ABB CMRB-11C 3AUA0000054682 Control Circuit Board – Obsolete ACS800 Spare Part

Technical Dossier

Product Details And Specifications

ABB CMRB-11C 3AUA0000054682 Control Circuit Board – Obsolete ACS800 Spare Part

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 specific to individual drive configurations vary. We do not publish unverified specifications. Contact our technical team for configuration-specific data.

Solving the Discontinued Hardware Crisis

Q: How are RFQ terms confirmed?
A: Quantity, required condition, documentation needs, destination and sourcing route are confirmed during RFQ review before quotation.

Replacing an ACS800 installation is not a weekend project. A single drive retrofit in a critical process line requires mechanical re-mounting, cable re-routing, parameter migration, safety relay re-validation, and in many jurisdictions, third-party commissioning sign-off. Conservative estimates place the total cost of a drive-level upgrade at USD 15,000–80,000 per unit depending on power class and site complexity. A facility running 20 ACS800 units faces a potential exposure of USD 300,000–1,600,000 if forced into a fleet-wide replacement cycle.

The CMRB-11C board is the control intelligence of the drive. Sourcing a verified replacement board extends the operational life of the entire drive assembly — motor, cabling, switchgear, and all associated infrastructure — without touching any of it. This is not a workaround. It is the correct asset protection strategy for facilities that cannot justify premature capital replacement.

How to extend your ACS800 asset life by 5–10 years at low cost:

Condition & Reliability Assurance

Every CMRB-11C unit processed by DriveKNMS passes a structured 5-step inspection protocol before it is offered for sale. This process is designed around the specific failure modes of legacy control boards, not generic electronics handling procedures.

1. Electrolytic Capacitor Assessment: All electrolytic capacitors are inspected for physical deformation, electrolyte leakage, and measured capacitance deviation. Units with capacitors outside tolerance are either recapped with equivalent-spec components or rejected from inventory.
2. Firmware Version Verification: The firmware revision loaded on the board is identified and documented. Compatibility with the target drive configuration is confirmed before dispatch review where application data is provided by the customer.
3. Pin and Connector Inspection: All edge connectors, ribbon cable interfaces, and board-to-board connectors are examined under magnification for oxidation, mechanical deformation, and contact integrity. Corroded contacts are treated or the unit is rejected.
4. PCB Surface and Solder Joint Inspection: The board surface is examined for cracked solder joints, lifted pads, and trace damage — common results of thermal cycling in drive enclosures operating over many years.
5. Functional Verification (where test equipment permits): Units are bench-tested against known-good reference configurations where our test infrastructure supports the specific board variant.

Key Features for System Maintenance

• Drop-in replacement: The CMRB-11C installs directly into the existing ACS800 control slot. No mechanical modification to the drive enclosure is required.
• No re-programming required: Drive parameters are stored in the DDCS communication board and FPGA memory, not on the CMRB-11C itself. In most configurations, swapping the control board does not require parameter re-entry.
• No engineering re-commissioning: Because the drive hardware interface remains unchanged, safety relay configurations, motor data, and process control setpoints are preserved. This eliminates the need for a commissioning engineer on-site for a board-level swap.
• Preserves existing motor and cabling investment: The motor, power cabling, and switchgear connected to the ACS800 remain in service. There is no disruption to the electrical infrastructure surrounding the drive.
• Avoids PLC integration rework: Drives communicating via DDCS, Profibus, or Modbus to upstream PLCs continue to operate on the same protocol stack. No changes to the control system architecture are required.

Can you supply other ACS800 control and power boards?
Yes. DriveKNMS specializes in ACS800 series spare parts across the full control and power stack. Contact us with your specific part numbers for availability and pricing.