Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Danaher Motion / Kollmorgen |
| Model | S20660-SRS |
| Series | S200 brushless servo drive |
| Input Power | 120/240 VAC or 20–90 VDC |
| Current Range | 1.5 A RMS continuous to 48 A peak (series range) |
| Feedback Resolution | 24-bit |
| Speed-Loop Bandwidth | Up to 800 Hz |
| Current-Loop Bandwidth | 3–5 kHz |
| Control Modes | Torque control, velocity control; indexing and programmable motion options |
| Communication | SynqNet option; CANopen option |
| Feedback Options | Smart feedback with electronic motor nameplate; EnDat 2.1/2.2, 1 Vp-p SinCos, Comcoder options available on S200 family |
| Separate “Keep-Alive” Supply | Yes — supports separate control power for fast recovery after E-stop |
| Mounting | Compact panel-mount; width approx. 28.7 mm to 94.6 mm depending on model |
| Standards | UL 508C, CE, EN 50178, EN 61800-3; SEMI F47 listed for S200 family |
| Typical Motor Match | Kollmorgen/AKM brushless servo motors |
Product Introduction
Servo drives do not fail loudly. They fail as missed positions, intermittent following errors, or a machine that “only faults on Tuesday after lunch.” The S20660-SRS is one of those compact Danaher Motion S200 drives that keeps showing up in semiconductor handlers, packaging machines, medical testers, and older AKM-based axes.What makes it useful in the field is the combination of 24-bit feedback, high loop bandwidth, and smart feedback support. When the motor carries an electronic nameplate, setup becomes much less painful: the drive reads motor parameters and reduces manual tuning. With up to 800 Hz speed-loop bandwidth and 3–5 kHz current-loop bandwidth, it can handle fast indexing and tight velocity control without constant gain chasing. My only caution: this is a legacy platform. Firmware, option cards, and feedback types vary. Do not assume a replacement S20660-SRS will match your existing configuration until you check the label, option slots, and saved parameter file.
Quality SOP & Tech Pitfalls
The Lab Report (SOP)
- Visual and counterfeit check: Danaher/Kollmorgen labeling, model S20660-SRS, serial number, hardware revision.
- Connector inspection: Power terminals, motor output, feedback connector, I/O, and communication option slots.
- Insulation/resistance check: Fluke 115 or equivalent for shorts, opens, and ground faults on power and motor output circuits.
- Control power test: Apply separate keep-alive/control supply if applicable; verify LED status and boot sequence.
- Live test: Confirm drive powers up, accepts parameters, and reports feedback without fault.
- Communication check: Verify SynqNet or CANopen option presence and link status if test equipment is available.
- Parameter verification: Load saved *.S2C configuration if provided; confirm motor type, feedback type, and current limits.
- Anti-static packing: ESD bag, photo documentation, and revision/option card notes before shipment.
The Engineer’s Warning (Pitfalls)
- Do not assume “S20660-SRS” means identical configuration. Two drives with the same model can differ in feedback type, option card, firmware, and saved parameters.
- Feedback mismatch is the most common commissioning failure. EnDat, SinCos, Hall, and smart feedback devices are not interchangeable without checking drive configuration.
- Save the old parameters first. If the drive still communicates, export the *.S2C file before removing it. Losing the file turns a 30-minute swap into a half-day recommissioning job.
- Separate keep-alive power matters. If the system uses a separate control supply for fast E-stop recovery, verify that circuit before blaming the drive.
I once replaced an S200 drive that kept faulting on enable. The replacement was the correct model, but the feedback type was wrong. The drive powered up fine, saw the motor, then tripped as soon as it tried to commutate. The fix was not a new drive; it was matching the feedback device and loading the correct parameter file.
Installation & Configuration Guide
1. Pre-Installation
- ⚠️ Lock out/tag out AC mains, DC bus, and motor power.
- ⚠️ Wait for DC bus discharge. Verify with a multimeter.
- Photograph the nameplate, connectors, option cards, feedback cable, and existing parameter screen.
- Export the existing parameter file if the drive is still communicable.
2. Removal
- Label motor phases, feedback cable, I/O, and communication cables.
- Disconnect motor power first, then feedback, then control I/O.
- Remove DIN rail or panel mounting hardware carefully.
- Cap feedback and communication connectors to prevent contamination.
3. Installation
- Verify model: S20660-SRS. Check option cards and feedback connector.
- Mount the drive securely and allow adequate cooling clearance.
- Reconnect motor phases in the correct order.
- Reconnect feedback cable and verify locking connector engagement.
- Restore control power before applying main power if the system supports separate keep-alive supply.
4. Power-On & Testing
- Verify input voltage matches the nameplate rating.
- Check LED status for normal boot and no immediate faults.
- Load the saved parameter file or reconfigure motor/feedback settings.
- Verify feedback is detected and motor phase identification is correct.
- Test jog mode at low speed before enabling full motion.
- Confirm torque, velocity, and positioning behavior match the application.
- Save parameters to non-volatile memory after final tuning.
Compatible Replacement Models
| Compatibility Tier | Option | Notes |
|---|---|---|
| ✅ Drop-in Replacement | Danaher/Kollmorgen S20660-SRS, same options and firmware | Best choice if feedback type, option card, and parameters match |
| ⚠️ Software Compatible | Other S200 series drives (S20xxx-SRS) | May require parameter migration, feedback reconfiguration, and tuning |
| ⚠️ System Upgrade | Kollmorgen AKD or newer servo platform | Expect rewiring, feedback adaptation, and project recommissioning |
| ❌ Hardware Mod Required | Generic VFD or non-matching servo drive | Not recommended for brushless servo axes requiring position/velocity control |
Frequently Asked Questions (FAQ)
Q1: Is S20660-SRS a VFD?
No. It is a digital brushless servo drive, not a standard AC variable-frequency drive. It expects brushless servo motor feedback and commutation data.Q2: What voltage does it accept?
The S200 family supports 120/240 VAC or 20–90 VDC. Confirm the exact rating on the S20660-SRS nameplate before energizing.Q3: Can I use it with any servo motor?
It is designed primarily for Danaher Motion/Kollmorgen brushless servo motors such as the AKM series. Other motors may work only if feedback, phasing, and tuning are properly configured.Q4: Does it support network control?
Yes. The S200 family supports SynqNet and CANopen options. Check the installed option card on your specific unit.Q5: Can I hot-swap it?
No. Do not hot-swap servo drives unless the machine builder and safety procedure explicitly allow it. Motor power, DC bus, and motion state make this unsafe in most applications.Q6: What if I lose the parameter file?
You can reconfigure the drive, but you must know the motor model, feedback type, current limits, and motion parameters. Without them, expect longer commissioning time.Q7: Is this part still in production?
Treat it as a legacy S200 drive. Many units in circulation are surplus or refurbished. For new systems, check current Kollmorgen product offerings and migration recommendations.
