We developed a custom solution for 8.H120.326A.2048.0020, for heavy motor and generator systems where 2048 PPR power push-pull feedback must stay stable under 16 mm through-shaft mounting, 2 m cable routing, torque-arm restraint, and EMC noise.

Model reading:

  • 3 = 100 mm torque arm
  • 2 = 16 mm through hollow shaft
  • 6 = power push-pull with inverted signals, 10–30 VDC
  • A = radial PVC cable, special length
  • 2048 = 2048 pulses per revolution
  • 0020 = 2 m cable length

Typical production lead time: 15 working days.

At 2048 PPR, the first weak point is normally not the optical sensor. It is the combination of shaft fit, counter margin, cable shielding, grounding, and torque-arm geometry. The power push-pull output gives stronger load capacity than standard push-pull, but it does not protect the system from bad routing or broken shield continuity.

Where the System Fails First

The 16 mm through hollow shaft must stay concentric. If the shaft fit is loose or the torque arm is forced, the encoder will usually show A/B phase jitter before any visible mechanical damage appears.

For the power push-pull output, the datasheet allows up to 350 m at 100 kHz. This model has only a 2 m radial cable, so cable length is not the main risk. The real risk is cable path quality. If the cable runs near inverter output lines or motor power wiring, the stronger output stage still cannot guarantee clean edge timing at the counter input.

Typical failure points:

  • Loose 16 mm shaft fit → A/B phase jitter
  • Forced 100 mm torque arm → housing oscillation
  • Poor cable shielding → unstable pulse edges
  • Counter margin too low → missed counts
  • Grounding error → reference signal noise
  • Shaft current without isolation control → feedback damage risk

Mechanical Boundary

H120 is built for heavy 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 matter when the hollow shaft, torque arm, and cable shielding are installed correctly.

Installation Notes

  • Keep the model format as 8.H120.326A.2048.0020
  • Check the 16 mm through hollow shaft fit before checking electronics
  • Install the 100 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 capacity at real RPM and 2048 PPR
  • Check shaft-current isolation before replacing the encoder

Key Data

  • Model: 8.H120.326A.2048.0020
  • Type: Heavy-duty through hollow shaft incremental encoder
  • Resolution: 2048 PPR
  • Output: Power push-pull with inverted signals
  • Supply voltage: 10–30 VDC
  • Max frequency: 300 kHz
  • Max cable length: 350 m at 100 kHz
  • Shaft: 16 mm through hollow shaft
  • Mounting: 100 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