For 8.H120.355A.2048.0020, EncoderWorks can provide a custom compatible replacement focused on 10–30 V push-pull receiver matching, 2048 PPR scaling, Ø25 mm through-hollow-shaft fit, and 100 mm torque-arm installation. This model should not be treated like the Ø16 or Ø20 bore versions. The larger through shaft, torque-arm geometry, cable assignment, and A/B/0 inverted-channel mapping must match the original machine.
The 8.H120.355A.2048.0020 is a heavy-duty optical incremental hollow-shaft encoder configuration with 2048 PPR, push-pull output with inverted signals, 10–30 VDC supply, Ø25 mm through hollow shaft, 100 mm torque arm, radial PVC cable connection, and special 2 m cable length. The controller must keep the same quadrature evaluation, reference-pulse logic, and 2048 PPR scaling.
The first failure boundary is push-pull signal integrity. A, B, 0 and inverted A/B/0 must be wired by signal function. If receiver threshold, input filtering, cable shielding, channel polarity, or reference-pulse handling is wrong, the drive may detect switching signals while still losing counts or reading the wrong direction.
This replacement fails when A/B/0 signals are present, but the controller loses counts or reads the wrong motion value because push-pull output behavior, 2048 PPR scaling, 2 m cable assignment, inverted-channel mapping, or reference-pulse handling does not match the original encoder.
The second boundary is heavy-duty through-shaft mechanics. The Ø25 mm shaft, 100 mm torque arm, clamp-ring torque, shaft fit, radial load, axial load, IP67 sealing, and cable strain must be checked together. The torque arm should prevent housing rotation without forcing radial or angular preload into the bearing system.
The replacement decision should first confirm 2048 PPR scaling, 10–30 V push-pull receiver compatibility, A/B/0 plus inverted channel mapping, 300 kHz frequency margin, radial 2 m cable assignment, Ø25 mm through-hollow-shaft fit, 100 mm torque-arm geometry, clamp-ring tightening, IP67 sealing, shield grounding, cable routing, and shaft-load limits. EncoderWorks treats 8.H120.355A.2048.0020 as an industrial encoder custom compatible solution where push-pull signal integrity and Ø25 hollow-shaft installation decide field reliability.
Typical production lead time: 15 working days.
Key Data
| Item | Data |
|---|---|
| Model | 8.H120.355A.2048.0020 |
| Encoder type | Heavy-duty incremental hollow-shaft encoder |
| Detection type | Optical |
| Pulse count | 2048 PPR |
| Output circuit | Push-pull with inverted signals |
| Signal output | A, B, 0 and inverted A, B, 0 |
| Supply voltage | 10–30 VDC |
| Max pulse frequency | 300 kHz |
| Shaft type | Through hollow shaft |
| Shaft size | Ø25 mm |
| Mounting | 100 mm torque arm |
| Connection | Radial PVC cable, special length |
| Cable length | 2 m |
| Protection class | IP67 |
| Main engineering anchor | Push-pull output and Ø25 hollow shaft |
| Main failure boundary | Wrong channel mapping, receiver mismatch, scaling error, torque-arm preload |
