We developed a custom solution for 8.H120.4B5K.4096, for heavy motor and generator systems where 4096 PPR push-pull feedback must stay stable under blind hollow shaft mounting, high pulse density, terminal-box wiring, and EMC noise.

Model reading:

  • 4 = 150 mm torque arm
  • B = 16 mm blind hollow shaft with central fastening
  • 5 = push-pull with inverted signals, 10–30 VDC
  • K = rotatable terminal box
  • 4096 = 4096 pulses per revolution

Typical production lead time: 15 working days.

At 4096 PPR, the encoder is no longer limited mainly by mechanical strength. The first weak point is usually counter bandwidth, edge quality, terminal-box shielding, and shaft micro-movement. High resolution only works when the control system can still read clean A/B/0 edges at real motor speed.

Where the System Fails First

The 16 mm blind hollow shaft must be centered and fastened correctly. If the central fastening is uneven or the shaft fit is loose, the first symptom is normally phase jitter, not visible bearing damage.

For standard push-pull output, the H120 platform supports 300 kHz maximum pulse frequency, but standard push-pull transmission is limited to 150 m at 80 kHz. With 4096 PPR, that cable and counter margin must be checked before commissioning. A weak PLC counter or poor shield path will lose pulses before the encoder electronics fail.

Typical failure points:

  • Counter bandwidth too low → missed pulses
  • Loose blind-shaft fit → A/B phase jitter
  • Poor central fastening → shaft micro-movement
  • Shield break in terminal box → unstable pulse edges
  • Grounding error → reference signal noise
  • 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 are strong, but they do not compensate for poor shaft fit, forced torque-arm installation, or broken shield grounding.

Installation Notes

  • Keep the model format as 8.H120.4B5K.4096
  • Confirm counter capacity at real RPM and 4096 PPR
  • Control the 16 mm blind hollow shaft fit and central fastening
  • 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
  • Check shaft-current isolation before replacing the encoder

Key Data

  • Model: 8.H120.4B5K.4096
  • Type: Heavy-duty blind hollow shaft incremental encoder
  • Resolution: 4096 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 blind hollow shaft with central fastening
  • 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