We developed a custom solution for 8.H120.225K.1024, for heavy motor and generator systems where 1024 PPR push-pull feedback must stay stable under through-shaft mounting, torque-arm restraint, terminal-box wiring, and shaft-current risk.

Model reading:

  • 2 = 70 mm torque arm
  • 2 = 16 mm through hollow shaft
  • 5 = push-pull with inverted signals, 10–30 VDC
  • K = rotatable terminal box
  • 1024 = 1024 pulses per revolution

Typical production lead time: 15 working days.

At 1024 PPR, the counter load is normally manageable. The real weak point is usually the 16 mm through hollow shaft fit, the 70 mm torque arm, and the terminal-box shield path. If the shaft fit is loose or the torque arm is forced, the first symptom is often A/B phase jitter, not immediate encoder failure.

Where the System Fails First

The through hollow shaft gives direct motor-shaft mounting, but it also makes concentricity critical. The torque arm should stop housing rotation without pulling the encoder sideways. A short torque arm gives a compact installation, but it is less forgiving when the machine frame vibrates.

For standard push-pull output, the H120 platform supports 300 kHz pulse frequency and up to 150 m cable length at 80 kHz. In this terminal-box version, the cable itself is not the only risk. Most field instability starts when shield continuity is broken inside the terminal box or grounding floats between the motor frame and the control cabinet.

Typical failure points:

  • Loose 16 mm through-shaft fit → phase jitter
  • Forced 70 mm torque arm → housing stress
  • Poor terminal-box shielding → unstable A/B/0 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 heavy machines: 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 hollow shaft, torque arm, and grounding path are correctly installed.

Installation Notes

  • Keep the model format as 8.H120.225K.1024
  • Control the 16 mm through hollow shaft fit before checking electronics
  • Install the 70 mm torque arm without side-loading the housing
  • Keep terminal-box shield continuity intact
  • Separate encoder wiring from inverter and motor power cables
  • Confirm counter settings at real RPM and 1024 PPR
  • Check shaft-current isolation before replacing the encoder

Key Data

  • Model: 8.H120.225K.1024
  • 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: 16 mm through hollow shaft
  • Mounting: 70 mm torque arm
  • Connection: Rotatable terminal box
  • 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