The REXROTH R911312639 MSK030C-0900-NN-M1-UP0-NSNN is a compact high-speed synchronous servo motor from the Rexroth IndraDyn S MSK series. It is designed for precision motion-control applications where compact installation size, fast response, stable feedback, and reliable operation are required. This model is suitable for small automation modules, electronic assembly equipment, packaging machinery, testing equipment, compact handling systems, light-duty indexing mechanisms, and high-speed servo axes.
For accurate purchasing and replacement, the product should be described using both identifiers: R911312639 as the order number and MSK030C-0900-NN-M1-UP0-NSNN as the complete motor type code. Public supplier listings identify R911312639 as MSK030C-0900-NN-M1-UP0-NSNN, so these two references should remain together in quotations, spare-parts lists, repair records, and technical documents.
Product Identification
| Item | Description |
|---|---|
| Brand | REXROTH |
| Order Number | R911312639 |
| Full Model | MSK030C-0900-NN-M1-UP0-NSNN |
| Product Type | Synchronous Servo Motor |
| Product Family | IndraDyn S MSK Series |
| Motor Size | MSK030 |
| Motor Length | C |
| Winding Code | 0900 |
| Cooling Method | Natural Convection |
| Encoder Type | M1 Multiturn Absolute Encoder |
| Electrical Connection | Rotatable Plug Connection |
| Shaft Version | Shaft With Keyway And Shaft Sealing Ring |
| Holding Brake | Without Holding Brake |
| Design Suffix | NSNN |
| Protection Rating | IP65 |
| Net Weight | 1.9 kg Without Holding Brake |
| Typical Use | Compact High-Speed Servo Axis |
The MSK030C frame is a small but capable servo motor size. Compared with the MSK030B frame, the MSK030C version has a longer motor body and a higher torque capability. It remains lightweight and compact, but it provides more mechanical output capacity than the shorter B-length variant. This makes the R911312639 MSK030C-0900-NN-M1-UP0-NSNN useful where a machine requires a small motor, but the load is too demanding for the smallest MSK030B version.
Technical Specification Table
| Technical Parameter | Value |
|---|---|
| Motor Type | MSK030C-0900-NN |
| Continuous Torque At Standstill 60 K | 0.8 Nm |
| Continuous Current At Standstill 60 K | 1.7 A |
| Continuous Torque At Standstill 100 K | 0.9 Nm |
| Continuous Current At Standstill 100 K | 2.0 A |
| Maximum Torque | 4.0 Nm |
| Maximum Current | 6.8 A |
| Maximum Speed | 9000 min-1 |
| Winding Code | 0900 |
| Cooling Method | Natural Convection |
| Encoder | M1 Multiturn Absolute Encoder |
| Shaft | Keyway Shaft With Shaft Sealing Ring |
| Brake | No Holding Brake |
| Protection Class | IP65 |
| Ambient Operating Temperature | 0 To 40 °C |
| Net Weight | 1.9 kg Without Brake |
Rexroth MSK030C-0900-NN technical data lists the no-brake motor weight as 1.9 kg, with the bracketed brake-equipped version shown as 2.1 kg. Since this type code is UP0, the final “0” indicates that this motor is without holding brake, so 1.9 kg is the correct bare motor weight reference for this configuration.
The same MSK030C technical data identifies the 0900 winding as a high-speed configuration with 9000 min-1 maximum speed. The small rotor inertia and compact frame allow fast acceleration and quick response when the motor is matched correctly with the servo drive, load inertia, coupling, and machine cycle requirements.
Model Code Explanation
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S Synchronous Servo Motor |
| 030 | Motor Size 030 |
| C | Motor Length C |
| 0900 | High-Speed Winding Version |
| NN | Natural Convection Cooling |
| M1 | Multiturn Absolute Encoder |
| U | Rotatable Electrical Plug Connection |
| P | Shaft With Keyway And Shaft Sealing Ring |
| 0 | Without Holding Brake |
| NSNN | Special Design Suffix |
The M1 encoder is one of the key configuration points in this motor. Unlike an S1 singleturn encoder, the M1 encoder is a multiturn absolute encoder. This means the system can retain positional information across multiple motor revolutions, depending on the drive and control architecture. For compact automation equipment, this can reduce homing time, improve restart accuracy, and support more reliable positioning after controlled shutdown or power cycling.
The UP0 section is also important. The U indicates a rotatable plug connection, which gives more flexibility when routing motor power and feedback cables in compact machine frames. The P indicates a shaft with keyway and shaft sealing ring. A keyway shaft can be useful when the motor is connected to pulleys, small gearboxes, couplings, rotary tables, or mechanical driven elements that require positive torque transmission. The final 0 confirms that this motor does not include a holding brake.
Weight And Logistics Information
| Item | Practical Reference |
|---|---|
| Bare Motor Weight | Approx. 1.9 kg |
| Brake-Equipped Reference Weight | Approx. 2.1 kg For Comparable Brake Version |
| Brake Status Of This Model | Without Holding Brake |
| Shipping Weight | Higher Than Bare Motor Weight |
| Packing Requirement | Protect Shaft, Connector, Encoder Area, And Flange |
| Freight Note | Confirm Gross Weight And Package Size Before Shipment |
Although the motor weight is only about 1.9 kg, the shipping weight should not be calculated from the bare motor mass alone. Export packaging, carton, foam protection, shaft protection, labels, and moisture-proof packing can increase the final gross weight. If shipped by express courier or air freight, the volumetric weight may also affect the freight cost.
For installation, the low weight makes the motor easy to handle compared with larger MSK061, MSK071, or MSK100 motors. However, it should still be protected carefully during transport and mounting. Impact on the shaft, connector, flange, or encoder area may affect mechanical accuracy or feedback reliability.
Application Areas
| Application Area | Typical Function |
|---|---|
| Electronic Assembly Equipment | Small feed axis, indexing unit, component positioning |
| Packaging Machinery | Labeling axis, film feed, light cutting movement |
| Laboratory Automation | Sample positioning, test fixture movement, compact rotary axis |
| Printing And Marking Equipment | Print-head positioning, roller adjustment, material feed |
| Semiconductor Equipment | Light transfer module, inspection movement, positioning axis |
| Small Handling Systems | Pick-and-place rotation, gripper adjustment, compact transfer axis |
| Medical And Test Machines | Repeatable controlled motion in compact equipment |
| General Automation | High-speed servo axis with absolute feedback |
This motor is especially useful where the equipment requires a combination of high speed, compact structure, and absolute multiturn feedback. It is not intended for heavy-load applications where large torque reserves are required. For heavier mechanical loads, larger MSK frames such as MSK050, MSK061, or MSK071 may be more suitable. The MSK030C-0900 version should be selected when speed, compactness, and positioning accuracy are more important than high continuous torque.
Engineering Selection Notes
| Selection Point | Why It Matters |
|---|---|
| Full Model Code | Prevents confusion with similar MSK030C variants |
| Order Number | Confirms the exact configured Rexroth material |
| Encoder Type | M1 multiturn feedback must match the servo drive interface |
| Shaft Type | Keyway shaft must match coupling or driven mechanism |
| Brake Status | This version has no holding brake |
| Connector Style | Rotatable connector affects cable routing |
| Design Suffix | NSNN should be preserved for correct replacement |
| Weight | Useful for mounting, handling, and logistics planning |
When replacing this motor, it is not safe to match only MSK030C-0900. Other motors in the same frame and winding may have different encoder systems, shaft versions, brake options, connector designs, or design suffixes. For example, M1 and S1 encoder versions are not interchangeable without confirming drive compatibility. Similarly, UP0 and UP1 differ because UP1 includes a holding brake, while UP0 does not.
The NSNN suffix should also be kept in the purchasing reference. Some motors may end with NNNN, while this specific motor ends with NSNN. In replacement work, the safest method is to copy the complete type code directly from the nameplate or from the machine spare-parts documentation.
Procurement And Replacement Format
| Required Field | Recommended Entry |
|---|---|
| Order Number | R911312639 |
| Full Model | MSK030C-0900-NN-M1-UP0-NSNN |
| Product Name | Rexroth IndraDyn S Synchronous Servo Motor |
| Weight Reference | Approx. 1.9 kg |
| Encoder | M1 Multiturn Absolute Encoder |
| Shaft | Keyway Shaft With Shaft Sealing Ring |
| Brake | Without Holding Brake |
| Cooling | Natural Convection |
| Protection | IP65 |
| Recommended Condition Description | New, Surplus New, Refurbished, Or Tested Used |
Product Summary
The REXROTH R911312639 MSK030C-0900-NN-M1-UP0-NSNN is a compact high-speed synchronous servo motor for precise industrial motion control. It combines the MSK030C frame, 0900 high-speed winding, natural-convection cooling, M1 multiturn absolute encoder, rotatable plug connection, keyway shaft with shaft sealing ring, no holding brake, and NSNN design suffix. With 0.8 Nm continuous standstill torque at 60 K, 4.0 Nm maximum torque, 9000 min-1 maximum speed, IP65 protection, and an approximate bare motor weight of 1.9 kg, this model is suitable for compact automation equipment requiring fast, repeatable, and accurate servo movement.
