We developed a custom solution for 8.H120.4B6A.1024.0020, for heavy motor and generator systems where 1024 PPR power push-pull feedback must stay stable under blind hollow shaft mounting, long torque-arm restraint, 2 m cable routing, and shaft-current risk.

Model reading:

  • 4 = 150 mm torque arm
  • B = 16 mm blind hollow shaft with central fastening
  • 6 = power 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, counter overload is not usually the first failure point. The real weak point is the blind-shaft seating and shield path. If the 16 mm blind hollow shaft is not seated correctly, the encoder does not fail immediately; it first shows phase jitter, unstable speed value, or intermittent reference behavior.

Where the System Fails First

The 16 mm blind hollow shaft depends on correct central fastening. Uneven clamping creates micro-movement. In a large motor, that micro-movement becomes a signal problem before it becomes visible mechanical damage.

The 150 mm torque arm gives installation reach, but it must not be used to pull the housing into position. A forced torque arm transfers frame vibration into the encoder body and turns a mechanical tolerance problem into unstable A/B/0 timing.

This model uses power push-pull output. Compared with standard push-pull, it gives stronger load capacity and supports longer cable runs; the datasheet gives 350 m at 100 kHz for the power-type output. But with this 2 m cable version, cable length is not the main risk. Cable routing and shielding are. Once the cable passes near inverter output or the shield is broken at the cabinet, the counter may still see voltage transitions, but the edge timing is no longer trustworthy.

Typical failure points:

  • Uneven blind-shaft fastening → A/B phase jitter
  • Forced 150 mm torque arm → housing vibration
  • 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 built 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 are useful only when shaft fit, torque-arm geometry, shielding, and grounding are correct.

Installation Notes

  • Keep the model format as 8.H120.4B6A.1024.0020
  • Check the 16 mm blind hollow shaft fit before checking electronics
  • Use correct central fastening; avoid uneven clamping force
  • 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
  • Check shaft-current isolation before replacing the encoder

Key Data

  • Model: 8.H120.4B6A.1024.0020
  • Type: Heavy-duty blind hollow shaft incremental encoder
  • Resolution: 1024 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 blind hollow shaft with central fastening
  • 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.H120.455A.1024.0020。