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The DANAHER S21260-SRS is a high-performance digital servo drive engineered for precision motion control in industrial automation. Part of Danaher Motion’s S200 series, this compact drive delivers 12.6A peak current (6A continuous) to synchronous servo motors, enabling dynamic positioning in robotics, CNC, and assembly systems. The DANAHER S21260-SRS features advanced field-oriented control (FOC) with auto-tuning capabilities, optimizing torque ripple suppression and bandwidth up to 1.2 kHz for ultra-smooth motion profiles. Its integrated RS-485 communication (Modbus RTU) allows seamless PLC integration, while built-in I/O (4 digital inputs, 2 analog ±10V inputs, 2 open-collector outputs) supports standalone operation without external controllers.
Designed for space-constrained cabinets, the drive’s convection-cooled design eliminates fans and reduces maintenance. The DANAHER S21260-SRS supports resolver, incremental encoder, and Hall feedback interfaces, ensuring compatibility with Danaher’s AKM series motors. With 48–75 VDC input voltage range and IP20 protection, it operates reliably in industrial environments from -10°C to +55°C. Safety functions include overcurrent/overvoltage shutdown and STO (Safe Torque Off) compliance, meeting SIL 2 safety requirements.
DANAHER S21260-SRS
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | S21260-SRS |
| Manufacturer | Danaher Motion (Altra Industrial Motion) |
| Product Type | Digital Servo Drive |
| Output Current | 12.6A peak / 6A continuous |
| Input Voltage | 48–75 VDC |
| Control Modes | Torque/Velocity/Position (PVT interpolated) |
| Feedback Interfaces | Resolver/Incremental Encoder/Hall |
| Communication | RS-485 (Modbus RTU) |
| Digital Inputs | 4 (24V PNP/NPN configurable) |
| Analog Inputs | 2 (±10V, 14-bit resolution) |
| Outputs | 2 open-collector (50mA) |
| Switching Frequency | 16 kHz (adjustable) |
| Bandwidth | 1.2 kHz velocity / 0.8 kHz position |
| Dimensions (HxWxD) | 35 x 130 x 129 mm |
| Weight | 450g |
| Protection Rating | IP20 |
| Certifications | CE, UL, RoHS, SIL 2 (STO) |
Main Features and Advantages
Precision motion performance:
Advanced FOC algorithm achieves ±0.02% speed regulation accuracy with adaptive vibration suppression. Auto-tuning identifies motor parameters in <5>
Simplified integration:
DIP switches enable configuration without software. Pre-mapped I/O supports homing/limit switching. Modbus RTU allows real-time gain adjustment and fault logging. STO input meets EN 61800-5-2 safety standards.
Space-optimized design:
Convection cooling reduces footprint by 40% vs. fan-cooled drives. DIN-rail mounting (TS-35/7.5/15) enables vertical/horizontal installation. Transient overvoltage clamping (85V) protects against regenerative spikes.
Application Field
The DANAHER S21260-SRS excels in high-speed precision motion:
Semiconductor: Wire bonding head positioning with micron-level repeatability
Packaging: Rotary filler valve synchronization at 120 cpm
Medical Devices: CT scanner gantry rotation with near-silent operation
Robotics: SCARA joint control with 0.01° positioning accuracy
Printing: Web tension control via analog torque mode
DANAHER S21260-SRS
Related Products
DANAHER AKM21G-ANCN2-00: 200W servo motor with resolver feedback
DANAHER C01360-000: Cable kit for drive-motor connection
DANAHER S30660-SRS: 30A drive for higher-power AKM motors
DANAHER P20260-001: Regenerative resistor for dynamic braking
DANAHER M-2312-P5: Incremental encoder feedback module
Installation and Maintenance
Pre-installation preparation: Verify DC bus voltage stability (±5%). Ensure motor cable length ≤25m with shielded twisted pairs (BELDEN 9729). Ground motor frame and drive chassis (<0>
Maintenance recommendations: Monitor heat sink temperature (<75>
