| Specification | Value (Typical) | |---------------|------------------| | | 3-phase AC 230V / 400V (depending on internal rectifier) | | DC Bus Link | 300V – 560V DC | | Continuous Output Current | 15 A | | Peak Output Current (2-3 sec) | 36 A | | Switching Frequency | 8 kHz | | Supported Motor Types | MKD, MHD, 2AD, LAF series synchronous servomotors | | Feedback Interfaces | Resolver, EnDat encoder (optional) | | Command Interface | SERCOS (fiber optic), Analog ±10V, Step/Dir | | Protection Class | IP 20 (Chassis) | | Operating Temperature | 0°C to +45°C (derated above) |

Introduction In the world of industrial automation, motion control, and precision machining, part numbers are more than just labels—they are blueprints for capability. Among the myriad of servo drive components circulating in the secondary market and legacy systems, one identifier stands out for its specific performance envelope and engineering pedigree: the SMBD115 S Model 115 Full .

For factories running mixed automation lines, keeping a legacy drive in service often makes more financial sense than a full control upgrade—especially when the existing motors, cables, and mechanical plant are in good condition. The SMBD115 S Model 115 Full is a workhorse of the late 1990s and early 2000s industrial revolution. It is not the smallest, smartest, or most efficient drive on the market today. However, for those who own a machine built around it, the Full model represents a known quantity—a reliable, well-documented, and fully-featured servo drive that can be repaired, replaced, and reconfigured with standard tools.

| Fault Code | Meaning | Likely Fix | |------------|---------|-------------| | | DC bus overvoltage | Check braking resistor (measure 30-50Ω). Verify decel ramp | | F12 | Overtemperature | Clean fan filter; reduce ambient temp | | F22 | Motor feedback loss | Inspect resolver cables; measure excitation voltage (5V AC) | | F25 | SERCOS sync error | Clean fiber ends; check ring configuration | | F30 | Short circuit on output | Check motor insulation (should be >10MΩ) |

Whether you are troubleshooting an F22 fault, sourcing a refurbished unit, or planning a controlled migration to a modern drive, understanding the full depth of the SMBD115 S Model 115 Full will save you time, money, and frustration. Need specific pinouts for the X10 auxiliary connector or a parameter list for SERCOS configuration? Consult the official Rexroth DIAX04 manual (Document No. 115-840-001B) or contact a certified automation repair specialist.

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