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Kollmorgen 77S-3000-G-09
Product Name: Kollmorgen 77S-3000-G-09 — Rotary Absolute Encoder (77S Series)
Product Overview:
The 77S-3000-G-09 is a high-resolution single-turn absolute rotary encoder from Kollmorgen’s 77S product family. It provides precise angular position feedback for servo motor applications.
Detailed content
Model Series: 77S Series Absolute Encoders
Key Specifications:
| Parameter | Value |
|---|---|
| Resolution | 3000 lines/rev (12,000 counts/rev, quadrature ×4) |
| Type | Optical, single-turn absolute |
| Output | SSI (Synchronous Serial Interface), BiSS-C |
| Shaft Diameter | 9 mm (hollow or solid, customizable) |
| Housing Diameter | 58 mm (standard) |
| Operating Voltage | 5 VDC ± 5% |
| Max Speed | 6000 RPM |
| Accuracy | ±1 arc-min (typical) |
| Repeatability | ±0.5 arc-sec |
| IP Rating | IP67 (with proper seal) |
| Operating Temp | -40°C to +85°C |
Construction & Materials:
- Housing: Stainless steel 316L or anodized aluminum
- Shaft: Hardened stainless steel (17-4 PH)
- Bearings: Ceramic hybrid bearings (Si₃N₄ balls)
- Optics: Glass code disc with LED illumination
- Seal: Double-lip Viton shaft seal
Working Principle:
A glass code disc with 3000 line patterns rotates with the shaft. An LED/photodiode array reads the pattern and outputs absolute position via SSI or BiSS-C protocol. Position is available immediately upon power-up — no homing required.
Advantages:
- True absolute position — no lost counts after power failure
- High resolution — 12,000 counts/rev for sub-0.03° resolution
- BiSS-C support enables daisy-chain topology and high-speed data refresh (up to 10 Mbps)
- Robust construction suitable for harsh industrial environments
Applicable Industries:
Robotics, CNC machines, antenna positioning, solar tracking, medical imaging, aerospace test equipment
Installation Requirements:
- Mount with coupling aligned to within 0.02 mm axial and 0.03 mm radial runout
- Use flexible coupling rated for max operating speed
- Ensure cable bend radius exceeds 5× cable diameter
- Ground encoder housing to system ground
Usage Notes:
- SSI is daisy-chain limited to 31 devices; use BiSS-C for larger systems
- Do not apply axial loads exceeding 50 N on the shaft
- Clean optical window annually in dusty environments
