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High Performance New Synchronous Servo Motor Rexroth R911312986 MSK071E-0300-FN-S2-UG2-RNNN For Industrial Machinery
| Place of Origin | Germany |
| Brand Name | REXROTH |
| Certification | CE |
| Model Number | R911312986 MSK071E-0300-FN-S2-UG2-RNNN |
The REXROTH R911312986 MSK071E-0300-FN-S2-UG2-RNNN is a high-precision synchronous servo motor from the Rexroth MSK / IndraDyn S series. It is designed for industrial motion-control systems that require accurate positioning, stable torque output, high dynamic response, and reliable operation in demanding production environments. This model is suitable for machine tools, packaging equipment, printing machinery, textile machines, plastics processing lines, handling systems, and other automated equipment where servo performance and repeatable motion are required.
The full model code MSK071E-0300-FN-S2-UG2-RNNN identifies a motor with the MSK071E frame size, 0300 winding, liquid-cooling capable FN configuration, S2 encoder system, shaft with keyway and shaft sealing ring, and holding brake 2. The Rexroth order number R911312986 should always be used together with the complete model code when checking compatibility, preparing a quotation, or replacing an existing motor.
For product weight, the Rexroth MSK071E technical data lists the motor mass as 23.5 kg without holding brake and 25.1 kg with holding brake. Because this model uses the UG2 configuration, which includes holding brake 2, the correct net motor weight reference is approximately 25.1 kg. The gross packed weight may be higher depending on export packaging, wooden case protection, and shipping requirements.
Main Product Information
| Item | Specification |
|---|---|
| Brand | REXROTH |
| Order Number | R911312986 |
| Full Model | MSK071E-0300-FN-S2-UG2-RNNN |
| Product Family | MSK / IndraDyn S |
| Product Type | Synchronous Servo Motor |
| Frame Size | MSK071E |
| Winding Code | 0300 |
| Cooling Configuration | FN Liquid-Cooling Capable Configuration |
| Encoder Type | S2 Encoder System |
| Shaft Design | Shaft With Keyway |
| Shaft Seal | Included |
| Holding Brake | Yes, Holding Brake 2 |
| Net Product Weight | Approximately 25.1 kg |
| Maximum Speed | 4200 rpm |
| Protection Rating | IP65 |
| Insulation Class | F |
| Sound Pressure Level | Less Than 75 dB(A) |
Type Code Interpretation
The Rexroth MSK type code contains important configuration details. For replacement or spare-part purchase, it is not enough to search only for “MSK071E-0300.” The full code MSK071E-0300-FN-S2-UG2-RNNN should be checked because encoder type, cooling method, shaft design, brake configuration, and additional options can affect compatibility.
| Code Section | Meaning |
|---|---|
| MSK | Rexroth IndraDyn S synchronous servo motor series |
| 071E | Frame size 071 with E-length construction |
| 0300 | Winding variant |
| FN | Liquid-cooling capable motor version |
| S2 | Singleturn encoder system, EnDat 2.1 family |
| UG2 | Shaft with keyway and shaft sealing ring, with holding brake 2 |
| RNNN | Additional motor configuration code |
The S2 encoder configuration is different from the M1 or S1 encoder variants used in other MSK motors. In practical replacement work, this matters because the feedback interface must match the drive controller and parameter set. If the original system is configured for S2 feedback, replacing it with a different encoder type may require drive parameter changes or may not work at all.
Technical Performance Data
The MSK071E-0300-FN configuration is designed for stronger continuous performance than a purely naturally cooled motor version. The Rexroth technical data for MSK071E-0300-FN lists 23.0 Nm continuous torque at standstill at 60 K, 28.0 Nm continuous torque at standstill at 100 K, 43.7 Nm continuous torque at standstill with liquid cooling, 84.0 Nm maximum torque, and 4200 rpm maximum speed.
| Technical Parameter | Value |
|---|---|
| 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 at Standstill With Liquid Cooling | 43.7 Nm |
| Continuous Current at Standstill With Liquid Cooling | 24.9 A |
| Maximum Torque | 84.0 Nm |
| Maximum Current | 56.3 A |
| Torque Constant at 20 °C | 2.05 Nm/A |
| Voltage Constant at 20 °C | 126.4 V/min⁻¹ |
| Winding Resistance at 20 °C | 0.79 Ohm |
| Winding Inductance | 5.900 mH |
| Leakage Capacitance | 9.3 nF |
| Number of Pole Pairs | 4 |
| Rotor Moment of Inertia Without Brake | 0.00290 kg·m² |
| Thermal Time Constant | 19.8 min |
| Maximum Speed | 4200 rpm |
| Sound Pressure Level | Less Than 75 dB(A) |
| Ambient Operating Temperature | 0 to 40 °C |
| Degree of Protection | IP65 |
| Insulation Class | F |
Product Weight and Packing Reference
The weight of the REXROTH R911312986 MSK071E-0300-FN-S2-UG2-RNNN should be stated carefully because the same MSK071E frame can be supplied with or without a holding brake. For the MSK071E technical data, the base mass is 23.5 kg, while the value in brackets, 25.1 kg, refers to versions with holding brake. Since this model contains UG2, the recommended net product weight is approximately 25.1 kg.
| Weight Item | Reference Value |
|---|---|
| MSK071E Net Weight Without Holding Brake | Approximately 23.5 kg |
| MSK071E Net Weight With Holding Brake | Approximately 25.1 kg |
| Correct Net Weight for R911312986 | Approximately 25.1 kg |
| Gross Shipping Weight | Must Be Confirmed Before Shipment |
| Packing Note | Wooden case, foam support, shaft protection, and pallet packing may increase total weight |
For international B2B trade, the net motor weight should be separated from the packing weight. The final gross weight may include wooden-case packaging, moisture-proof wrapping, internal foam, shaft-end protection, connector protection, and pallet reinforcement. For product listings and Google-indexed pages, the safest wording is net product weight: approximately 25.1 kg; gross packed weight to be confirmed before shipment.
Cooling and Application Advantages
A major difference between this model and many standard MSK motors is the FN configuration. The technical table classifies the MSK071E-FN version under natural and liquid cooling data, and the performance line includes a liquid-cooling continuous standstill torque value of 43.7 Nm. This makes the motor suitable for applications with higher continuous load requirements, provided the machine cooling system is correctly designed and maintained.
| Feature | Practical Benefit |
|---|---|
| Liquid-Cooling Capable Design | Supports higher continuous torque under suitable cooling conditions |
| Holding Brake 2 | Helps hold the axis when the drive is disabled |
| S2 Encoder Feedback | Supports precise position and speed control with compatible drives |
| Shaft With Keyway | Provides positive mechanical torque transmission |
| Shaft Sealing Ring | Improves shaft-side protection in industrial environments |
| IP65 Housing | Helps resist dust and water jets under correct installation |
| 84.0 Nm Maximum Torque | Supports acceleration and short overload cycles |
| 4200 rpm Maximum Speed | Suitable for medium-to-high-speed servo applications |
The holding brake should be treated as a holding device rather than a repeated dynamic braking system. For vertical axes, lifting mechanisms, or suspended loads, the machine design should include proper brake control, safety logic, mechanical risk assessment, and verification of the load-holding requirement.
Typical Application Fields
The R911312986 MSK071E-0300-FN-S2-UG2-RNNN is suitable for machines where high accuracy and controlled motion are required under continuous production conditions. It is especially relevant when a medium-frame servo motor must provide strong torque while maintaining stable thermal behavior.
| Industry | Typical Application |
|---|---|
| Machine Tools | Feed axis, rotary table, tool-changing mechanism, auxiliary positioning |
| Packaging Machinery | Film feed, sealing station, indexing unit, cutting axis |
| Printing Machinery | Roller synchronization, web feed, tension-related control |
| Plastics Machinery | Extrusion auxiliary drive, cutting unit, winding axis |
| Textile Machinery | Fabric feed, winding, synchronized roller control |
| Handling Systems | Transfer unit, lifting axis, gantry movement, rotary station |
| Assembly Automation | Servo pressing, indexing table, positioning fixture |
| Converting Equipment | Slitting, laminating, rewinding, and tension-controlled axes |
Replacement and Compatibility Notes
For replacement projects, the order number and full type code should be verified before purchase. A motor with the same MSK071E frame but a different encoder, brake, cooling code, or shaft option may not be a direct replacement. The exact order number R911312986 and model MSK071E-0300-FN-S2-UG2-RNNN should be checked against the machine documentation and nameplate.
| Compatibility Check | Reason |
|---|---|
| Order Number R911312986 | Confirms the exact material reference |
| Full Type Code | Prevents encoder, brake, cooling, or shaft mismatch |
| Encoder Type | S2 feedback must match the drive interface and parameter set |
| Cooling Configuration | FN version should match the machine cooling design |
| Brake Option | UG2 includes holding brake 2 |
| Shaft Design | Keyway shaft must match the coupling or mechanical transmission |
| Cable Connection | Power and encoder cables must match the motor configuration |
| Drive Controller | Drive parameters should match the MSK071E-0300-FN data |
Procurement and Inspection Guidance
When buying this motor as new, refurbished, or used stock, the supplier should provide clear confirmation of the nameplate, encoder feedback condition, shaft condition, brake function, connector condition, bearing condition, insulation test status, and packing method. This is especially important for liquid-cooling capable motors, because cooling-interface condition and sealing integrity can affect long-term reliability.
| Inspection Item | Recommended Check |
|---|---|
| Nameplate | Confirm R911312986 and MSK071E-0300-FN-S2-UG2-RNNN |
| Encoder | Verify S2 encoder feedback and connector condition |
| Holding Brake | Test brake release and holding function where possible |
| Shaft and Keyway | Check for wear, rust, impact marks, or deformation |
| Shaft Seal | Inspect for damage or leakage risk |
| Cooling Interface | Check sealing surfaces and connection condition |
| Bearings | Check smooth rotation, abnormal noise, and mechanical play |
| Insulation | Perform insulation resistance test before installation |
| Packaging | Protect shaft, encoder connector, power connector, and cooling interface |
SEO-Oriented Product Summary
The REXROTH R911312986 MSK071E-0300-FN-S2-UG2-RNNN synchronous servo motor is a medium-frame IndraDyn S servo motor for precision industrial automation and motion-control systems. It features a MSK071E frame, 0300 winding, FN liquid-cooling capable configuration, S2 encoder system, shaft with keyway, shaft sealing ring, holding brake 2, IP65 protection, and an approximate net product weight of 25.1 kg. With 28.0 Nm continuous standstill torque at 100 K, 43.7 Nm continuous torque with liquid cooling, 84.0 Nm maximum torque, and 4200 rpm maximum speed, this motor is suitable for machine tools, packaging machinery, printing equipment, plastics machinery, textile machines, handling systems, converting equipment, and automated production lines. For accurate replacement and purchasing, buyers should confirm both the Rexroth order number R911312986 and the full model code MSK071E-0300-FN-S2-UG2-RNNN before ordering.
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