The REXROTH R911311899 MSK071E-0300-NN-M1-UP0-NNNN is an IndraDyn S synchronous servo motor designed for precise, high-response motion control in industrial automation equipment. It belongs to the Rexroth MSK servo motor family, a product range widely used in machine tools, packaging equipment, handling systems, printing machinery, plastic machinery, assembly lines, and other servo-driven production systems.
For procurement and replacement work, the complete identification should always include both the order number R911311899 and the full type code MSK071E-0300-NN-M1-UP0-NNNN. Public product listings identify R911311899 as the material number for MSK071E-0300-NN-M1-UP0-NNNN, so these two references should be kept together when preparing quotations, spare-parts requests, repair orders, and technical confirmation documents.
Basic Product Information
| Item | Description |
|---|---|
| Brand | REXROTH |
| Order Number | R911311899 |
| Full Model | MSK071E-0300-NN-M1-UP0-NNNN |
| Product Type | Synchronous Servo Motor |
| Product Family | IndraDyn S MSK Series |
| Motor Size | MSK071 |
| Motor Length | E |
| Winding Code | 0300 |
| Cooling Method | Natural Convection |
| Encoder Type | M1 Multiturn Absolute Encoder |
| Electrical Connection | 240 Degree Rotatable Plug |
| Shaft Version | Shaft With Keyway And Shaft Sealing Ring |
| Holding Brake | Without Holding Brake |
| Design Version | Standard NNNN |
| Protection Rating | IP65 |
| Net Weight | 23.5 kg |
| Typical Application | Industrial Servo Axis And Automation Equipment |
The MSK071E frame size is positioned as a medium-power servo motor within the MSK family. It is larger and stronger than compact MSK040 or MSK050 motors, but it is still more installation-friendly than heavy MSK100 or MSK101 frame motors. This makes the R911311899 MSK071E-0300-NN-M1-UP0-NNNN suitable for machine axes requiring a practical balance between torque output, dynamic performance, motor size, and installation flexibility.
The 0300 winding is a commonly used winding option for the MSK071E frame. According to Rexroth MSK071E technical data, the MSK071E-0300-NN version provides 23.0 Nm continuous torque at standstill at 60 K, 28.0 Nm continuous torque at standstill at 100 K, 84.0 Nm maximum torque, and 4,200 min-1 maximum speed. These figures place the motor in a useful range for applications requiring strong acceleration, reliable holding behavior through servo control, and stable torque delivery during cyclic machine operation.
Technical Specification Table
| Technical Parameter | Value |
|---|---|
| Motor Type | MSK071E-0300-NN |
| Continuous Torque At Standstill 60 K | 23.0 Nm |
| Continuous Current At Standstill 60 K | 12.5 A |
| Continuous Torque At Standstill 100 K | 28.0 Nm |
| Continuous Current At Standstill 100 K | 15.2 A |
| Continuous Torque With Surface Cooling Reference | 34.5 Nm |
| Continuous Current With Surface Cooling Reference | 18.8 A |
| Maximum Torque | 84.0 Nm |
| Maximum Current | 56.3 A |
| Torque Constant At 20 °C | 2.05 Nm/A |
| Winding Inductivity | 5.900 mH |
| Maximum Speed | 4,200 min-1 |
| Sound Pressure Level | Approx. 75 dB[A] |
| Protection Class | IP65 |
| Cooling Type | Natural Convection |
| Approximate Motor Weight | 23.5 kg |
The weight of this motor is an important practical detail. For MSK071E-0300 variants without a holding brake, public industrial listings commonly state a motor weight of 23.5 kg. Because the type code ends with UP0, the final “0” indicates that this configuration does not include a holding brake. Therefore, 23.5 kg is the appropriate reference weight for the bare motor, excluding packaging, cables, coupling parts, wooden case, export carton, and protective accessories.
Model Code Explanation
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S Synchronous Servo Motor |
| 071 | Motor Size 071 |
| E | Motor Length E |
| 0300 | Winding Code 0300 |
| 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 |
| NNNN | Standard Design Version |
The M1 encoder is a key feature of this motor. A multiturn absolute encoder allows the control system to retain position information over multiple shaft revolutions. This is valuable in machines where fast restart, accurate position recovery, and reduced homing time are important. In production environments, this can improve machine availability and reduce downtime after power cycling or controlled shutdown.
The UP0 configuration is also relevant for mechanical integration. The U connection style provides a rotatable plug connection, which gives more flexibility for cable routing during installation. This is useful when the motor is installed inside compact machine frames, protective housings, rotary modules, or equipment with limited cable clearance. The P shaft configuration indicates a shaft with keyway and shaft sealing ring. A keyway shaft can be preferred when the motor is connected to pulleys, couplings, gearboxes, or mechanical drive elements that require positive torque transmission.
Application Areas
| Application Area | Typical Motor Function |
|---|---|
| Packaging Machinery | Indexing, cutting, sealing, filling, and synchronized rotary movement |
| Printing Equipment | Roller drive, registration adjustment, tension-related motion |
| Handling Systems | Transfer axis, lifting support, rotary positioning |
| CNC Auxiliary Equipment | Feed axis, tool-changing support, controlled rotary drive |
| Plastic Machinery | Puller control, cutting unit, auxiliary material feed |
| Assembly Automation | Pressing axis, positioning station, pick-and-place support |
| Textile And Converting Equipment | Winding, unwinding, web feed, and material positioning |
| General Machine Automation | Medium-power servo axis with accurate feedback control |
The REXROTH R911311899 MSK071E-0300-NN-M1-UP0-NNNN is particularly useful where a machine needs stronger torque than a small servo motor can provide, but does not require the heavier frame size of an MSK100-class motor. Its 84.0 Nm maximum torque gives it sufficient peak reserve for acceleration, deceleration, load changes, and intermittent torque peaks. The 4,200 min-1 maximum speed also gives it enough speed range for many medium-duty servo applications.
Weight, Handling, And Logistics Notes
| Item | Practical Note |
|---|---|
| Bare Motor Weight | Approx. 23.5 kg |
| Brake Status | No Holding Brake |
| Handling Method | Manual lifting may require care due to weight and shaft protection |
| Packing Weight | Higher than motor weight after carton or wooden case packing |
| Shipping Check | Confirm gross weight and dimensions before international shipment |
| Installation Check | Verify flange, shaft, encoder, connector, and cable orientation |
Although 23.5 kg is not as heavy as larger MSK100 or MSK101 motors, it is still heavy enough to require proper handling during installation. The shaft, encoder housing, connector, and flange surface should be protected from impact. During international shipping, the gross weight should not be estimated using only the bare motor mass. Export packaging may add several kilograms depending on the packing method.
Engineering Selection And Replacement Notes
| Check Point | Reason |
|---|---|
| Order Number | Confirms exact Rexroth material configuration |
| Full Type Code | Prevents confusion with similar MSK071E variants |
| Encoder Type | Must match the existing servo drive feedback interface |
| Shaft Type | Must match coupling, pulley, gearbox, or mechanical load |
| Brake Option | This version has no holding brake |
| Connector Style | Affects cable routing and installation clearance |
| Cooling Type | Natural convection requires proper mounting and heat dissipation |
| Weight | Important for installation, mounting structure, and shipping |
When replacing this motor, it is not enough to match only MSK071E-0300. Other variants may have a different encoder, shaft type, holding brake, connector arrangement, or design suffix. For example, a UG0 version uses a different shaft configuration than UP0, and a UP1 version includes a holding brake while UP0 does not. A wrong replacement may cause mechanical incompatibility, cable routing issues, drive feedback faults, or missing brake functionality.
The safest replacement description is:
| Order Number | Full Model |
|---|---|
| R911311899 | MSK071E-0300-NN-M1-UP0-NNNN |
Product Summary
The REXROTH R911311899 MSK071E-0300-NN-M1-UP0-NNNN is a medium-power IndraDyn S synchronous servo motor designed for reliable industrial motion control. It combines the MSK071E frame, 0300 winding, natural convection cooling, M1 multiturn absolute encoder, rotatable plug connection, keyway shaft with shaft sealing ring, and a no-brake configuration. With 23.0 Nm continuous standstill torque at 60 K, 28.0 Nm continuous standstill torque at 100 K, 84.0 Nm maximum torque, 4,200 min-1 maximum speed, IP65 protection, and an approximate bare motor weight of 23.5 kg, this model is suitable for many medium-duty servo-axis applications.
