Rexroth R911312638 MSK030B-0900-NN-S1-UP0-NSNN Servo Motor

Product Overview

The Rexroth MSK030B-0900-NN-S1-UP0-NSNN, identified by material number R911312638, is an IndraDyn S MSK synchronous servo motor developed for precise position, speed and torque control in industrial automation equipment.

This compact motor uses natural-convection cooling and incorporates an optical single-turn Hiperface encoder, a rotatable electrical connector, a keyed shaft with shaft sealing ring and no holding brake. The NSNN suffix identifies the standard ATEX design according to Group II, Categories 3G and 3D. It must not be confused with the RNNN increased-concentricity design.

The combination of the MSK030 frame, B motor length and 0900 winding is intended for compact, highly dynamic servo axes where low motor mass, accurate feedback and repeatable motion are important.

Main Product Information

Model Code Interpretation

Reference Technical Data

The following values are reference data for the MSK030B-0900 motor platform. Final selection and commissioning must be based on the complete R911 material number, motor nameplate and applicable project-planning documentation.

Performance values depend on installation conditions, motor temperature, altitude, drive settings and applicable explosion-protection requirements. Derating and application-specific restrictions must be checked in the corresponding project-planning and ATEX documentation.

Encoder and Mechanical Configuration

The S1 encoder is an optical single-turn Hiperface feedback device with 128 signal periods. It supplies precise rotor-position information for closed-loop position, speed and torque control. Because it is a single-turn encoder, the controller and machine project must manage any application requiring position tracking over multiple mechanical revolutions.

The keyed output shaft supports positive torque transmission through a compatible hub or coupling. During installation, verify the key dimensions, coupling balance, permissible radial and axial loading, shaft alignment and required balancing method.

The rotatable connector can be oriented by approximately 240 degrees to support practical cable routing. Connector orientation should be adjusted only within the permitted range, without applying excessive force or repeated twisting to the internal connection.

ATEX Configuration and Safety Verification

Before this motor is selected for an explosive atmosphere, the purchaser and responsible engineer must verify the complete nameplate, explosion-protection marking, equipment category, gas or dust group, temperature class, ambient-temperature range, installation zone and applicable local regulations.

The matching drive, cables, connectors, grounding system and machine protection concept must also comply with the applicable hazardous-area requirements. Do not infer certification solely from the MSK030B frame designation or from a visually similar motor.

Typical Applications

• Precision positioning and indexing axes
• Compact packaging and labeling equipment
• Automated assembly and handling systems
• Printing and converting machinery
• Small robotic and pick-and-place mechanisms
• Hazardous-area machinery when the complete ATEX installation is verified
• Maintenance replacement in compatible IndraDrive servo systems

Replacement Checklist

• Confirm complete model MSK030B-0900-NN-S1-UP0-NSNN.
• Confirm Rexroth material number R911312638.
• Compare the complete motor nameplate and ATEX marking.
• Verify the S1 Hiperface encoder interface and feedback cable.
• Confirm the rotatable connector and required cable orientation.
• Check the keyed shaft, shaft seal, coupling and balancing arrangement.
• Confirm that the application does not require a motor holding brake.
• Verify drive-controller compatibility and motor power-cable assignment.
• Check the controller project, motor parameters and encoder configuration.
• Verify hazardous-area category, temperature class and site requirements.

Related Models

Related MSK030B-0900 configurations may differ in encoder type, shaft design, holding-brake option, connector orientation and special design suffix. NNNN is the standard design, RNNN indicates increased concentricity, NSNN identifies the standard ATEX design, and RSNN combines increased concentricity with ATEX design.

These suffixes are not interchangeable descriptions. Replacement must be based on the complete type code and R911 material number.

Inquiry and Supply Notes

For accurate identification, provide a clear photograph of the complete motor nameplate, R911 material number, existing motor model, drive model, encoder and power-cable numbers, connector orientation, coupling details and machine application.

For an ATEX application, also provide the required installation zone, gas or dust classification, equipment category, temperature class, ambient conditions and available certification documents. Compatibility should be confirmed before installation or commissioning.