Application Scenarios
On a high-speed packaging line, a 845H-SJDZ24FWY2C was mounted directly to the main drive motor of a film-feed axis controlled by a PowerFlex 755 drive. The encoder‘s HTL differential outputs (A, /A, B, /B, Z, /Z) transmitted 1024 pulses per revolution over a 12-meter cable run through an electrically noisy cabinet, maintaining signal integrity where a previous single-ended encoder had produced position drift and intermittent drive faults. The 845H-SJDZ24FWY2C’s square flange and 3/8-inch keyed stainless steel shaft matched the motor‘s existing mounting interface, allowing direct replacement without adapter hardware. After commissioning, the drive’s position loop achieved stable operation at line speeds up to 1,500 RPM, and the IP66-rated shaft seal eliminated the moisture ingress failures that had plagued the previous encoder in the washdown-adjacent environment.
Parameter
| Parameter | Value / Description |
|---|---|
| Product Model | 845H-SJDZ24FWY2C |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Product Category | Optical Incremental Encoder (Bulletin 845H, Size 25) |
| Resolution | 1024 Pulses Per Revolution (PPR) |
| Output Configuration | Differential Line Driver, 5 VDC RS-422 compatible |
| Output Signals | A, /A, B, /B, Z, /Z (quadrature + complementary + gated zero index) |
| Quadrature Phase | 90° ±22°; Channel A leads B in CCW rotation |
| Power Supply | 8–24 VDC unregulated |
| Frequency Response | 210 kHz (data and zero index) |
| Operating Speed | 6000 RPM maximum |
| Shaft Configuration | 3/8 in. (9.517 mm) diameter, stainless steel |
| Shaft Loading | Axial: 89 N (20 lb); Radial: 178 N (40 lb) |
| Mounting | Square Flange (Size 25) |
| Connection Type | Radial (side) M12 connector, 8-pin A-coded, with mating connector |
| Housing Rating | NEMA Type 4, 13; IP66 (IEC 529) |
| Operating Temperature | 0°C to +60°C |
| Shock / Vibration | 50 g (11 ms) / 20 g (4–2000 Hz) |
| Weight | Approx. 0.48 kg |
