Description
Key Technical Specifications
| Parameter | Detail |
|---|---|
| Product Family | Kollmorgen ServoStar S200 |
| Model | S21260-SRS |
| Manufacturer | Danaher Motion / Kollmorgen |
| Drive Type | Brushless AC servo drive |
| Input Voltage | 120V AC or 240V AC, 1/3-phase capable |
| Continuous Output Current | 12.0 ARMS |
| Peak Output Current | Up to 30.0 ARMS |
| Feedback Resolution | Up to 24-bit |
| Speed Loop Bandwidth | Up to 800 Hz |
| Current Loop Bandwidth | 3–5 kHz typical for S200 family |
| Control Modes | Torque, speed, position; indexing via option |
| Communication | SynqNet, CANopen options; RS-232 service port |
| Compatible Motors | Kollmorgen AKM and compatible brushless servo motors |
| Certifications | UL 508C, CE; EN 50178 / EN 61800-3 family compliance |
| Mounting | Panel / cabinet mount, IP20 typical |
| Status | Legacy / surplus market availability |
Product Introduction
Installing a servo drive without confirming the current rating and feedback option is how you end up with a drive that powers up but never tunes properly. The Danaher S21260-SRS is a ServoStar S200-series brushless servo drive, built for compact industrial motion applications where AKM motors or compatible brushless servo motors need precise torque, speed, and position control.
It accepts 120V AC or 240V AC input and delivers 12.0 ARMS continuous output with peak current capability up to 30.0 ARMS, making it suitable for packaging, semiconductor handling, electronic assembly, medical equipment, and light industrial automation. The S200 family is fully digital, with high-resolution feedback support and fast current-loop response, so it can deliver smooth low-speed motion and quick acceleration without excessive tuning effort. Communication options include SynqNet and CANopen, depending on configuration. Because this is a legacy drive, always verify the nameplate input rating, feedback option, and firmware before treating it as a drop-in replacement.
QA/QC Transparency SOP
- Intake & Nameplate Verification — Confirm S21260-SRS model, input voltage rating, phase configuration, serial number, and feedback option. Check for burnt power terminals, damaged connectors, or prior overheat discoloration.
- Power-Up & Diagnostics — Energize with correct AC input. Verify LED status, fault history, DC bus voltage, and service-port communication via RS-232.
- Output Stage Tests — Check U/V/W output symmetry, IGBT gate drive signals, and current sensor offsets. Look for phase imbalance or abnormal DC bus ripple.
- Feedback & Communication Tests — Verify encoder/feedback interface response, SynqNet or CANopen option presence, and parameter read/write through the configuration tool.
- Load Simulation & Final QC — Run motor identification, basic torque test, and fault simulation. Clear fault history, back up parameters if permitted, and pack in anti-static material with nameplate photos and test summary.
Field Engineer Gotchas
- Input phase mismatch — The S200 family supports 120/240V AC input, but the exact phase configuration depends on the unit. Wiring a single-phase supply to a drive configured for three-phase, or vice versa, can cause DC bus faults or reduced current capability.
- Peak current misinterpretation — 12.0 ARMS continuous does not mean 12 ARMS peak. The S21260-SRS peak rating is higher, reported up to 30.0 ARMS on the nameplate. Undersizing the drive for dynamic moves will trigger overcurrent faults.
- Feedback option mismatch — S200 drives can be configured for different feedback devices. Replacing a drive without confirming the feedback option can prevent motor commutation or cause immediate faults.
- Firmware upgrade pitfalls — Firmware updates using WinLoader may fail if multiple I/O modules are present in the host rack. The initial connection baud rate is 19200, and downloads may run at 115.2k. A failed upgrade may require moving the CPU to a minimal rack configuration.
- Thermal derating — Continuous current capability drops at higher ambient temperatures. Do not assume 12 ARMS continuous is available in a poorly ventilated panel.
- Legacy drive substitution — Not every model is interchangeable. S20260, S20630, S21260, S22460, and S24860 differ in current rating and thermal capacity. Replace like-for-like unless the motor and application have been revalidated.
DANAHER S21260-SRS
Application Scenarios
- Packaging and labeling machines — Provides precise position and torque control for indexing axes, web tensioning, and cut-to-length operations.
- Semiconductor and electronics handling — Suitable for pick-and-place, wafer handling, and test equipment where smooth motion and fast settling are required.
- Medical and laboratory automation — Used in diagnostic analyzers, sample handlers, and pump drives where compact size and low electrical noise matter.
- — Useful for restoring failed axes in existing Kollmorgen installations without redesigning the motion network or replacing AKM motors.
FAQ
What is the Danaher S21260-SRS?
It is a Kollmorgen ServoStar -series brushless servo drive, used to control AKM and compatible servo motors in industrial motion applications.
What is its current rating?
12.0 ARMS continuous output, with peak output reported up to 30.0 ARMS. Always confirm the exact rating from the nameplate.
What input voltage does it accept?
120V AC or 240V AC, with single-phase or three-phase capability depending on configuration.
Only after verifying current rating, input configuration, feedback option, and thermal capacity. models are not universal substitutes.
Does it support SynqNet or CANopen?
Yes, depending on the installed option. Some drives are configured for SynqNet, CANopen, or basic analog/pulse control.
Is this drive still available new?
The series is a legacy product family. New OEM availability should be confirmed with Kollmorgen or an authorized distributor. Surplus and refurbished units are common; always request nameplate photos and test records.
