We developed a custom solution for 8.H120.455A.1024.0020, for heavy motor and generator systems where 1024 PPR push-pull feedback must stay stable under 25 mm through-shaft mounting, long torque-arm restraint, 2 m cable routing, and shaft-current risk.

Model reading:

  • 4 = 150 mm torque arm
  • 5 = 25 mm through hollow shaft
  • 5 = push-pull with inverted signals, 10–30 VDC
  • A = radial PVC cable, special length
  • 1024 = 1024 pulses per revolution
  • 0020 = 2 m cable length

Typical production lead time: 15 working days.

At 1024 PPR, the counter is usually not the first weak point. The real risk is mechanical: 25 mm shaft fit, torque-arm geometry, cable shielding, and grounding continuity. If the hollow shaft runs with slight eccentricity, the encoder will normally show phase jitter before any visible mechanical failure appears.

Where the System Fails First

The 25 mm through hollow shaft gives good installation flexibility on large machine shafts, but it does not tolerate poor fit. A loose shaft interface turns motor vibration into A/B phase instability.

The 150 mm torque arm gives more reach than shorter arms, but it must not be used to force the encoder body into alignment. Once the torque arm is preloaded, the housing follows machine vibration and the signal becomes unstable under load.

The 2 m cable is short, so cable length is not the limiting factor. The field risk is routing. If the cable runs near inverter output lines or the shield is not continuous into the cabinet, the push-pull output may still switch, but the edge timing becomes unreliable at the counter input. Standard push-pull transmission is rated up to 150 m at 80 kHz, assuming proper shielding and grounding.

Typical failure points:

  • Loose 25 mm hollow-shaft fit → A/B phase jitter
  • Forced 150 mm torque arm → housing oscillation
  • Poor cable shielding → unstable pulse edges
  • Grounding error → reference signal noise
  • Counter filtering mismatch → false counts
  • Shaft current without isolation control → feedback damage risk

Mechanical Boundary

H120 is designed for large electric machines, with 2.5 kV bearing isolation, HD-Safety-Lock™, double shaft protection, IP67, seawater-resistant housing, 475 N radial load, 375 N axial load, and -40 °C to +100 °C operation. These margins only help when the shaft fit, torque-arm installation, cable shielding, and grounding path are controlled.

Installation Notes

  • Keep the model format as 8.H120.455A.1024.0020
  • Check the 25 mm through hollow shaft fit before checking electronics
  • Install the 150 mm torque arm without side-loading the housing
  • Route the 2 m cable away from inverter and motor power wiring
  • Keep shielding continuous from encoder to cabinet
  • Confirm counter settings at real RPM and 1024 PPR
  • Check shaft-current isolation before replacing the encoder

Key Data

  • Model: 8.H120.455A.1024.0020
  • Type: Heavy-duty through hollow shaft incremental encoder
  • Resolution: 1024 PPR
  • Output: Push-pull with inverted signals
  • Supply voltage: 10–30 VDC
  • Max frequency: 300 kHz
  • Max cable length: 150 m at 80 kHz
  • Shaft: 25 mm through hollow shaft
  • Mounting: 150 mm torque arm
  • Connection: 2 m radial PVC cable
  • Protection: IP67
  • Temperature: -40 °C to +100 °C
  • Shaft load: 475 N radial / 375 N axial
  • Shock: 2000 m/s², 6 ms
  • Vibration: 150 m/s², 10–2000 Hz

发“下一条”，我继续写 8.H120.356A.1024.0020。