

Q1: What is the difference between the SIMOREG (C98043 prefix) and the SIMOVERT (6SE70 prefix) drive systems?

SIMOREG drives control DC motors using thyristor-based controlled rectifiers — regulating the DC armature voltage applied to the motor to vary its speed. SIMOVERT drives control AC motors using IGBT inverters — varying the output frequency and voltage. The C98043 prefix identifies SIMOREG spare parts exclusively. The 6SE70xx prefix identifies SIMOVERT spare parts. The two drive technologies are completely separate; parts are not interchangeable.

Q2: What does the L4-12 designation in C98043-A7002-L4-12 indicate?

The L4 identifies the hardware revision level of the Power Interface Board within the A7002 family — different L-numbers correspond to different hardware generations of the same board function. The -12 further specifies the variant within the L4 generation. When ordering a replacement, the full C98043-A7002-L4-12 part number must match the installed board's label exactly — substituting an L3, L5, or different variant may cause incompatibility with the specific SIMOREG drive unit.

Q3: What symptoms indicate a C98043-A7002-L4-12 PIB fault in a SIMOREG drive?

PIB faults in SIMOREG DC drives typically produce: irregular or missing thyristor firing (causing motor speed hunting or inability to control armature voltage correctly), asymmetric current in the three phases of the supply (indicating one or more thyristors are not firing correctly), armature current measurement errors, or alarm codes on the SIMOREG's display identifying power interface or firing circuit faults.

Q4: Do screw terminal connections on C98043-A7002-L4-12 require any special tools for replacement?

No. The screw terminals on C98043-A7002-L4-12 accept standard wire ferrules using a standard screwdriver — no special crimping tools or proprietary connectors are required. Before removing the board, photograph or record all screw terminal wiring positions and label each wire to ensure correct reconnection. Verify all terminal screws are tightened to the specified torque after reconnection.

Q5: Does replacing C98043-A7002-L4-12 affect SIMOREG drive parameters?

No. The PIB is a hardware interface board — it contains no parameter memory. SIMOREG drive parameters are stored in the drive's control electronics memory. Replacing the C98043-A7002-L4-12 does not affect stored speed, current, or motor parameters. After fitting the replacement board, verify correct current and voltage measurement readings and confirm normal motor response at low speed before returning to production load.