HEIDENHAIN ERN 1381.026-2048 Incremental Rotary Encoder

Technical Specifications

Model：ERN 1381.026-2048 Brand：HEIDENHAIN Product Type: Bearing-integrated incremental optical rotary encoder

Module Feature

Function: HEIDENHAIN ERN 1381.026-2048 is incremental rotary encoder equipped with built-in precision bearing. It outputs ~1.05Vpp sine/cosine A/B/Z incremental measuring signals, 2048 lines per revolution. It adopts 9.25mm 1:10 tapered shaft with expanding ring friction locking design, with M10 and M6 withdrawal thread. Max mechanical rotational speed up to 15000 rpm, operating temperature range -40℃ ~ +120℃. Widely used on heavy horizontal boring mills, machining centers for spindle and servo motor closed-loop position & speed measurement.

Measuring principle: Incremental optical scanning Incremental lines: 2048 lines per revolution Output Signal: ~1.05 Vpp sine/cosine incremental signals + reference mark Z pulse Shaft specification: 1:10 tapered shaft, functional diameter 9.25mm, with withdrawal thread M10/M6 Onboard components: Optical grating disc, scanning assembly, built-in bearing, metal housing,14-pin double-row locking connector

LED indicators: Not equipped on encoder body

Hardware self-diagnosis

Signal amplitude test, reference mark detection, bearing noise inspection, signal waveform monitoring

Programming software

HEIDENHAIN diagnostic software for encoder parameter reading and signal waveform analysis

Electrical Parameters

Supply voltage: 5VDC ±5% Power consumption: ≤180mA

Mechanical & Structure

Mounting: 1:10 tapered shaft fitted onto motor rotor Protection class: IP40 (housing)

Environmental

Operating temperature: -40℃ ~ +120℃ Ambient humidity: 5~85% non-condensing Certification: CE Status: HEIDENHAIN heavy-duty incremental rotary encoder

System compatibility

Compatibility description: ERN1381 series encoder compatible with HEIDENHAIN EXE interpolation units and CNC drives supporting 1Vpp sinusoidal input. Suitable for Fives Giddings & Lewis PIC900 CNC heavy boring mill spindle and feed axis.

Function

Function description: ERN 1381.026-2048 is incremental rotary encoder manufactured by HEIDENHAIN. It delivers high-quality sine/cosine incremental signals for electronic interpolation to achieve ultra-high resolution. Reference mark Z pulse establishes machine datum after power cycle. The 1:10 taper shaft and friction locking structure ensures reliable torque transmission. Withdrawal thread facilitates encoder disassembly from motor rotor. Compact metal housing withstands machine workshop vibration and high temperature. It is core measuring spare for heavy CNC boring mill closed-loop motion control.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off all power supply. Fit encoder tapered shaft onto motor rotor, tighten expanding locking ring. Connect shielded encoder cable to interpolation or CNC control unit. Adjust mounting alignment, lock all fasteners. Restore power, run signal amplitude test and reference mark detection test.

Interface

Interface list: 14-pin double-row locking connector, 5VDC power and ~1.05Vpp measuring signal terminals, no LED indicators on ERN 1381.026-2048.

Diagnostic

Troubleshooting: No measuring signal: Check 5V power supply, cable breakage or connector pin contact. Reference mark cannot be detected: Optical window contamination or shaft misalignment. Intermittent signal fluctuation: Vibration, loose taper locking ring or bearing deterioration.

Product Brief

Brief description: ERN 1381.026-2048 HEIDENHAIN bearing-integrated incremental rotary encoder with 1:10 tapered shaft,2048 lines and ~1.05Vpp sine/cosine output,with withdrawal thread,used for spindle and servo motor angular position and speed measurement of heavy CNC boring mill,rotary encoder spare.