We developed a custom solution for 8.H120.425K.1024, for heavy motor and generator systems where 1024 PPR push-pull feedback must stay stable under 16 mm through-shaft mounting, torque-arm movement, terminal-box wiring, and shaft-current risk.

Model reading:

  • 4 = 150 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 first weak point is usually not counter overload. It is the shaft fit, torque-arm restraint, terminal-box shield path, and grounding continuity. If the through shaft is loose or the torque arm is forced, the encoder normally shows A/B phase jitter before any visible mechanical failure.

Where the System Fails First

The 16 mm through hollow shaft must stay concentric with the motor shaft. A through-shaft structure is easier to mount than some blind-shaft layouts, but it is less forgiving when the machine shaft has runout or the housing is constrained by a stressed torque arm.

For standard push-pull output, the H120 platform supports 300 kHz maximum pulse frequency, with a typical cable-length boundary of 150 m at 80 kHz. In this terminal-box version, the field failure point is usually the shield connection inside the box, not the encoder electronics. Once the shield path floats, the PLC may still see voltage changes, but the timing of A/B/0 edges becomes unreliable.

Typical failure points:

  • Loose 16 mm through-shaft fit → phase jitter
  • Forced 150 mm torque arm → housing oscillation
  • Shield break in terminal box → unstable A/B/0 edges
  • Grounding error → reference pulse noise
  • Counter filtering mismatch → false counts
  • Shaft current without isolation control → feedback damage risk

Mechanical Boundary

H120 is built for large 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 shaft fit, torque-arm geometry, and grounding are controlled.

Installation Notes

  • Keep the model format as 8.H120.425K.1024
  • Check the 16 mm through hollow shaft fit before checking electronics
  • Install the 150 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
  • Verify shaft-current isolation before replacing the encoder

Key Data

  • Model: 8.H120.425K.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: 150 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