We provide a precise SSI encoder 1:1 replacement solution for the GM401.012A102 and GM401.A12A102 models, intended for direct integration into existing absolute multiturn motion control systems. This replacement is designed to mirror the original encoder’s electrical interface, SSI timing, and functional logic, allowing installation without changes to controller programs, parameter settings, or wiring layouts.
The encoder delivers absolute multiturn position feedback via a Synchronous Serial Interface, combining high singleturn resolution with reliable multiturn counting. Stable data transmission and consistent code behavior ensure accurate position information even in applications with rapid acceleration, frequent direction changes, or continuous operation. The supported code formats and sampling characteristics enable smooth communication with standard industrial controllers and drives.
Mechanically, the encoder conforms to established industrial mounting standards, enabling straightforward installation on existing shafts and flanges. The internal design incorporates continuous self-diagnostic monitoring, including supervision of code continuity, signal frequency limits, and internal electronic status. These diagnostic capabilities support early fault detection and contribute to improved system uptime.
This 1:1 replacement solution is well suited for servo systems, automated machinery, and industrial positioning applications where precise absolute feedback, operational stability, and long-term reliability 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 |
