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Servo Drive Boards

Servo drive boards are the internal electronic assemblies, control boards, power boards, and interface cards that perform the closed-loop regulation, feedback processing, and communication functions within a servo drive. PLC Direct supplies servo drive boards and servo control units from leading automation manufacturers as surplus sealed, refurbished, and used hardware, supporting component-level repair and maintenance of installed servo drive systems where a board-level failure is the root cause of the axis fault.

Where Are Servo Drive Boards Used in Industrial Environments?

Servo drive boards are used inside servo drive enclosures, where a control, power, or interface board has failed, and replacing that board is preferred over replacing the entire drive unit. Board-level replacement is common in servo drive systems where the drive chassis and motor are intact, but a specific drive control board or power section has failed due to age, component wear, or electrical fault.

Facilities and operations that depend on servo drive boards include:

CNC machine tool installations where SINAMICS S120 Control Units (CU310-2, CU320-2) are replaced as board-level components when the S120 axis system loses communication or control capability.

Packaging and assembly machinery use Yaskawa JANCD series servo control boards in legacy motion controllers and SERVOPACK systems to restore failed axes without replacing the full drive cabinet.

Heavy industrial and process plants where ABB ACS800 drive control boards, such as the RMIO-11C, are replaced to restore drive functionality after a control-side fault isolates the power stage as serviceable.

Automotive and metal fabrication operations maintain legacy servo drive systems, and servo drive PCB replacement extends the service life of installed machinery beyond what a full drive replacement would justify economically.

Maintenance workshops perform in-house repair of servo drives, where sourcing a confirmed replacement servo control board by part number is the first step in a structured fault-isolation and repair process.

When a servo drive board failure is confirmed by fault diagnosis, sourcing the correct replacement board by exact part number is the only reliable path to restoring the drive to full operational specification.

Which Brands of Servo Drive Boards Does PLC Direct Stock?

PLC Direct stocks servo drive boards, drive control units, and internal drive control cards from major automation manufacturers.

Siemens SINAMICS S120 Control Units: CU310-2 DP and CU320-2 PN are replaceable drive control units for SINAMICS S120 servo axis systems, providing the closed-loop control and PROFIBUS/PROFINET interface for connected Motor Modules.

ABB ACS800 Drive Control Boards: Internal drive control boards for ACS800 series drives are available for board-level repair of installed ABB drive systems, covering control and I/O board functions.

Yaskawa JANCD Series Servo Control Boards and Drive Power Boards: JANCD series servo axis control boards and compatible power boards support board-level maintenance of legacy Yaskawa servo drive and motion controller installations.

All servo drive boards at PLC Direct are available as surplus sealed, refurbished, and used, depending on current inventory.

What Should You Know Before Ordering Servo Drive Boards?

Hardware condition options: PLC Direct supplies servo drive boards as surplus sealed, refurbished, and used hardware. Surplus sealed boards are factory-sealed stock in original packaging; refurbished boards have been tested and restored to operational condition. Used hardware carries the same 1-year PLC Direct warranty as all other condition grades.

Compatibility and part identification: Servo control boards are drive-specific and, in most cases, version-specific. A replacement board must match the exact part number of the failed unit, including hardware revision suffix where applicable, as firmware and hardware variants within the same board family are not always interchangeable. For SINAMICS S120 Control Units, the CompactFlash card carrying the drive configuration is a separate item and must be accounted for when replacing a CU310-2 or CU320-2.

Warranty: All servo drive boards hardware purchased from PLC Direct carries a standard 1-year warranty covering defects and functionality, applicable to surplus sealed, refurbished, and used products.

PLC Direct supplies servo drive boards and hardware for replacement and maintenance purposes and does not provide system design, programming, or integration services.

Frequently Asked Questions

Board-level fault isolation typically involves checking the drive's fault log for codes indicating a specific subsystem, control power loss, an encoder interface fault, or communication failure, and verifying that the power stage is intact by measuring DC bus voltage and checking output phase continuity. If the fault is reproducible and isolated to the control or interface circuitry rather than the power section, board replacement is a viable repair path.

A servo drive control board handles digital control functions, including closed-loop regulation, feedback processing, communication interfaces, and parameter storage. A power board or power section handles the high-current switching that drives the motor. Failures in each have distinct symptoms; control board faults typically cause communication errors or encoder feedback loss, while power section faults typically cause overcurrent trips, output phase loss, or DC bus faults.

In most cases, yes. Replacing a drive control unit or control board resets the drive to default parameters unless the configuration is stored externally, on a CompactFlash card in the case of SINAMICS S120, or in a connected controller. Confirm how the drive's parameters are stored before replacing the board, so the configuration can be restored after the replacement is installed.

Yes. Legacy servo drive boards from families such as Yaskawa JANCD series are no longer manufactured but remain available through independent suppliers. Contact PLC Direct with the exact part number from the failed board's label to check current availability.