HEIDENHAIN ERO 785 Incremental Modular Angle Encoder
The HEIDENHAIN ERO 785 is an incremental modular angle encoder with a circular scale on a hub and a scanning unit, for rotary axes that need a compact, high-speed angle measurement. Ask AMI about repair, replacement or sourcing for your exact unit; availability and the right replacement path are confirmed before quoting. This page does not claim stock. Legacy model: it is no longer listed in HEIDENHAIN's current modular angle encoder catalog.
Machine down? Call 1-888-354-2525.
Own a ERO 785 that has failed? Ask about repair options.
Representative ERO 785 image.
Technical data
| Model | ERO 785 |
|---|---|
| Type | Incremental modular angle encoder: circular scale with hub and scanning unit |
| Incremental signals | 1 Vpp |
| Line count | 36,000 |
| Reference mark | One |
| Cutoff frequency | -3 dB: 180 kHz |
| Recommended measuring step for position capture | 0.0001° |
| Hub inside diameter | 47.2 mm, 102.2 mm or 155.1 mm (indicate when ordering) |
| System accuracy | ±4.2 arc seconds (47.2 mm), ±3 (102.2 mm), ±2.2 (155.1 mm) |
| Accuracy of the graduation | ±3.7 arc seconds (47.2 mm), ±2.5 (102.2 mm), ±1.7 (155.1 mm) |
| Power supply | 5 V ±10%, max. 150 mA without load |
| Electrical connection | Cable 0.3 m with M23 flange socket (male) on the mounting base; max. cable length 150 m |
| Mechanical speed | Up to 8000 rpm (47.2 mm), 6000 rpm (102.2 mm), 4000 rpm (155.1 mm) |
| Moment of inertia of rotor | 620 x 10-6 kgm2 (47.2 mm); 3700 x 10-6 (102.2 mm); 26000 x 10-6 (155.1 mm) |
| Permissible axial motion of measured shaft | See scanning gap tolerance in the catalog dimension drawing |
| Vibration / shock | 100 m/s2 (55 to 2000 Hz) / 1000 m/s2 (6 ms) |
| Operating temperature | 0 to 50 °C (32 to 122 °F) |
| Protection | IP 00 |
| Weight | Scanning unit approx. 0.19 kg; circular scale with hub 0.46 kg (47.2 mm), 0.87 kg (102.2 mm), 2.6 kg (155.1 mm) |
Specifications from the manufacturer's July 2005 angle encoder catalog. Confirm the full ID number, interface and mounting dimensions from your encoder's nameplate before ordering; send the nameplate and we will confirm fit.
Catalog pages: ERO 785 and ERA 700 / ERA 800 series specifications (PDF, 8 pages).