Description
Meta Description
Get technical performance specs, internal sub-components, and stocking recommendations for the Bosch Rexroth MSK076C-0450-NN-M2-UG1-RNNK synchronous servo motor.
Main Body
Field Assessment of the IndraDyn S Servo Series
Failing to plan for optical feedback degradation on high-speed packaging lines can quickly halt an entire downstream operation. During an emergency service call at a major bottling plant, a contaminated encoder glass on a legacy axis proved that keeping zero local spares for high-density servo channels creates a severe vulnerability. The Bosch Rexroth MSK076C-0450-NN-M2-UG1-RNNK (part number R911332084) is a permanent-magnet synchronous servomotor within the IndraDyn S product family. It translates raw drive-amplifier power into precise, high-bandwidth velocity control, managing demanding positioning and contouring axes without losing synchronization.
Technical Specifications
| Parameter | Value |
| Brand: | Bosch Rexroth Indramat |
| Model Number: | MSK076C-0450-NN-M2-UG1-RNNK |
| Part Number: | R911332084 |
| Motor Frame Size / Length: | 076 / C |
| Winding Code: | 0450 (Max speed up to 5,000 rpm) |
| Feedback Encoder Type: | M2 (Multiturn absolute optical encoder, EnDat 2.1) |
| Encoder Resolution: | 2048 signal periods per revolution |
| Mechanical Connection: | Plain shaft (no keyway) |
| Holding Brake Configuration: | UG1 (Electrically released holding brake, 11 Nm torque) |
| Electrical Connectors: | RNNK (Rotatable single-cable plug, 240-degree swivel) |
| Cooling Methodology: | Natural convection (fully passive) |
| Ingress Protection Rating: | IP65 |
| Insulation Class: | 155 (Thermal class F) |
Strategic Lifecycle and Stocking Analysis
By cross-referencing axis criticality with the active-to-mature lifecycle phase of the MSK series, this specific motor configuration demands a critical asset designation. Because it integrates a built-in holding brake and specialized EnDat feedback circuitry, finding an exact match on the secondary market during a sudden breakdown can introduce high lead-time variability.
We recommend maintaining a local buffer stock of 1 unit if your facility operates three or more identical MSK076 frames on critical paths. For smaller footprints, securing a frame agreement with a specialized servo stocking distributor guarantees a replacement unit arrives within 24 hours. Letting local safety stock hit zero means risking massive production losses, as standard factory lead times for customized winding configurations can extend for weeks.
Operational Boundaries and System Limitations
Do not mount this motor in environments exceeding +40 °C ambient without derating the continuous torque values by up to 20% according to OEM thermal charts. Well, technically the class 155 insulation protects the copper windings up to its thermal limit, but passive natural convection cooling relies entirely on clean, unobstructed housing fins and a solid metallic mounting plate to act as a heat sink. This plain shaft design is not recommended for traditional keyed pulley attachments—always utilize high-torque, backlash-free compression couplings or clamping hubs to prevent shaft slippage during rapid acceleration cycles.
Quick Conclusions
- Keep 1 unit on-site as an insurance policy if this servo drives a bottleneck indexing assembly.
- Verify encoder parameter matching in your IndraDrive firmware configuration prior to running the initial commutation alignment.
- Expect an express lead time of 1 to 2 business days when sourcing from verified industrial surplus platforms.
- Inspect the shaft sealing ring during routine maintenance; a breached seal allows oil migration to compromise the internal brake faces.
FAQ
What distinguishes the “M2” encoder variant on this Rexroth MSK motor?
The M2 code signifies a high-resolution, multiturn absolute optical encoder communicating via the EnDat 2.1 protocol with 2,048 signal periods, ensuring exact positioning retention without homing routines after a power cycle.
Can I field-repair the internal 11 Nm holding brake if it slips?
No. MSK076 motors feature a sealed factory assembly and cannot be safely repaired or adjusted on the shop floor. Brake degradation requires a comprehensive factory rebuild or full module replacement.
What is the advantage of the RNNK connector style?
The RNNK configuration provides a rotatable connector housing that swivels up to 240 degrees, allowing flexible cable exit paths and reducing mechanical cable strain in tight machine enclosures.
Channel Adaptation Notes
- Website Product Page: Position the hardware spec table directly adjacent to the primary product photograph. Clearly highlight the “Plain Shaft + 11 Nm Brake” mechanical configuration.
- LinkedIn Technical Post: Write from a practitioner standpoint. Highlight how simple visual inspections of motor cooling fins can prevent thermal faults and protect expensive multi-turn absolute encoders.
- Q&A Forum: Use the FAQ structural points to assist technicians attempting to convert older single-turn absolute configurations over to this premium multi-turn EnDat 2.1 version.
