Lenze Servo Motor Replacement: MDSKARS vs MCA10I40 Comparison
Question: Can the Lenze MDSKARS056-22 (part number 385466) be directly replaced by the Lenze MCA10I40-RS0B0-B14N-ST5S00N-ROSU servo motor?
When a servo motor fails or becomes obsolete, finding a compatible replacement is critical to minimize downtime. Lenze offers a wide range of servo motors, but part numbers can be confusing. This article examines whether the MDSKARS056-22 and the MCA10I40-RS0B0 are interchangeable, based on technical specifications, mounting, feedback systems, and application requirements.
Understanding Lenze Servo Motor Series
Lenze has produced several servo motor families over the years. The MDSKARS series is an older generation, often found in legacy machinery. The MCA series is a newer, more advanced range with improved dynamics and encoder options. While both are three-phase synchronous servo motors, direct substitution is not always straightforward.
Decoding the Part Numbers
Let’s break down the two part numbers to understand their key characteristics:
| Feature | MDSKARS056-22 (385466) | MCA10I40-RS0B0-B14N-ST5S00N-ROSU |
|---|---|---|
| Series | MDSKARS (older generation) | MCA (newer generation) |
| Flange Size | 056 (IEC 56 frame) | 10 (IEC 100 frame) |
| Motor Length | 22 (specific stack length) | I40 (specific stack length) |
| Rated Torque (approx.) | 1.6 Nm | 2.5 – 3.0 Nm (depending on winding) |
| Rated Speed | 3000 rpm typical | 3000 – 6000 rpm (depending on winding) |
| Feedback System | Resolver (standard) | ST5S00N: Single-turn absolute encoder (EnDat or HIPERFACE) |
| Shaft/Holding Brake | Often with keyway, optional brake | B14N: Plain shaft, no brake (N) |
| Connector Type | Round connectors (older style) | RS0B0: Right-angle connectors, specific pinout |
| Protection Class | IP54 or IP65 (depending on version) | IP65 (typical for MCA) |
Key Differences and Compatibility Issues
Based on the part number analysis, several critical differences emerge:
- Flange Size: The MDSKARS has an IEC 56 flange (56 mm bolt circle diameter), while the MCA10 has an IEC 100 flange (100 mm BCD). This means the mounting holes and pilot diameter are completely different. A mechanical adapter plate would be required, which may affect alignment and rigidity.
- Feedback System: The MDSKARS typically uses a resolver, which outputs analog signals. The MCA10I40 with ST5S00N encoder is a digital absolute encoder (likely EnDat 2.1 or HIPERFACE). The drive must support this encoder protocol. If the existing drive only accepts resolver feedback, a firmware or hardware upgrade may be needed, or a different encoder option must be selected.
- Torque and Speed: The MCA10I40 generally offers higher torque and speed capabilities. While this might seem advantageous, the drive must be properly parameterized to avoid overloading the mechanics or causing instability.
- Connectors and Cabling: The connector style and pin assignments differ. New cables or adapters will likely be necessary, adding cost and complexity.
- Shaft and Brake: The MCA10I40 in this configuration has a plain shaft without a keyway and no holding brake. If the original MDSKARS had a keyway and/or brake, the mechanical connection and safety functions would be compromised.
Can They Be Interchanged?
In short, a direct drop-in replacement is not possible without significant modifications. The mechanical, electrical, and feedback differences are too great. However, with proper engineering, the MCA10I40 could be used as an upgrade, provided:
- The drive is compatible with the absolute encoder (or the encoder is changed to resolver).
- A mechanical adapter flange is fabricated to match the mounting.
- New cables are sourced or built.
- The drive parameters are adjusted for the different motor data.
- The shaft connection is adapted (e.g., adding a keyway or using a clamping hub).
Important: Always consult the original drive manual and Lenze technical support before attempting a substitution. Using an incompatible motor can damage the drive, motor, or machine, and may void warranties.
Recommended Replacement Path
If the MDSKARS056-22 is obsolete, Lenze often suggests a migration path to the MCS or newer MCA series. The exact replacement depends on the application requirements. For a closer match, consider:
- MCA 10 series with resolver feedback (e.g., MCA10I40-RS0B0-B14N-ST5R00N-ROSU, where R indicates resolver). This would eliminate the encoder compatibility issue.
- Mechanical adapter kit from Lenze or a third party to fit the IEC 100 motor to an IEC 56 mount.
- Complete drive and motor package if the existing drive is also outdated, ensuring optimal performance and support.
Conclusion
The Lenze MDSKARS056-22 and MCA10I40-RS0B0-B14N-ST5S00N-ROSU are not directly interchangeable due to differences in flange size, feedback, connectors, and shaft configuration. While an engineered retrofit is possible, it requires careful planning and additional components. For a smoother transition, work with a Lenze distributor to identify the correct replacement motor that matches your mechanical and electrical constraints.
This article is for informational purposes only. Always refer to official Lenze documentation and seek professional assistance for critical motion control applications.
