HEIDENHAIN ERN1387 Incremental Rotary Encoder

Technical Specifications

Model：ERN1387 Brand：HEIDENHAIN Product Type: Bearing-integrated incremental optical rotary encoder with stator anti-rotation coupling

Module Feature

Function: HEIDENHAIN ERN1387 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, fitted with M10 and M6 withdrawal thread for convenient disassembly. Integrated stator anti-rotation coupling compensates axial installation tolerance up to ±0.5mm. Max mechanical rotational speed up to 15000 rpm, operating temperature range -40℃ ~ +120℃. Widely used on elevator traction drives, 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, M10/M6 back-off thread Onboard components: Optical grating disc, scanning assembly, built-in bearing, stator coupling, 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, integrated stator anti-rotation coupling 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: ERN1387 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: ERN1387 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. Integrated stator coupling absorbs axial installation offset and protects internal bearing from mechanical stress. 1:10 taper shaft and expanding ring locking structure ensures reliable torque transmission. Withdrawal thread simplifies encoder removal from motor rotor during maintenance. Compact metal housing withstands cutting fluid, dust and workshop vibration. It is core measuring spare for heavy CNC boring mill and elevator traction 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 clamping ring. Fix stator coupling to prevent housing rotation. 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 ERN1387.

Diagnostic

Troubleshooting: No measuring signal: Check 5V power supply, cable breakage or connector pin contact. Weak or distorted signal: Optical window contamination or shaft misalignment. Intermittent signal fluctuation: Vibration, loose taper clamping ring or bearing deterioration.

Product Brief

Brief description: ERN1387 HEIDENHAIN bearing-integrated incremental rotary encoder with integrated stator coupling,1:10 tapered shaft,M10/M6 back-off thread,2048 lines and ~1.05Vpp sine/cosine output,used for elevator traction motor and spindle angular position and speed measurement of heavy CNC boring mill,rotary encoder spare.