We developed a custom solution for 8.H120.2254.1024, for heavy motor and generator systems where 1024 PPR push-pull feedback must stay stable under 16 mm through-shaft mounting, short torque-arm restraint, M23 connector wiring, and EMC noise.

Model reading:

  • 2 = 70 mm torque arm
  • 2 = 16 mm through hollow shaft
  • 5 = push-pull with inverted signals, 10–30 VDC
  • 4 = radial M23 connector, 12-pin, reversed
  • 1024 = 1024 pulses per revolution

Typical production lead time: 15 working days.

At 1024 PPR, the system is not usually limited by pulse frequency first. The weak point is more often the 16 mm shaft fit, the 70 mm torque arm, the M23 shield contact, or the grounding path between motor frame and cabinet.

Where the System Fails First

The 16 mm through hollow shaft must stay concentric. A small shaft fit error will normally show up as A/B phase jitter before the encoder shows visible mechanical damage.

The 70 mm torque arm is compact, but it gives less mechanical tolerance than longer torque arms. If the arm is forced into position, housing stress can appear as unstable pulse timing under vibration.

The M23 connector improves replacement and service access, but it also makes connector shielding a critical point. Once the shield path is weak at the connector shell, the PLC may still see pulses, but A/B/0 edge timing becomes unreliable. The platform supports 300 kHz pulse frequency, while standard push-pull transmission is rated up to 150 m at 80 kHz.

Typical failure points:

  • Loose 16 mm through-shaft fit → phase jitter
  • Forced 70 mm torque arm → housing stress
  • Weak M23 shield contact → unstable A/B/0 edges
  • Poor grounding → reference signal 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 work when shaft fit, torque-arm geometry, and connector shielding are controlled.

Installation Notes

  • Keep the model format as 8.H120.2254.1024
  • Check the 16 mm through hollow shaft fit before checking electronics
  • Install the 70 mm torque arm without side-loading the housing
  • Verify M23 connector shield continuity
  • 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.H120.2254.1024
  • 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: Radial M23 connector, 12-pin
  • 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