Product Overview: Heidenhain 728255-01 (EQN 1325)
The Heidenhain 728255-01 is a high-precision absolute multiturn rotary encoder from the EQN 1300 series. Specifically categorized as an EQN 1325, this encoder is an industry benchmark for providing absolute position feedback in high-performance servo motors and machine tools. It utilizes the EnDat 2.1 interface, allowing for purely digital absolute position data transmission combined with incremental 1Vpp signals for high-dynamic control loops.
Technical Specifications and Communication
The EQN 1325 offers an absolute resolution of 13 bits (8192 positions per revolution) and can track up to 4096 revolutions (12 bits) through its multiturn functionality. This absolute measurement principle ensures that the machine «knows» its exact position immediately upon power-up, eliminating the need for reference runs (homing). The EnDat 2.1 interface is highly regarded for its reliability and ability to transmit motor-specific parameters stored within the encoder’s internal memory.
Key Technical Characteristics
- Part Number: 728255-01.
- Model: EQN 1325.
- Interface: EnDat 2.1 (with 1Vpp incremental signals).
- Resolution (Singleturn): 13 Bit (8192 positions).
- Multiturn Range: 12 Bit (4096 revolutions).
- Shaft Type: Tapered shaft 1:10 (9.25mm diameter).
- Power Supply: 3.6V to 14V DC.
- Line Count: 512.
Mechanical Integrity and Performance
Built to withstand the thermal and mechanical stresses of modern industrial environments, the 728255-01 features an integrated stator coupling that compensates for axial play and radial runout. The optical scanning technology, based on Heidenhain’s DIADUR process, provides extreme resistance to vibration and ensures high signal quality across the entire operating temperature range. It is a critical component for CNC systems such as Siemens Sinumerik or Heidenhain TNC.
| Characteristic | Detail |
| System Accuracy | ±20″ |
| Max Operating Speed | 12,000 rpm |
| Operating Temp | -40°C to +115°C |
Frequently Asked Questions
Is the 728255-01 compatible with older drives? It is compatible with any drive that supports the EnDat 2.1 or 2.2 protocol. Does it require a specific cable? Yes, a 12-pin PCB connector is used, requiring high-quality shielded cables to maintain signal integrity.
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