We provide a reliable SSI encoder 1:1 replacement solution for the GM401.0101102 and GM401.A101102 models, developed for direct substitution in absolute multiturn positioning systems. This replacement is engineered to replicate the original encoder’s electrical behavior, SSI communication timing, and functional logic, allowing installation without changes to PLC programs, drive parameters, or wiring concepts.
The encoder delivers absolute multiturn position feedback via a Synchronous Serial Interface, combining precise singleturn measurement with dependable multiturn tracking. Stable data transmission and consistent signal timing ensure accurate position information even in applications with frequent speed variations or continuous operation. The supported coding structure allows smooth integration with standard industrial controllers and motion platforms.
Mechanically, the encoder is designed around established industrial mounting standards, enabling straightforward installation on existing shafts and flanges. Its internal architecture incorporates continuous self-diagnostic monitoring, including checks for code stability, signal frequency limits, and internal electronic status. These features improve operational reliability and help identify potential issues before they impact system performance.
This 1:1 replacement encoder is well suited for servo drives, automated machinery, and industrial positioning systems where accurate absolute feedback and long-term stability are essential.
Technical data
| Parameter | Value |
| Supply voltage | 10...30 VDC with reverse voltage protection |
| Current consumption | Max. 50 mA (w/o load) for 24 VDC |
| SSI pulse frequency | 62.5 kHz up to 1.5 MHz |
| Mono-flop time | 20 μs |
| Pulse space | Min. 25 μs |
| Code switching speed for sampling | 800 kHz |
| Deviation of sampling measuring step | 0.025 degree at 400 kHz 0.05 degree at 800 kHz |
| Electric connector | The electric connector must not be plugged on or removed whilst under voltage. |
| Parameter | Value |
| RPM value | mechanical: Max. 10,000 RPM electrical: Max. 6,000 RPM |
| Anlauf-Drehmoment | w/o seal (IP54): < 0.010 Nm with seal (IP65): < 0.015 Nm |
| Shaft loading | axial: < 20 N radial: < 40 N |
| Inertia torque | 2 x 10⁻⁶ kgm² |
| Material | Housing: Steel Flange: Aluminium |
| Weight | Approximately 400 g |
| Parameter | Value |
| Ambient temperature | -20...+60 °C |
| Storage temperature | -20...+70 °C |
| Protection to | Shaft w/o seal: IP 54 Shaft with seal: IP 65 |
| Relative humidity | Max. 95 %, non-condensing |
| Endurance - Vibration | IEC 68 Section 2 - 6 (≤100 m/s² / 16-2000 Hz) |
| Endurance - Shock | IEC 68 Section 2 - 27 (≤2000 m/s² / 6 ms) |
| Interference immunity | EN 50082-2 EN 61000-4 - 2 to 4 Severity grade 3 |
| Emmited interference | EN 50081-2 |
