HEIDENHAIN ERN1387.001 Rotary Encoder

Technical Specifications

Model： ERN1387.001-20

Brand： HEIDENHAIN

Product Type: Bearing-integrated incremental rotary encoder for synchronous servo motor

Module Feature:

Function: HEIDENHAIN ERN1387.001-20 incremental rotary encoder with built-in precision bearing. It outputs 1Vpp sine/cosine incremental signals plus integrated commutation tracks for motor rotor angle detection. Provides high resolution position and speed feedback for closed-loop control of feed or spindle axes on heavy horizontal boring mills and large machining centers.

Measuring principle: Incremental optical scanning Line count: 2048 lines per revolution Output Signal: 1 Vpp sinusoidal sine/cosine signals + commutation signals Onboard components: DIADUR grating disc, optical scanning assembly, precision bearing, tapered shaft, 14-pin M23 flange connector, metal housing

LED indicators: POWER, SIG, FAULT diagnostic lights

Hardware self-diagnosis: Signal amplitude monitoring, scanning signal integrity check

Programming software: HEIDENHAIN proprietary diagnostic software for signal amplitude inspection

Electrical Parameters

Supply voltage: 5VDC ±5%

Power consumption: Max 2.9W

Mechanical & Structure:

Mounting: Direct mounting on servo motor via stator coupling Shaft: Tapered shaft Protection class: IP40 (encoder housing)

Environmental:

Operating temperature: -40℃ ~ +120℃

Ambient humidity: 5~85% non-condensing

Certification: CE

Status: HEIDENHAIN legacy incremental rotary encoder

System compatibility

Compatibility description: ERN1387.001-20 belongs to HEIDENHAIN ERN1300 rotary encoder family. 1Vpp sinusoidal output compatible with HEIDENHAIN EXE interpolation units and Fives Giddings & Lewis PIC900 CNC system. Widely applied on heavy CNC boring mill servo feed motors.

Function

Function description: ERN1387.001-20 is bearing integrated incremental rotary encoder manufactured by HEIDENHAIN. It is installed on synchronous servo motor end using stator coupling. Optical grating generates high precision sine/cosine incremental signals together with motor commutation signals. It feeds back rotor angular position and rotation speed to CNC and servo drive, enabling precise vector control of servo motor. Metal housing protects internal optical components from workshop dust and oil mist. Reference mark pulse required for homing after power-up. It is servo motor position measuring spare for heavy CNC boring mills.

Installation

Installation steps: Follow lockout/tagout safety procedure before installation. Cut off encoder 5VDC power. Mount encoder on servo motor flange, install stator coupling and adjust air gap. Connect shielded encoder cable to interpolation unit or servo drive. Restore power, verify POWER and SIG LED indicators, run encoder diagnostic and check position reading.

Interface

Interface list: 14-pin M23 flange connector, 5VDC power terminal,on-board POWER / SIG / FAULT LED indicators for HEIDENHAIN ERN1387.001-20.

Diagnostic

Troubleshooting: No position reading: Check 5VDC power supply, cable breakage or connector pin damage. FAULT LED lit: Low signal amplitude, contamination on grating disc or coupling misalignment. Position tracking error: Electrical noise interference, internal optical component aging or improper mounting gap.

Product Brief

Brief description: ERN1387.001-20 is HEIDENHAIN incremental rotary encoder with 2048 lines and 1Vpp output plus commutation signals,provides servo motor rotor position and speed feedback for heavy CNC boring mill closed-loop axis control,motor rotary encoder spare.