Rather than relying on a universal substitute, applications specified with AG661 21 – 466121000000 typically require a replacement encoder that aligns closely with the original system design. A customized replacement solution can therefore be provided to ensure that the encoder integrates smoothly into the existing mechanical structure and control architecture.
The replacement encoder is configured as a multi-turn absolute device using an SSI interface with Gray code transmission, matching the original communication logic. It delivers a combined resolution of 4096 counts per revolution and 4096 multi-turn revolutions, enabling precise absolute position feedback across extended operating ranges. The unit operates from a DC 10–32 V supply and supports SSI clock frequencies up to 300 kHz, allowing reliable data exchange in motion control environments with moderate to high update rates. Mechanically, the encoder is designed for continuous operation at shaft speeds up to 8000 rpm, with internal reinforcement providing resistance to 100 g shock and 20 g vibration. The sealed IP67 housing ensures protection against dust and moisture in industrial settings.


This AG661 21 – 466121000000 replacement encoder is suitable for automated logistics systems, lifting and hoisting equipment, transfer mechanisms, and other installations where dependable absolute position information is required to maintain safe and repeatable motion.
Technical data
| Parameter | Value | Unit |
| Max. permissible speed | 6000 | rpm^-1 |
| Permissible angular acceleration of rotor | 10^5 | rad \cdot s^-2 |
| Moment of inertia of rotor | 45 | gcm^2 |
| Max. starting torque at 25°C | 1 | Ncm |
| Max. load on shaft | ||
| - With standard shaft | axial: 50 / radial: 200 | N |
| - With expanding shaft | axial: 10 / radial: 20 | N |
| Service life of ball bearings (at 10 N axial/radial load @ 3000 $rpm^{-1}$) | 25000 | h |
| Vibration, sinusoidal 100 Hz | 100 | ms^-2 |
| Radial impacts on the flange within 10 ms | 300 | ms^-2 |
| Protection | See option concerned | - |
| Relative humidity | 95 | % |
| Temperature range | See option concerned | - |
| Weight | approx. 0.4 | kg |
| Parameter | Value | Unit |
| Max. step frequency | 100 | kHz |
| Supply voltage | 10 ... 32 | V |
| Max. power consumption | 3.7 | W |
| Angular error | 10^-3 | rad |
| Pick-up code | Gray single-step | - |
| Transmitters | GaAlAs diodes | - |
| MTBF | 10^5 | h |

