We provide a fully compatible SSI encoder 1:1 replacement solution for the GM401.0122102 and GM401.A122102 models, designed for direct substitution in absolute multiturn positioning systems. This replacement is engineered to replicate the original encoder’s electrical interface, SSI timing behavior, and data structure, enabling installation without changes to PLC programs, drive parameters, or wiring layouts.
The encoder delivers absolute multiturn position feedback via a Synchronous Serial Interface, combining high singleturn resolution with reliable multiturn tracking across multiple revolutions. Stable code transmission and consistent sampling behavior ensure accurate and repeatable position data, even in applications with frequent acceleration, deceleration, or continuous operation. The supported coding structure allows smooth integration with standard industrial controllers and motion control platforms.
From a mechanical perspective, the encoder conforms to established industrial mounting standards, allowing 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 diagnostic functions enhance operational reliability and support preventive maintenance strategies.
This 1:1 replacement encoder is well suited for servo systems, automated machinery, and industrial positioning applications where precise absolute feedback, system stability, and long-term operational 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 |
