Technical Description: Heidenhain 336976-16 (ERN 1381)
The Heidenhain 336976-16 is a high-performance incremental rotary encoder from the ERN 1300 series. The ERN 1381 is the industry standard for feedback in AC servo motors and machine tool spindles. It provides precise 1Vpp sinusoidal signals, which are highly regarded for their ability to be interpolated at the CNC control or drive level, allowing for incredibly smooth motion control and high-resolution speed measurement.
Signal Precision and Noise Immunity
This encoder features a line count of 2048, providing a robust base for high-resolution feedback. The 1Vpp sinusoidal output is significantly more resistant to electrical noise than standard TTL signals, making the 336976-16 the preferred choice for large industrial cabinets with significant VFD interference. The tapered shaft (1:10) provides a rigid mechanical connection, ensuring that the optical scanning unit follows the motor’s movement with zero slip.
Key Technical Characteristics
- Part Number: 336976-16.
- Model: ERN 1381.
- Output Signal: 1Vpp (Sinusoidal).
- Line Count: 2048.
- Shaft Type: Tapered shaft 1:10 (9.25mm diameter).
- Max Operating Speed: 15,000 rpm.
- Power Supply: 5V DC ± 5%.
- Connection: 12-pin PCB connector.
Industrial Durability and Maintenance
The ERN 1381 is built to withstand the demanding conditions of modern factory floors. Its built-in stator coupling absorbs motor vibrations and compensates for thermal expansion of the motor shaft. With an operating temperature range of up to 120°C, the 336976-16 is often found inside the motor housing of leading brands like Siemens, Fanuc, and Bosch Rexroth. Its long-term reliability is backed by Heidenhain’s proprietary optical scanning technology.
| Feature | Specification |
| System Accuracy | ±20″ |
| Cut-off Frequency | 210 kHz (-3 dB) |
| Vibration Resistance | 300 m/s² (55 to 2000 Hz) |
Technical Note
When replacing a 336976-16, ensure that the tapered shaft is seated with the correct torque to prevent axial displacement. This encoder is often used in «closed-loop» systems where the CNC control continuously monitors the sine/cosine phases to maintain sub-micron positioning accuracy.
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