Product Overview: Heidenhain 324952-12 (ERN 1381)
The Heidenhain 324952-12 is a high-performance incremental rotary encoder belonging to the legendary ERN 1300 series. Specifically designated as an ERN 1381, this encoder is an industry standard for providing high-resolution speed and position feedback in AC servo motors and machine tool spindles. It utilizes advanced optical scanning technology to deliver precise 1Vpp sinusoidal signals, ensuring smooth motion control even at high rotational speeds.
Technical Specifications and Signal Quality
The ERN 1381 features a line count of 2048, providing a robust signal for interpolation within CNC controllers. The 1Vpp interface is highly regarded for its high noise immunity and its ability to be interpolated into much higher resolutions at the drive level. This specific variant comes with a tapered shaft (1:10), ensuring a rigid, slip-free mechanical connection to the motor shaft, which is essential for high-dynamic applications.
Key Technical Characteristics
- Part Number: 324952-12.
- 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%.
- Protection: IP40 (stator side), IP64 (housing side).
Industrial Applications and Durability
Heidenhain’s ERN series is built to withstand the rigors of industrial machine rooms. The 324952-12 features a built-in stator coupling, which compensates for axial play and radial runout while maintaining high measurement accuracy. This makes it an ideal replacement part for servo motors used in high-precision milling, turning, and automated assembly equipment. Its long-term reliability is backed by a robust optical system that remains stable under varying thermal conditions.
| Feature | Specification |
| System Accuracy | ±20″ |
| Cut-off Frequency | 210 kHz |
| Operating Temperature | -40°C to +120°C |
Frequently Asked Questions
Can I use this to replace an ERN 1387? No, the ERN 1387 has commutation signals (Z1 track) which the 1381 lacks. Is the cable included? This part number usually refers to the encoder unit with a PCB connector; separate cables are required based on your machine’s layout.
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