We developed a custom solution for the 20-2951-80 encoder, intended for systems where 80 PPR incremental feedback must remain stable under low-speed motion control, compact equipment installation, and industrial EMC conditions. This configuration uses a rectangular die-cast zinc housing, Ø6 mm solid shaft, square flange, M16 5-pin connector, and 10–30 V push-pull incremental output. It is not an absolute encoder and it is not a fieldbus device. It is a low-frequency pulse-feedback solution where signal edge stability, grounding quality, and A/B phase integrity determine whether the pulse stream remains usable. Typical production lead time: 15 working days.

Custom Solution Photos

20-2951-80 Low PPR Incremental Encoder-EncoderWorks
20-2951-80 Low PPR Incremental Encoder-EncoderWorks

Stable operation depends on rigid mounting, shaft alignment, connector stability, and clean A/B pulse transmission.

System Limits

  • Weak grounding or poor shielding → unstable low-speed pulse detection
  • Mechanical vibration → pulse jitter at low rotational speed
  • IP40 protection → unsuitable for coolant or washdown areas

This model uses A/B/0 push-pull incremental output with a maximum output frequency of 160 kHz, but at 80 PPR, the system focus shifts away from counter overload and toward stable low-speed pulse recognition. Low pulse density reduces PLC counter load significantly, but unstable grounding or vibration can still create false edges or pulse jitter during slow motion.

Compared with high-PPR configurations, the 80 PPR version is more tolerant of lower-performance counters and simpler control systems, making it suitable for general speed indication and moderate positioning tasks rather than precision interpolation.

Installation and Wiring Constraints

  • Wire GND / +Ub / A / B / 0 correctly
  • Keep signal cable separated from inverter and motor power wiring
  • Maintain shaft load within 10 N axial / 10 N radial
  • Keep rotational speed within 3000 rpm
  • Use rigid mounting because low-speed vibration directly affects pulse stability

Failure boundary:

  • Poor grounding → unstable low-speed counting
  • Mechanical vibration → pulse jitter
  • Wrong A/B interpretation → reversed direction
  • Moisture exposure → reduced reliability due to IP40 limitation

Replacement and Interface Mapping

  • Suitable for 80 PPR low-speed incremental feedback systems
  • Applicable where push-pull output, compact rectangular housing, and moderate PLC counter performance are required
  • Not suitable for high-resolution positioning, fieldbus communication, or wet environments
  • Best used in systems prioritizing stable low-speed feedback over fine interpolation

Key Data

  • Model: 20-2951-80
  • Type: Incremental encoder
  • Pulse count: 80 PPR
  • Output: Push-pull A/B/0
  • Supply voltage: 10–30 VDC
  • Max frequency: 160 kHz
  • Connector: M16 5-pin
  • Shaft: Ø6 mm
  • Housing: Powder-coated die-cast zinc
  • Flange: Square flange
  • Protection: IP40
  • Max speed: 3000 rpm
  • Operating temperature: -20 °C to +60 °C
  • Weight: Approx. 480 g