Internal Cooling Simodrive Sinamics Power Module 6SN1123-1AAOO-0BA2 6SN1123-1AA00-0BA2

Siemens 6SN1123-1AA00-0BA2 | SIMODRIVE 611 Internal Cooling Power Module — 400/480V AC / 600V DC Link

Power Module in the SIMODRIVE 611 Architecture

The 6SN1123-1AA00-0BA2 is a power module from the SIMODRIVE 611 series — the drive platform that became the standard axis drive system for SINUMERIK-controlled machine tools across automotive, aerospace, precision machining, and general manufacturing facilities. The power module handles the high-current switching for motor output. The drive control board — a separate component that mounts onto the power module — carries the axis parameters and handles communication with the SINUMERIK controller.

Both must be present and functional for the axis to operate. When a power module fails while the drive control board is intact, the control board is transferred to the replacement power module — drive parameters are stored in the controller or the control board, not in the power module itself. A parameter download from the NCU or drive configuration tool after installation restores axis settings.

Key Specifications

Internal Cooling — The Correct Specification for Standard Enclosures

The 0BA2 suffix identifies the internal cooling variant. This module manages thermal dissipation using the cabinet's ambient airflow — no rear-panel heatsink, no liquid cooling circuit, no additional cooling infrastructure required beyond adequate cabinet ventilation. The internal cooling version is correct for:

• Standard enclosed cabinets with normal ventilation where liquid cooling is not present
• Replacement of an existing internal-cooling SIMODRIVE 611 module
• Space-constrained layouts where adding external cooling hardware would require cabinet rework

The external cooling variant passes a heatsink through the cabinet rear panel to keep heat outside the enclosure. Replacing an internal cooling module with an external cooling variant (or vice versa) changes the cabinet installation requirements. Match the cooling suffix to the original installation.

DC Bus Architecture — Single Module Replacement

SIMODRIVE 611 modules share a common DC bus within a drive group. The infeed/regenerative supply module creates and maintains the DC bus; all power modules draw from it. Replacing a single failed power module restores the axis without affecting adjacent drives — the DC bus architecture means the replacement is mechanically and electrically self-contained within the drive group.

Before any work: Confirm the DC bus is fully discharged. SIMODRIVE 611 DC bus capacitors retain dangerous voltages for several minutes after mains power is removed. The charge indicator LED on the module must be fully extinguished before handling connections.

FAQ

Q1: Is the 6SN1123-1AA00-0BA2 compatible with SINUMERIK 840D and 810D?

Yes. SIMODRIVE 611 was designed as the drive system for SINUMERIK 840D sl, 840D, and 810D. Verify the axis assignment and drive configuration parameters in the NCU before commissioning the replacement module.

Q2: What is the difference between internal and external cooling versions?

Internal cooling uses ambient cabinet airflow — no external heatsink or dedicated cooling circuit needed. External cooling mounts a heatsink through the cabinet rear panel, keeping heat outside the enclosure. Always use the variant that matches the existing installation's cooling configuration. The suffix in the order number identifies the cooling type.

Q3: Can this module replace a failed unit without reconfiguring the drive system?

In most cases yes — provided the replacement has the same order number as the original. Drive parameters reside in the controller or the drive control board, not the power module. After physical installation, download axis parameters from the NCU or drive tool to restore settings. Always verify firmware compatibility between the drive control board and the SINUMERIK controller version before commissioning.

Q4: Does the 6SN1123-1AA00-0BA2 include the drive control board?

No. The 6SN1123 is the power module only. The drive control board — carrying axis parameters and SINUMERIK communication — is a separate component that mounts onto the power module. Both must be present for the axis to operate. When replacing a failed power module, transfer the original drive control board to the replacement if it is undamaged.

Q5: What should be checked before installing this replacement module?

Confirm the DC bus is fully discharged (charge indicator LED extinguished). Verify the replacement order number matches the original exactly, including the cooling suffix (0BA2 = internal). Confirm the drive control board being seated on the new module is correctly configured or is the original transferred from the failed unit. After installation, run a controlled test at reduced load before returning the axis to full production.