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The KOLLMORGEN S21260-SRS is a high-performance, single-axis servo drive engineered for precision motion control in demanding automation applications. Part of Kollmorgen’s acclaimed S200 series, this compact drive delivers 12.5 A continuous (20 A peak) current output with ultra-low ripple, enabling smooth torque control for brushless DC and brushed servo motors. The S21260-SRS integrates EtherCAT® communication for µs-level synchronization in multi-axis systems, while its advanced algorithm suite supports auto-tuning, vibration suppression, and electronic gearing. Designed for machine builders requiring space efficiency, the drive’s 143 mm depth fits tightly in control cabinets, and its convection cooling eliminates fan noise in medical or semiconductor equipment. With STO (Safe Torque Off) certified to SIL 3/PLe/Cat 4 (ISO 13849), the KOLLMORGEN S21260-SRS ensures functional safety without external relays. Native support for HIPERFACE DSL® feedback enables absolute positioning accuracy (±0.01°), making it ideal for robotics, packaging, and precision assembly.
KOLLMORGEN S21260-SRS
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | S21260-SRS |
| Manufacturer | Kollmorgen (Altron) |
| Product Type | Digital Servo Drive |
| Output Current | 12.5 A continuous / 20 A peak (3 sec) |
| DC Bus Voltage | 48–75 V DC |
| Control Loop Update | 62.5 µs (current), 125 µs (velocity/position) |
| Communication | EtherCAT® (CoE), CANopen |
| Feedback Interfaces | HIPERFACE DSL®, EnDat 2.2, Resolver, Sin/Cos 1 Vpp |
| Safety Functions | STO (SIL 3/PLe/Cat 4), SS1, SBC |
| Switching Frequency | 62.5 kHz (PWM) |
| Protections | Overcurrent, Overtemp, Short Circuit, Overvoltage |
| Operating Temperature | 0°C to 55°C (derate above 40°C) |
| Storage Temperature | -40°C to 85°C |
| Dimensions | 35 mm × 125 mm × 143 mm (W×H×D) |
| Weight | 0.45 kg |
| Certifications | CE, UL, cULus, RoHS |
Main Features and Advantages
Precision Motion Engine: The KOLLMORGEN S21260-SRS employs 32-bit DSP control with adaptive ripple compensation, reducing torque fluctuations to <0>
EtherCAT® Optimization: Achieves ≤1 µs jitter for distributed clocks, synchronizing multi-axis systems without dedicated motion controllers. Configurable PDO mapping enables real-time data streaming for predictive maintenance analytics.
Safety Integration: Dual-channel STO circuitry meets SIL 3 standards using internal redundancy monitoring, eliminating external safety relays. Dynamic brake management prevents coast-down during emergency stops.
Motor Agnostic Flexibility: Auto-identifies Kollmorgen AKM™/AKD™ motors via DLR (Drive-Less Rotary) technology. Customizable I/O (4 digital in, 2 analog ±10V, 2 digital out) supports external sensors or PLC handshaking.
Application Areas
The KOLLMORGEN S21260-SRS excels in high-speed, precision-critical automation. In semiconductor manufacturing, it controls wafer handling robots with sub-micron repeatability. Packaging lines deploy it for flying shears and rotary fillers, leveraging electronic camming for zero-gap product transfer. Medical device assembly utilizes its STO safety for collaborative robots handling sterile components. For laser cutting systems, the drive synchronizes galvo scanners with 0.001° accuracy. Printing presses benefit from its resonance damping to eliminate web flutter at 100+ m/min. In aerospace, it drives automated composite tape-laying heads with HIPERFACE DSL® absolute feedback ensuring positional integrity after power loss.
KOLLMORGEN S21260-SRS
Related Products
KOLLMORGEN AKM24E: Low-inertia servo motor (0.6–2.3 Nm) for S21260-SRS pairing
KOLLMORGEN AKD-TM: Terminal module for I/O expansion
KOLLMORGEN CVM-M0: Motion controller for complex multi-axis coordination
KOLLMORGEN S20360-SRS: Higher-power variant (18A continuous)
KOLLMORGEN TBM-2S-23: Brushless torque motor for direct-drive applications
KOLLMORGEN P8030: Power supply module (72V/30A)
Installation and Maintenance
Pre-installation preparation: Verify DC bus capacitance ≥2200 µF per drive using low-ESR capacitors. Ground motor shields at drive termination plate (≤0.1 Ω impedance). Isolate analog signals from power cables with minimum 10 cm separation.
Maintenance recommendations: Monitor heatsink temperature via EtherCAT® PDO; maintain <50>
The KOLLMORGEN S21260-SRS is a high-performance, single-axis servo drive engineered for precision motion control in demanding automation applications. Part of Kollmorgen’s acclaimed S200 series, this compact drive delivers 12.5 A continuous (20 A peak) current output with ultra-low ripple, enabling smooth torque control for brushless DC and brushed servo motors. The S21260-SRS integrates EtherCAT® communication for µs-level synchronization in multi-axis systems, while its advanced algorithm suite supports auto-tuning, vibration suppression, and electronic gearing. Designed for machine builders requiring space efficiency, the drive’s 143 mm depth fits tightly in control cabinets, and its convection cooling eliminates fan noise in medical or semiconductor equipment. With STO (Safe Torque Off) certified to SIL 3/PLe/Cat 4 (ISO 13849), the KOLLMORGEN S21260-SRS ensures functional safety without external relays. Native support for HIPERFACE DSL® feedback enables absolute positioning accuracy (±0.01°), making it ideal for robotics, packaging, and precision assembly.
Technical Specifications
| Parameter Name | Parameter Value |
| Product Model | S21260-SRS |
| Manufacturer | Kollmorgen (Altron) |
| Product Type | Digital Servo Drive |
| Output Current | 12.5 A continuous / 20 A peak (3 sec) |
| DC Bus Voltage | 48–75 V DC |
| Control Loop Update | 62.5 µs (current), 125 µs (velocity/position) |
| Communication | EtherCAT® (CoE), CANopen |
| Feedback Interfaces | HIPERFACE DSL®, EnDat 2.2, Resolver, Sin/Cos 1 Vpp |
| Safety Functions | STO (SIL 3/PLe/Cat 4), SS1, SBC |
| Switching Frequency | 62.5 kHz (PWM) |
| Protections | Overcurrent, Overtemp, Short Circuit, Overvoltage |
| Operating Temperature | 0°C to 55°C (derate above 40°C) |
| Storage Temperature | -40°C to 85°C |
| Dimensions | 35 mm × 125 mm × 143 mm (W×H×D) |
| Weight | 0.45 kg |
| Certifications | CE, UL, cULus, RoHS |
Main Features and Advantages
Precision Motion Engine: The KOLLMORGEN S21260-SRS employs 32-bit DSP control with adaptive ripple compensation, reducing torque fluctuations to <0>
EtherCAT® Optimization: Achieves ≤1 µs jitter for distributed clocks, synchronizing multi-axis systems without dedicated motion controllers. Configurable PDO mapping enables real-time data streaming for predictive maintenance analytics.
Safety Integration: Dual-channel STO circuitry meets SIL 3 standards using internal redundancy monitoring, eliminating external safety relays. Dynamic brake management prevents coast-down during emergency stops.
Motor Agnostic Flexibility: Auto-identifies Kollmorgen AKM™/AKD™ motors via DLR (Drive-Less Rotary) technology. Customizable I/O (4 digital in, 2 analog ±10V, 2 digital out) supports external sensors or PLC handshaking.
Application Areas
The KOLLMORGEN S21260-SRS excels in high-speed, precision-critical automation. In semiconductor manufacturing, it controls wafer handling robots with sub-micron repeatability. Packaging lines deploy it for flying shears and rotary fillers, leveraging electronic camming for zero-gap product transfer. Medical device assembly utilizes its STO safety for collaborative robots handling sterile components. For laser cutting systems, the drive synchronizes galvo scanners with 0.001° accuracy. Printing presses benefit from its resonance damping to eliminate web flutter at 100+ m/min. In aerospace, it drives automated composite tape-laying heads with HIPERFACE DSL® absolute feedback ensuring positional integrity after power loss.
Related Products
KOLLMORGEN AKM24E: Low-inertia servo motor (0.6–2.3 Nm) for S21260-SRS pairing
KOLLMORGEN AKD-TM: Terminal module for I/O expansion
KOLLMORGEN CVM-M0: Motion controller for complex multi-axis coordination
KOLLMORGEN S20360-SRS: Higher-power variant (18A continuous)
KOLLMORGEN TBM-2S-23: Brushless torque motor for direct-drive applications
KOLLMORGEN P8030: Power supply module (72V/30A)
Installation and Maintenance
Pre-installation preparation: Verify DC bus capacitance ≥2200 µF per drive using low-ESR capacitors. Ground motor shields at drive termination plate (≤0.1 Ω impedance). Isolate analog signals from power cables with minimum 10 cm separation.
Maintenance recommendations: Monitor heatsink temperature via EtherCAT® PDO; maintain <50>
