DANAHER S21260-SRS

Description

Technical Parameters (Key Specs)

• Supply Voltage: 230 V AC (single-phase) or 400 V AC (three-phase, depending on configuration)

• Continuous Output Current: 6 A rms

• Peak Output Current: 18 A rms (for 3 seconds)

• Control Modes: Position, velocity, torque, and homing

• Feedback Interface: Resolver (standard), optional incremental encoder or absolute encoder

• Communication: CANopen (default), optional DeviceNet, PROFIBUS, or EtherCAT (via adapter)

• Digital I/O: 8 inputs / 4 outputs (programmable)

• Analog I/O: 2 inputs (±10 V) / 1 output (±10 V)

• Protection: Overcurrent, overvoltage, undervoltage, overtemperature, short-circuit

• Operating Temp: 0°C to +45°C (derated above 45°C)

• Protection Class: IP20 (panel mount)

• Compliance: CE, UL, cUL

Advantages & Features

• Advanced autotuning – one-button motor setup with inertia measurement and filter optimization, reducing commissioning time by up to 70%

• High control bandwidth – up to 800 Hz speed loop, ideal for high-dynamic applications like pick-and-place

• Compact book-style design – 45 mm width, saves cabinet space

• Built-in safe torque off (STO) – meets SIL 2 / PL d, eliminating the need for external safety contactors in many applications

• Firmware upgradeable – via RS-232 or CANopen, keeping the DANAHER S21260-SRS current with new features

• Flexible command interface – accepts step/direction, analog velocity/torque, or fieldbus setpoints

• Integrated braking resistor – internal for small decelerations; external option for high-energy applications

Application Cases

• Semiconductor handling – wafer transfer robots requiring ultra-smooth motion and fast settling times (< 5 ms)

• Packaging machinery – high-speed carton erectors and case packers, achieving 120 cycles/minute with the DANAHER S21260-SRS controlling the main servo axis

• CNC routers – woodworking and metal cutting, where the DANAHER S21260-SRS delivers precise feed control with minimal following error

• Printing presses – register control for color-to-color alignment, maintaining ±1 mm accuracy at 300 m/min

Comparison with Competitors

The DANAHER S21260-SRS stands out with its built-in resolver support and advanced autotuning, often at a lower price point than competitors. However, if SIL 3 safety is mandatory, competitors may have an edge.

Selection Suggestions

• Motor matching: Ensure your motor’s rated current does not exceed 6 A continuous for the DANAHER S21260-SRS – typical matched motors are 100–200 W frame sizes

• Feedback compatibility: The DANAHER S21260-SRS works natively with resolvers – if your motor has an incremental/absolute encoder, verify that the optional encoder interface module is ordered

• Communication: CANopen is default – if your PLC requires EtherCAT or PROFIBUS, factor in the adapter module cost and lead time

• Regeneration energy: For vertical axes or heavy loads, calculate deceleration energy – the internal resistor handles small regen; external resistor (recommended for > 50 W average) is required for the DANAHER S21260-SRS in these cases

• Cabinet cooling: The DANAHER S21260-SRS dissipates ~30 W of heat – ensure adequate airflow, especially when multiple units are mounted side-by-side (maintain 20 mm clearance)

Precautions

• Power sequencing – always apply control power (24 V DC) before mains AC; remove mains before control power to avoid spurious faults

• Cable shielding – use double-shielded motor and feedback cables, grounded at both ends, to prevent EMC issues – the DANAHER S21260-SRS is sensitive to noise on resolver lines

• Motor cable length – keep motor cables under 20 m for resolver feedback; longer runs require additional line filters

• Grounding – use a single-point star ground for the drive system; improper grounding can cause intermittent commutation errors

• STO function – although the DANAHER S21260-SRS has built-in STO, it does not replace all safety relays – perform a risk assessment per ISO 13849

• Parameter backup – always save parameters via the setup software before replacing the DANAHER S21260-SRS to avoid manual re-entry

• Do not oversize regeneration – using an external resistor with resistance lower than the drive’s recommended minimum can damage the internal braking transistor

• Firmware updates – use only Danaher’s official software and cables; interrupting a firmware update can brick the DANAHER S21260-SRS

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