We provide a dedicated SSI encoder 1:1 replacement solution for the GM401.020A002 and GM401.A20A002 models, designed for seamless integration into existing absolute multiturn encoder applications. This replacement is engineered to replicate the original interface characteristics and operational behavior, allowing installation without modifications to PLC programs, drive settings, or wiring configurations.
The encoder delivers absolute multiturn position feedback via a Synchronous Serial Interface, combining high singleturn resolution with reliable multiturn tracking. Stable data transmission and consistent signal timing ensure accurate and repeatable position information, even in applications with dynamic motion profiles or continuous operation. Support for standard code formats enables compatibility with common industrial control systems.
Mechanically, the encoder follows established industrial mounting standards, enabling direct installation on existing shafts and flanges. Its internal design includes continuous self-diagnostic monitoring, such as checks on code continuity, signal frequency limits, and internal electronic status. These functions enhance operational reliability and support preventive maintenance strategies.
This 1:1 replacement is well suited for automated machinery, servo-driven systems, and industrial positioning equipment where accurate absolute feedback and long-term stability are critical.
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 |
