HEIDENHAIN ERN1381.001-20 Incremental Rotary Encoder

Technical Specifications

Model：ERN1381.001-20 Brand：HEIDENHAIN Product Type: Bearing-integrated incremental optical rotary encoder

Module Feature

Function: HEIDENHAIN ERN1381.001-20 incremental rotary encoder with built-in precision bearing. It generates 1Vpp sine/cosine incremental signals and reference mark Z pulse for angular position and rotational speed measurement. It adopts 1:10 tapered shaft with 9.25mm functional diameter for friction locking installation on spindle. The stator anti-rotation coupling can compensate axial installation tolerance up to ±0.5mm. Widely used on heavy horizontal boring mills, machining centers and high-performance servo drive systems.

Measuring principle: Incremental optical scanning Shaft specification: Tapered shaft 9.25mm, taper ratio 1:10 Output Signal: 1 Vpp sine/cosine incremental signals + reference mark Max mechanical speed: 15000 rpm Onboard components: Optical grating disc, scanning assembly, precision bearing, metal housing, 14-pin connector

LED indicators: POWER, SIG, FAULT diagnostic lights

Hardware self-diagnosis

Signal amplitude monitoring, reference mark detection, signal integrity inspection

Programming software

HEIDENHAIN diagnostic software for signal quality verification and mounting adjustment

Electrical Parameters

Supply voltage: 5VDC ±5% Power consumption: Max 130mA

Mechanical & Structure

Mounting: 1:10 tapered shaft fitted directly onto spindle 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 belongs to HEIDENHAIN ERN1300 encoder family, compatible with HEIDENHAIN EXE interpolation units. Suitable for Fives Giddings & Lewis PIC900 CNC heavy boring mill spindle and servo axis.

Function

Function description: ERN1381.001-20 is incremental rotary encoder manufactured by HEIDENHAIN. Built-in bearing and stator coupling reduce mechanical installation stress and backlash. Reference mark pulse is required for axis homing after power-up. Compact housing and robust mechanical structure resist high speed and workshop vibration. It is high precision rotary measuring spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off encoder 5VDC power. Mount ERN1381 encoder onto tapered spindle shaft and lock friction assembly. Connect shielded encoder cable to interpolation or servo control unit. Restore power, verify LED indicators, run signal test and spindle homing calibration.

Interface

Interface list: 14-pin connector, 5VDC power and 1Vpp incremental signal terminals,on-board POWER / SIG / FAULT LED indicators for HEIDENHAIN ERN1381.001-20.

Diagnostic

Troubleshooting: No encoder signal: Check 5V supply, cable breakage or connector pin damage. FAULT LED lit: Low signal amplitude, grating contamination or shaft misalignment. Intermittent position jump: Vibration, loose taper locking or bearing wear.

Product Brief

Brief description: ERN1381.001-20 HEIDENHAIN bearing-integrated incremental rotary encoder with 1:10 tapered shaft and 1Vpp output,provides angular position and speed feedback for heavy CNC boring mill spindle and servo motor closed-loop control,rotary encoder spare.