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3. Key Technical Specifications
| Parameter | Value / Range |
|---|---|
| Series | KSM01 / KSM01.2B |
| Type | Motor-integrated distributed servo drive |
| DC Bus Voltage | 540–750 V DC |
| Control Voltage | 30–42 V DC |
| Communication | SERCOS 2 (RS422) |
| Encoder | Hiperface optical (single- or multi-turn absolute) |
| Continuous Torque (typical) | 2.2 Nm to 10.5 Nm (size-dependent) |
| Peak Torque (typical) | up to 35 Nm |
| Max Speed (typical) | 3400–6000 rpm |
| Cooling | Natural convection |
| Protection Class | IP65 |
| Connection | Hybrid connector (X3.1 / X3.2) |
| Parameter Storage | MMC memory card |
| Compatible Control | KCU electronic control unit |
| Optional | Electrically released holding brake |
4. Product Introduction
The Bosch Rexroth KSM01 (KSM01.2B series) is a motor-integrated servo drive from the IndraDrive Mi family. It combines a synchronous servo motor and the complete power/control electronics into a single flange-mounted unit designed for direct installation on the machine.
Power comes from a shared 540–750 V DC bus; control electronics run on a separate 30–42 V DC supply. Communication uses SERCOS 2. The unit carries IP65 protection, natural convection cooling, and stores firmware/parameters on an MMC card so a replacement can be commissioned quickly. It works with a KCU control unit and is intended for decentralized multi-axis systems where cabinet space and cabling must be minimized.
KSM01
KSM01
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No status LED / unit dead | Missing DC bus or 30–42 V control | ❌ Low | Measure DC bus and control voltage at hybrid connector | Check KCU supply and hybrid cable first |
| Axis does not enable | SERCOS communication or address error | ✅ High | Verify SERCOS status and drive address switches | Confirm address and fiber/copper link integrity |
| Over-temperature fault | Poor mounting or high ambient | ✅ Medium | Check flange contact and ambient temperature | Ensure proper heat-sink contact; improve airflow |
| Position error / encoder fault | Feedback or cable issue | ✅ High | Read diagnostic via IndraWorks; check hybrid connector | Inspect encoder signals and cable integrity |
| Holding brake does not release | Missing 24 V brake supply or wiring | ✅ High | Measure brake voltage during enable | Verify brake supply and parameter settings |
| Parameters lost after swap | MMC card not transferred | ✅ High | Confirm MMC card is present and readable | Always move the MMC card from the old unit |
If diagnostics do not clearly isolate the drive, capture the LED status, IndraWorks diagnostic log, and photos of the hybrid connector, then contact technical support before replacing the unit.
6. Frequently Asked Questions (FAQ)
Q: What does KSM01 actually mean?
KSM01 is the series designation for Bosch Rexroth IndraDrive Mi motor-integrated servo drives. Full type codes are longer (for example KSM01.2B-061C-35N-M1-HP0-SE-NN-D7-NN-FW). Always confirm the complete type code when ordering.
Q: Can I run a KSM01 without a KCU?
No. The KSM01 requires a KCU electronic control unit to supply the control voltage and manage the SERCOS network.
Q: Is the KSM01 still in production?
Many specific variants remain available as new surplus or through authorized channels. Availability varies by exact type code. We stock tested units and can verify the precise configuration.
Q: How do I replace a failed KSM01 quickly?
Power down, remove the hybrid connector, unbolt the flange, transfer the MMC memory card from the old unit to the new one, install the replacement, and power up. The MMC card carries the firmware and parameters so re-commissioning is minimized.
Q: What are the most common installation mistakes?
- Forgetting to transfer the MMC card.
- Incorrect SERCOS address or poor hybrid-cable seating.
- Inadequate thermal contact at the mounting flange.
- Mixing control voltage polarity or using the wrong hybrid cable.
Q: Does it support a holding brake?
Yes — many variants include an optional electrically released holding brake. Confirm the type code contains the brake option (commonly indicated by HP2 or similar) before ordering.
Keep these points in mind and the unit installs and runs cleanly in a properly configured IndraDrive Mi system.
