ORIGINAL SIEMENS Irreversible Power Supply Board C98043-A7002-L1-12 C98043A7002L112 C98O43-A7OO2-L1-12

C98043-A7002-L1-12 | Siemens C98043-A7002 Power Supply Module — L1 Revision / 28×28×6 cm / 3 kg / Drive Power Supply Spare

C98043-A7002 — Drive Power Board Family With Multiple Revision Levels

The C98043-A7002 is a Siemens drive board family confirmed across multiple L-revision levels and functional types. Within the A7002 family:

The significant weight difference — 3 kg (L1-12) versus 0.7 kg (L4-12) — reflects the fundamental functional difference between the two: the L1-12 Power Supply Module contains the actual power conversion components (transformers, large capacitors, power transistors) that generate regulated DC voltages, while the L4-12 Power Interface Board provides a signal-level interface function.

Key Specifications

Power Supply Role in Drive Architecture

In Siemens drive systems, a power supply module of this class provides:

Regulated control power: The drive's control electronics — microprocessors, gate drivers, I/O circuits, display, and communication interfaces — all require precise, regulated DC voltages. The power supply module generates these voltages from the available supply (typically 24V or mains derived) and maintains them stable under varying load and supply conditions.

Isolation: Drive power supply modules provide galvanic isolation between the high-voltage power section and the low-voltage control electronics — protecting the control circuits and connected equipment from DC bus and mains voltage.

Protection: Over-voltage, under-voltage, and overcurrent monitoring on each output rail — ensuring that supply rail faults generate protective alarms before connected control electronics are damaged.

Application Scenarios

Drive power supply fault: A Siemens drive system loses control power — the display goes dark, the drive fails to respond, and no alarms are generated (no power to generate them). Investigation identifies the C98043-A7002-L1-12 power supply module as the fault. Replacement of the 3 kg power supply module restores control power to the entire drive system.

Planned maintenance: A facility maintaining Siemens drive equipment includes C98043-A7002-L1-12 in a planned power supply module renewal programme — proactively replacing the aging power supply before capacitor degradation causes a production interruption.

FAQ

Q1: How do I confirm C98043-A7002-L1-12 is the correct power supply module for my drive?

Read the installed module's full part number label — including the L-revision and trailing variant number (-12). If it reads C98043-A7002-L1-12, this is the confirmed replacement. The full part number must match exactly. Cross-reference with the drive's maintenance manual and spare parts table to confirm the module's position and output voltage specifications.

Q2: What is the difference between C98043-A7002-L1-12 (Power Supply Module) and C98043-A7002-L4-12 (Power Interface Board)?

Despite sharing the C98043-A7002 family prefix, these are functionally different products. The L1-12 Power Supply Module (3 kg, 28×28×6 cm) contains power conversion hardware — transformers, capacitors, and rectifiers — that generate regulated DC power. The L4-12 Power Interface Board (0.7 kg) provides a signal-level interface function between drive sections. The weight difference (3 kg vs 0.7 kg) reflects this functional distinction. These boards serve different purposes and are not interchangeable.

Q3: What symptoms indicate a C98043-A7002-L1-12 power supply module failure?

Power supply module failures typically produce: complete loss of drive control power (dark display, no response to operator inputs), incorrect supply voltages on one or more rails (causing erratic drive behaviour or specific voltage-sensitive alarms), or power supply overload alarms indicating the module is unable to maintain rated output voltage under load. Unlike inverter faults (which affect motor output) or control faults (which affect software), power supply failures affect all drive functions simultaneously.

Q4: What ESD and safety precautions apply when handling C98043-A7002-L1-12?

The C98043-A7002-L1-12 weighs 3 kg — two-handed lifting from an ESD-safe surface is required. Power the drive completely down and isolate the mains supply before accessing the power supply module. Capacitors in the module may retain charge after mains isolation — allow the recommended discharge time before handling. Use an anti-static wrist strap when handling the module to prevent electrostatic damage to the control circuitry.