Bosch Rexroth SM-25/50-TCT-06231-103 Spare for SM Series

Bosch Rexroth SM-25/50-TCT-06231-103 Maintenance-Ready Spare for SM Series Automation

The Bosch Rexroth SM-25/50-TCT-06231-103 is a high-performance servo drive module engineered for demanding industrial automation environments. As a maintenance-ready spare, this unit is sourced, inspected, and dispatched to support rapid downtime recovery in SM Series servo systems. Whether you are managing a planned overhaul, responding to an unscheduled fault, or building a strategic spare parts inventory, the SM-25/50-TCT-06231-103 delivers the electrical performance and dimensional compatibility required for direct drop-in replacement without system reconfiguration.

Maintenance engineers and procurement teams operating Bosch Rexroth SM Series servo systems understand that a failed drive module can halt an entire production line within minutes. The SM-25/50-TCT-06231-103 is rated at a continuous output current of 25A with a peak capacity of 50A, operating from a DC bus voltage of 560V. Its TCT (Transistor Chopper Technology) topology ensures precise torque and velocity control, making it a critical component in servo axes used for CNC machining centers, packaging lines, press automation, and material handling systems.

Every unit shipped undergoes pre-dispatch functional verification covering power stage integrity, gate driver response, and communication interface continuity. This ensures that the replacement module arrives ready for immediate installation, minimizing the time between fault detection and system restoration.

Spare Maintenance Table

Maintenance Planning for Continuous Operation

When replacing the SM-25/50-TCT-06231-103 in a live servo cabinet, a thorough inspection of the surrounding electrical circuit is essential to prevent repeat failures and ensure long-term system stability. Maintenance engineers should begin by verifying the DC bus supply from the associated Bosch Rexroth TVD or TVM power supply module, as an unstable or over-voltage bus is a leading cause of drive module failure. The regenerative feedback circuit and braking resistor should also be checked for continuity and thermal damage.

The feedback cable connecting the SM module to the motor encoder — typically a Bosch Rexroth IKS or IKG series feedback cable — must be inspected for insulation wear, connector pin corrosion, and shielding integrity. A degraded feedback signal can cause the replacement drive to fault immediately upon commissioning. Similarly, the motor power cable (IKL series or equivalent) should be tested for phase-to-phase and phase-to-ground insulation resistance before energizing the new module.

Within the control cabinet, the DSS01 or DSS02 digital servo signal interface card, which handles the command signal routing between the CNC controller and the SM module, should be verified for firmware version compatibility and connector seating. If the system uses a Bosch Rexroth DIAX04 controller or an external Indramat CLC motion controller, confirm that the axis parameter set stored in the controller matches the replacement drive’s rated current and motor data.

Terminal blocks and 24V DC control voltage wiring to the drive’s enable and ready contacts should be inspected for loose terminations, as vibration-induced loosening is common in high-cycle press and stamping applications. The system’s 24V DC power supply module — often a Bosch Rexroth or third-party DIN rail PSU — should be load-tested to confirm it can sustain inrush current during drive initialization. Fuse holders and circuit breakers protecting the DC bus input should be replaced as a precaution if the original failure involved an overcurrent event.

For systems with multiple servo axes sharing a common DC bus, it is advisable to inspect adjacent SM Series drive modules for signs of thermal stress, capacitor bulging, or discolored PCB areas. A proactive replacement of aging modules in the same cabinet during a planned maintenance window significantly reduces the risk of cascading failures. Spare inventory should also include the associated Bosch Rexroth MKD or MKE servo motor feedback units, as encoder failures frequently accompany drive module faults in high-hour systems.

Site Replacement Workflow

Step 1 — Fault Isolation: Use the Bosch Rexroth diagnostic display or IndraWorks engineering software to read the active fault code from the SM module. Document the fault history before powering down to assist in root cause analysis.

Step 2 — Safe De-energization: Isolate the DC bus by switching off the TVD/TVM power supply and confirm bus voltage has discharged below 50V DC using a calibrated multimeter before touching any drive terminals. Allow a minimum of 5 minutes for capacitor discharge.

Step 3 — Module Removal: Disconnect the motor power connector, feedback cable, control wiring, and DC bus bars in sequence. Label all connectors before removal. Slide the SM module out of the drive rail.

Step 4 — Compatibility Verification: Confirm the replacement SM-25/50-TCT-06231-103 matches the original unit’s firmware slot, hardware revision, and axis parameter set. If the controller stores motor data internally, no re-parameterization is required for a like-for-like swap.

Step 5 — Installation and Test: Install the replacement module, reconnect all cables in reverse order, and restore power. Monitor the drive’s status display during initialization. Perform a low-speed jog test before returning the axis to full production speed.

Step 6 — Documentation: Record the replacement in the equipment maintenance log, including the date, fault code, replaced part number, and post-replacement test results. Update the spare parts inventory accordingly.

Spare Parts Support FAQ

Q1: Is the SM-25/50-TCT-06231-103 a direct replacement for all SM-25/50 variants?
The SM-25/50-TCT-06231-103 is compatible with standard SM Series mounting and bus configurations. However, the suffix “06231-103” denotes a specific hardware and firmware revision. We recommend confirming the original unit’s full part number before ordering to ensure a like-for-like replacement. Our technical team can assist with cross-reference verification.

Q2: What pre-shipment testing is performed on each unit?
Every SM-25/50-TCT-06231-103 unit undergoes functional testing of the power stage, gate driver circuits, DC bus interface, and control signal I/O prior to dispatch. A test report is available upon request. Units are packed in anti-static ESD-safe packaging with foam cushioning to prevent transit damage.

Q3: What does the 12-month warranty cover?
The 12-month warranty covers manufacturing defects and functional failures under normal operating conditions. It does not cover damage resulting from incorrect installation, overvoltage events, or physical mishandling. Warranty claims are processed with a replacement unit dispatched upon receipt and inspection of the returned module.

Q4: Can you support long-term or repeat supply for legacy SM Series systems?
Yes. We maintain ongoing stock of SM Series spare modules and associated components to support customers managing legacy Bosch Rexroth servo systems beyond the OEM’s active production period. Blanket purchase orders and scheduled delivery agreements are available for maintenance teams requiring predictable spare parts supply over 12–36 month horizons.

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